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Project Documentation Document DL-SPEC-0002 Revision B Diffraction-Limited Near-IR Spectropolarimeter Design Requirements Document Haosheng Lin, Pei Huang, Helen McGregor, Garry Nitta, Peter Onaka, and Hubert Yamada Institute for Astronomy, University of Hawaii March 12, 2013 Advanced Technology Solar Telescope 950 N. Cherry Avenue Phone 520-318-8102 [email protected] http://atst.nso.edu Tucson, AZ 85719 Fax 520-318-8500 DL-NIRSP DRD REVISION SUMMARY: Date: 3/12/2013 Revision: B Creation of CDP working document from PDR version Date: 6/10/11 8:49 PM Revision: A Changes: PDR version DL-SPEC-0002, Revision A Page 2 of 41 DL-NIRSP DRD Table of Contents 1 REQUIREMENTS OVERVIEW .......................................................... 5 1.1 SCOPE OF THE DOCUMENT .............................................................................. 5 1.2 RELATED DOCUMENTS ..................................................................................... 5 1.2.1 RELATED ATST PROJECT DOCUMENTS ................................................................... 5 1.2.2 INTERFACE CONTROL DOCUMENTS AND DRAWINGS .................................................. 5 1.3 SPECIFIC DEFINITIONS AND TERMINOLOGY .................................................. 6 2 INSTRUMENT DESCRIPTION ........................................................... 7 2.1 SYSTEM OVERVIEW ........................................................................................... 7 2.2 CAMERA SYSTEMS............................................................................................. 7 2.3 MODE OF OPERATION ....................................................................................... 7 2.4 FEED OPTICS ...................................................................................................... 7 2.4.1 FEED OPTICS MODE OF OPERATION ......................................................................... 7 2.5 CONTEXT IMAGER .................................. ERROR! BOOKMARK NOT DEFINED. 2.6 FIBER-OPTIC INTEGRAL FIELD UNIT .... ERROR! BOOKMARK NOT DEFINED. 2.7 SPECTROPOLARIMETERS ................................................................................. 8 2.7.1 SPECTROGRAPH ..................................................................................................... 8 2.7.2 POLARIMETERS ...................................................................................................... 8 3 INSTRUMENT DESCRIPTION ........................................................... 9 3.1 INSTRUMENT SCIENCE REQUIREMENT DOCUMENT SPEC-0067 ................. 9 CONTEXT IMAGING, REGISTRATION AND GUIDING.............................................. 9 3.2 DL-NIRSP OPERATIONAL CONCEPTS DEFINITION (DL-NIRSP-SPEC-0001) .. ............................................................................................................................ 10 3.3 INTERCONNECTS AND SERVICES SPECIFICATION DOCUMENT (SPEC0063) ............................................................................................................................ 10 3.4 SPARE POLICY (SPEC-0041) ........................................................................... 13 3.5 GENERAL SPECIFICATIONS FOR THE DESIGN AND FABRICATION OF ATST (SPEC-0070)....................................................................................................... 13 3.6 SOFTWARE AND CONTROLS REQUIREMENTS (SPEC-0005) ...................... 15 3.7 INSTRUMENT CONTROL SYSTEM SPECIFICATION DOCUMENT (SPEC0023) ............................................................................................................................ 16 4 DERIVED REQUIREMENTS & SPECIFICATIONS .......................... 17 4.1 4.1.1 4.1.2 4.1.3 OPTICAL SYSTEM ............................................................................................. 17 RMS WAVEFRONT ERROR < 70 NM ....................................................................... 17 LOCATION ............................................................................................................ 17 FEED OPTICS ....................................................................................................... 17 DL-SPEC-0002, Revision A Page 3 of 41 DL-NIRSP DRD 4.1.4 4.1.5 4.1.6 4.1.7 4.1.8 FIELD SCANNING MIRROR...................................................................................... 19 CONTEXT IMAGER ................................................................................................. 19 FIBER-OPTIC INTEGRAL FIELD UNIT ....................................................................... 20 SPECTROGRAPH ................................................................................................... 21 POLARIMETERS .................................................................................................... 22 4.2 CONTROL SYSTEM ........................................................................................... 24 4.2.1 GENERAL REQUIREMENTS ..................................................................................... 24 4.2.2 FUNCTION REQUIREMENTS .................................................................................... 26 4.2.3 SYSTEM ACTIONS ................................................................................................. 27 4.2.4 SYSTEM SETTING REQUIREMENTS.......................................................................... 29 4.2.5 DL-NIRSP SPECIFIC TO TELESCOPE INTERACTION REQUIREMENTS .......................... 29 4.2.6 SYSTEM MODES REQUIREMENTS ........................................................................... 30 4.2.7 MECHANISM CONTROL REQUIREMENTS .................................................................. 33 4.2.8 INTERFACE REQUIREMENTS ................................................................................... 35 4.2.9 SYSTEM PERFORMANCE REQUIREMENTS ................................................................ 35 4.2.10 MAINTAINABILITY REQUIREMENTS .......................................................................... 36 4.2.11 DOCUMENTATION REQUIREMENTS.......................................................................... 37 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 DATA HANDLING REQUIREMENTS ................................................................. 37 USAGE OF ATST DATA HANDLING SYSTEM ............................................................ 37 DATA VOLUME...................................................................................................... 38 DETAILED DISPLAY PLUG-IN .................................................................................. 38 DATA PROCESSING PLUG-INS ................................................................................ 38 METADATA ........................................................................................................... 39 4.4 CAMERA SYSTEM ............................................................................................. 39 5 GENERAL REQUIREMENTS .......................................................... 40 5.1 RELIABILITY ...................................................................................................... 40 5.2 MAINTAINABILITY ............................................................................................. 40 5.3 COMMONALITY OF DESIGNS .......................................................................... 40 5.4 CONDITIONS OF USE........................................................................................ 40 5.5 FACILITY SERVICES INTERFACE .................................................................... 41 5.6 INTERFACES ..................................................................................................... 41 5.7 GENERAL DESIGN REQUIREMENTS .............................................................. 41 5.8 ELECTRICAL SYSTEM REQUIREMENTS ........................................................ 41 5.9 GENERAL FABRICATION REQUIREMENTS ................................................... 41 5.10 SPARES.............................................................................................................. 41 5.11 ENVIRONMENTAL REQUIREMENTS ............................................................... 41 DL-SPEC-0002, Revision A Page 4 of 41 DL-NIRSP DRD REQUIREMENTS OVERVIEW 1 1.1 Scope of the Document This document flows down the Instrument Science Requirements document into detailed design requirements to facilitate the final design of the instrument. 1.2 Related Documents SPEC-0001 - ATST Science Requirements Document SPEC-0067 - Instrument Science Requirements Document 1.2.1 Related ATST Project Documents SPEC-0012 - ATST Acronym List and Glossary SPEC-0013 - Software Concepts Definitions SPEC-0014 - Software Design SPEC-0022 - Software Users’ Manual SPEC-0023 - ICS Specification SPEC-0036 - Operational Concepts Definition SPEC-0070 - ATST Standard Environmental Conditions ICD 1.1 / 3.1.3 Telescope Mount Assembly to Coudé Station 1.2.2 Interface Control Documents and Drawings ICD-1.3/3.4.1 TEOA to DL-NIRSP ICD-3.1.3/3.4.1 Coudé Station to DL-NIRSP ICD-3.1.4/3.4.1 ICS to DL-NIRSP ICD-3.4.1/3.6.1 DL-NIRSP to Camera System DL-SPEC-0002, Revision A Page 5 of 41 DL-NIRSP DRD 1.3 Specific Definitions and Terminology Acronym Meaning BS Beam Splitter DLCI DL-NIRSP Context Imager DLF DL-NIRSP Feed Optics DLSG DL-NIRSP Spectrograph DWDM Dense Wavelength Division and Multiplexing FM Fold Mirror FSM Field Scanning Mirror IFU Integral Field Unit FW Filter Wheel GT Grating Turret OAM Off-Axis Mirror OAP Off-Axis Parabola SM Spherical Mirror SMA Slit Mask Assembly SW Slit Wheel DL-SPEC-0002, Revision A Page 6 of 41 DL-NIRSP DRD 2 INSTRUMENT DESCRIPTION 2.1 System Overview The DL-NIRSP will be a true-imaging multi-wavelength, diffraction grating based spectropolarimeter designed for study of the static and dynamic properties of solar magnetism with high spatial, spectral, and temporal resolution over a 2D field of view, and simultaneously at up to three spectral lines between 500 and 2500 nm wavelength range. The instrument is consisted of four major subsystems, namely (1) the feed optics, (2) the high-resolution fiber-optic Integral Field Unit (IFU), (3) the coronal IFU, and (4) the spectropolarimeter. 2.2 Camera Systems The baseline IR camera system for the final design is based on the substrate-removed HAWAII-2RG-18 (H2RG) focal plane arrays (FPA) with 2500 nm cutoff. Two H2RG cameras are needed. An additional camera sensitive in the visible wavelength range, from 380 nm to 1,000 nm, is needed to cover the visible part of the spectrum. 2.3 Fiber-Optic Integral Field Unit DL-NIRSP will be equipped with two fiber-optic IFUs for true-imaging spectropolarimetry. 2.4 Mode of Operation DL-NIRSP will support two modes of operation: 1. True-imaging mode with fiber-optic integral field unit (IFU), and 2. Large-field mosaic mode using field scanning mirror to cover field larger than the unit IFU field. These two modes of operation will be supported without major change in the optical configuration of the whole system. 2.5 Feed Optics DL-NIRSP will be equipped with a dual-resolution/FOV feed optics system. The high-resolution feed provides a high-resolution image to the spectrograph but only with a limited FOV coverage. The medium resolution mode feed optics will provide an image with a large field of view at a medium resolution. 2.5.1 Feed Optics Mode of Operation The feed optics will be capable of providing light feed to either the input array of the high-resolution IFU or the coronal IFU at a separate physical location. DL-SPEC-0002, Revision A Page 7 of 41 DL-NIRSP DRD 2.6 Spectropolarimeters 2.6.1 Spectrograph The spectrograph is a diffraction-grating based spectrograph. It is consisted of 1) a multiple-slit, multiplewavelength high-resolution spectrograph, which disperses the incident sunlight into spectra, 2) a beamsplitting system which separates the output beam of the spectrograph into three wavelength ranges, and 3) three relay optical system that relay the spectral images provided by the beam-splitting system to their final focal plane. Wavelength-specific optics for the instrument is located within the relay optics systems. 2.6.1.1 Spectrograph Mode of Operation The spectrograph will be capable of accepting light feed from either the exit arrays of the high-resolution IFU or from the exit array of the coronal IFU at a separate physical location. 2.6.2 Polarimeters DL-NIRSP will be equipped with a broadband polarimeter. It consists of 1) a polarimeter, which performs the separation of the polarization state of the incident sunlight, and 2) a camera system to record the polarized spectra provided by the polarimeter and the spectrograph. For operation in the true-imaging mode using fiber-optic IFU, DL-NIRSP will utilize a single broadband polarimeter system upstream of the IFU provided by the facility. Alternatively a dedicated broadband polarimeter located immediately in front of the input array of the IFU can be used. DL-SPEC-0002, Revision A Page 8 of 41 DL-NIRSP DRD 3 INSTRUMENT DESCRIPTION This section is to address any requirements the overall assembly itself may have, that are not covered in the subassembly requirements in the following section. 3.1 Instrument Science Requirement Document SPEC-0067 Reference Description Requirement Goal Source (section) ISRD-1 ISRD-2 ISRD-3 Spectral Coverage Spectral Resolving Power Spatial Sampling Diffraction Limited 900nm - 2300nm 50,000 - 2x105 0.057 arcsec pixel size G: 0.029 arcsec/pixel 500nm-2500nm Science Science Science ISRD-4 Spatial Field of View 2 arcmin at 0.057 arcsec/pixel sampling Science ISRD-5 Multiple-Slit Capability Science 4.1.7.3 ISRD-6 True 2-D Imaging Spectropolarimetry Capability 8 slits (with 2048x2048 FPA) IFU with 2048 spatial sampling elements 3 arcmin2 at 0.029 arcsec/pixel sampling 10 slits Science 4.1.3.7, 4.1.6, 4.1.7.2 ISRD-7 ISRD-8 Polarimetric Accuracy Calibration Optics Polarimetric Accuracy Temporal, Spatial and Spectral Modulation Better than 5x10-4 Ic 5x10-4 Ic IFU with > 10,000 spatial sampling elements 5x10-5 5x10-5 Ic Science Science 4.1.8.4 4.1.8.3 Science 4.1.8 3 Science 4.1.7 Science 4.1.2 Science 4.1.2 Science 4.1.2 Science 4.1.2 ISRD-15 Multi-Wavelength simultaneous Observations Simultaneous Operation with the Visible Polarimeter Simultaneous Operation with the Visible Tunable Filter Simultaneous Operation with the Visible Broadband Imager Simultaneous Operation with the AO System Slit Width <10 sec wavelength change 5 Science 4.1.7.4 ISRD-16 Scanning Unit Science 4.1.4 ISRD-17 Context imaging, Registration and guiding 2 arcmin with a step size of /2D at 900 nm Context imager sampling at full resolution with partial field of view of the spectrograph and 4 selectable wavelengths between 900 nm and 2500 nm Science 4.1.5 ISRD-9 ISRD-10 ISRD-11 ISRD-12 ISRD-13 ISRD-14 DL-SPEC-0002, Revision A Dual beam with at least 10 Hz modulation Flexible setup to allow different configurations Flexible setup to allow different configurations Flexible setup to allow different configurations Simultaneous operation with the AO system /2D at 900 nm for diffraction limited sampling Slit width and step size 4 times oversampling 3 arcmin DRD section 4.1.1 4.1.7.5 4.1.3.2, 4.1.3.3, 4.1.3.4 4.1.3.4, 4.1.3.5 Page 9 of 41 DL-NIRSP DRD 3.2 DL-NIRSP Operational Concepts Definition (DL-NIRSP-SPEC-0001) Reference OCD-1 Description TBD Requirement Goal Source (section) DRD 3.3 Interconnects and Services Specification Document (SPEC-0063) Reference S63-1 Description Electrical S63-2 Electrical power S63-3 Electrical power S63-4 Electrical power S63-5 Electrical power S63-6 Electrical power S63-7 Electrical power S63-8 Electrical power S63-9 Electrical power S63-10 Electrical power S63-11 Electrical power S63-12 EMI S63-13 EMI S63-14 ESD immunity DL-SPEC-0002, Revision A Requirement Assembly designed to allow removal and restoration of power without requirements on other subsystems such as rebooting Must have overcurrent protection Fuses shall be easily accessible for replacement Shall have a main line circuit breaker/power switch Controlled light indicator for power status Shall comply with latest release of National Electrical Code All power and signal cables and leads shall be shielded, from low and high-frequency interference UPS and normal power shall not be installed in the same breaker panel A mechanical disconnect shall be provided wherever a power bus feeds a utility breaker panel All circuits and subpanels shall feed from the breaker panel using rigid and/or flex EMT conduit All circuits shall be wired directly or use 3-wire duplex and twist locks duplex outlets All subsystems shall minimize EMI in every part of the design Coudé lab electronic equipment shall comply with FCC Reg. part 15, Class B (TBC) All electronic equip shall meet IEC 10004-2 Goal Source (section) Engineering DRD 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Page 10 of 41 DL-NIRSP DRD S63-15 RFI immunity S63-16 Power-line disturbances immunity S63-17 Electrical fast transient immunity S63-18 Surges immunity S63-19 Grounding S63-20 Grounding S63-21 Connectors S63-22 Connectors S63-23 Connectors S63-24 Connectors S63-25 Connectors S63-26 Connectors S63-27 Connectors S63-28 Connectors S63-29 Connectors S63-30 Connectors S63-31 Connectors S63-32 Connectors S63-33 Connectors DL-SPEC-0002, Revision A All electronic equip shall meet IEC 10004-3 and IEC 1000-4-6 All electronic equip shall meet IEC 10004-9 and IEC 1000-413 All electronic equip shall meet IEC 10004-4 All electronic equip shall meet IEC 10004-5 All electronic equip shall have Safety Grounds UPS outlets shall use orange colored 3-wire duplex outlets and shall be tied to GND2 (UPS ground) All electrical connectors, cabling, tubing provided shall be consistent with high reliability operation and EMC constraints Connectors shall be capable of being rapidly disconnected for servicing Connectors shall be sized so that they cannot be locally connected incorrectly Proper and appropriate strain relief shall be provided High quality roughservice connectors shall be used 120 V 3 pin 15A and 20A duplex sockets, Wall (white), Plug Strips (Black) 120V UPS – 3 pin 20A duplex sockets, All (orange) 208 V 3P – 3 prong 30A, twist lock (Black) MS (threaded) connectors used for power MS (bayonet) connectors used for control connections Back shells and cable clamps with strain relief boots shall be used Connectors shall be spaced 2X shell diameter One side of the connectors shall be ridged and the other side flexible Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Page 11 of 41 DL-NIRSP DRD S63-34 Connectors S63-35 Connectors S63-36 Connectors S63-37 Connectors S63-38 Cables S63-39 Cables S63-40 Cables S63-41 Cables S63-42 Cables S63-43 Racks S63-44 Thermal Design S63-45 Thermal Design S63-46 Thermal Design S63-47 Thermal Design S63-48 Reliability and Lifetime S63-49 Reliability and Lifetime DL-SPEC-0002, Revision A All connections shall be mounted such that they are physically accessible Connector spacing must be such that a gloved hand can install and remove it Connectors shall be unique to avoid improper connection during maintenance Keyed pin/socket groups must be approved by AURA If possible power and signal wires shall be routed separately Ground loops shall be avoided Strain reliefs at all disconnects and end points All power and signal cables shall be clearly and permanently labeled at both terminations The labeling system shall be easily traceable through the system schematics All electronic racks containing heat generating equipment, unless otherwise approved by AURA, shall be Liebert XDTM System water-based cooled racks (TBC) Components shall not dissipate more than 20W to the environment Insulation shall be of a non-deteriorating type, modular and easily removable and replaceable Where overheating can occur, thermal sensors shall be secured within the insulation and monitored as a status signal to the LIC and a local control system All equipment that is cooled shall be designed such that there is no condensation All systems shall be designed to exceed 50 (TBC) year lifetime Due consideration of fatigue shall be given to the components subject to stress Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Page 12 of 41 DL-NIRSP DRD S63-50 Reliability and Lifetime S63-51 Reliability and Lifetime S63-52 Reliability and Lifetime S63-53 Reliability and Lifetime S63-54 Reliability and Lifetime S63-55 Maintenance S63-56 Maintenance S63-57 Maintenance S63-58 Maintenance S63-59 Maintenance S63-60 Maintenance fluctuations All items not designed to exceed 50 years (TBC)shall be identified and approved by AURA Total non-scheduled down time shall not exceed two days per year MTBF>9,000 hours (TBC) Friction and wear components shall be easily replaced Servicing instructions shall include inspections of friction and wear components to evaluate conditions on a periodic basis All systems shall be configured such that maintenance can be carried out without hazard Weekly inspections and simple interventions shall take less than 6 hours per week Six-monthly activities shall take less than 24 hours total All maintenance procedures shall be approved by AURA All routine servicing shall be specified and provided with final documentation All routine inspections, servicing and general maintenance shall be accomplished by two trained observatory staff members with a minimum of special tooling Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Engineering 5.5 Source (section) Engineering DRD 5.10 3.4 Spare Policy (SPEC-0041) Reference S41-1 Description Spares Requirement Spare parts will be provided Goal ~10% 3.5 General Specifications for the Design and Fabrication of ATST (SPEC-0070) Reference S70-1 S70-2 Description General General S70-3 General DL-SPEC-0002, Revision A Requirement Part count to be minimized as much as possible Performance and functionality to be obtained through elegance of design Preference for off-the-shelf components Source (section) Engineering Engineering DRD 5.9 5.9 Engineering 5.9 Page 13 of 41 DL-NIRSP DRD S70-4 General S70-5 General S70-6 General S70-7 General S70-8 General S70-9 S70-10 Drawings Drawings S70-11 Design analysis S70-12 Drawings S70-13 Maintenance S70-14 Maintenance S70-15 Fabrication S70-16 Fabrication S70-17 Fabrication S70-18 Fabrication S70-19 Fabrication S70-20 Fabrication S70-21 Fabrication S70-22 Fabrication S70-23 S70-24 Fabrication Bolts and Hardware S70-25 Bolts and Hardware S70-26 Bolts and Hardware (Quality Control?) Bolts and Hardware Bolts and Hardware Bolts and Hardware Bolts and Hardware Bolts and Hardware S70-27 S70-28 S70-29 S70-30 S70-31 S70-32 S70-33 Surface Finish, Coatings and Paint Surface Finish, DL-SPEC-0002, Revision A Design using efficient and effective manufacturing processes Modular design approach to aid in mounting/disassembling servicing Parts needing alignments mounted with adjustment screws and locking mechanisms Written instructions for assembly, disassembly, servicing, and alignment Alignment and calibration tools (incl. software) to be provided to the customer Shall conform to AMSE Y14.5M-1982 Shall be in SI units with Imperial units shown in parentheses Shall be performed in SI units with Imperial units shown in parentheses Shall be provided in the latest version of SolidWorks (2D and 3D) Routine servicing and general maintenance <8 hours for two trained observatory staff members All special tools and equipment required for set-up, maintenance and servicing is required throughout the design lifetime All materials shall be new and of high grade commercial quality Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering Engineering 5.9 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 All materials shall be sound and free of defects (NonDestructive Inspection?) Material certification required for all major structural components Workmanship shall be of high grade of commercial practice and adequate to achieve the accuracies and surface finishes called for on all drawings and in the specifications All manufacturing processes shall be specified and followed All metal edges shall be free of burrs and sharp corners Materials used shall be consistent with all requirements, incl. life cycle ,reliability and maintainability Material substitution requires written approval from AURA Traceability of materials All bots, nuts, screws and other fasteners shall conform to appropriate ANSI or AISC standards, unless otherwise specified by AURA All bots, nuts, screws and other fasteners shall be installed in an approved method, specified in the standards Close tolerance bolts and their washer faced nuts shall be manufactured to approved dimensions Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering Engineering 5.9 5.9 Engineering 5.9 Engineering 5.9 Only new bolts, washers, nuts and other fastening hardware shall be used Procurement and installation of bolts per specification Engineering 5.9 Engineering 5.9 Specification shall conform to an appropriate standard Engineering 5.9 All bolts shall be properly lubricated at the time of installation Dimensions and washer requirements for oversize, short slotted and long slotted holes, shall conform to an appropriate high strength bolting specification All exposed machined surfaces shall have a surface finish of 64-microinches or better Engineering 5.9 Engineering 5.9 Engineering 5.9 Surface finishes have to be approved by AURA Engineering 5.9 Page 14 of 41 DL-NIRSP DRD S70-34 S70-35 S70-36 S70-37 S70-38 S70-39 S70-40 S70-41 S70-42 S70-43 S70-44 Coatings and Paint Surface Finish, Coatings and Paint Surface Finish, Coatings and Paint Surface Finish, Coatings and Paint Safety Metrology, Inspection Metrology, Inspection Packing and Shipping Packing and Shipping Packing and Shipping Packing and Shipping Packing and Shipping S70-45 Packing and Shipping S70-46 Packing and Shipping Site Assembly and Installation Environmental Conditions S70-47 S70-48 S70-49 S70-50 S70-51 Environmental Conditions Environmental Conditions Environmental Conditions These finishes shall not adversely affect the functioning of the telescope, nor require additional maintenance during the life of the telescope All protective coatings shall be of high quality and long life Engineering 5.9 Engineering 5.9 All metallic surfaces, other than mating machined surfaces, shall be painted or otherwise permanently protected against atmospheric corrosion Shall conform to ATST SPEC-0086 and associated documents (SPEC-0060, SPEC-0031, SPEC-0030, SPEC-0035) All equipment and standards shall be calibrated and traceable to established standards Final deliverable cables and hoses shall be used in all acceptance testing All materials and equipment for shipment shall protect them to damage in transit and storage Bearing surfaces and other exposed critical surfaces shall be particularly protected to avoid damage Electrical and electronic components shall be packed with a dehumidifying agent All parts shall be properly identified Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 All packaging, packing materials, slinging, and handling equipment design shall be approved for use by AURA The instrument shall be disassembled into a minimum number of parts and subassemblies after completion of acceptance testing Parts and subassemblies shall be packaged in approved shipping containers Components shall be designed for a straight-forward handling and installation at the Site The instrument shall be designed to function properly under the environmental conditions defined in SPEC0070 (daytime hours) The instrument shall be designed to survive the Site Survival Conditions defined in SPEC-0070 All components shall be vented to prevent damage or failure when going from sea level to the observatory site Any equipment and motors designed to operate at normal atmospheric air pressures and incorporating air cooling shall be de-rated Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Engineering 5.9 Note: all these specifications seem to apply to the telescope more than to the instrument. Confirm requirements 3.6 Software and Controls Requirements (SPEC-0005) Reference Description Requirement S05/0600X Documentation Source code, revisions, and operator documents DL-SPEC-0002, Revision A Source (section) DRD section Error! Reference source not found. Error! Reference source not found. Page 15 of 41 DL-NIRSP DRD S05/0700X S05/0800X Security Safety Unauthorized access is not allowed Cannot interfere with safety systems, interlock S05/09006 Simulation Control system must support simulation TBD Error! Reference source not found. TBD S05/1 S05/1 S05/1 S05/1 S05/1 S05/1 3.7 Instrument Control System Specification Document (SPEC-0023) Reference Description S23/3.1.40005 S23/3.1.40006 Instrument Management S23/3.1.40010 Best Software Practices S23/3.1.40015 S23/3.1.40025 Control S23/3.1.40030 Logging S23/3.1.40030 Availability S23/3.1.40040 Persistence of Data Requirement DL-SPEC-0002, Revision A DRD section TBD Error! Reference source not found. Error! Reference source not found. Error! Reference source not found. TBD Standard Software Components Health Source (section) Determine and report health every 3 seconds Static info required for operation shall be recoverable Error! Reference source not found. Error! Reference source not found. Error! Reference source not found. Error! Reference source not found. Page 16 of 41 DL-NIRSP DRD Default State S23/3.1.40060 Restart S23/3.1.40100 S23/3.1.40110 S23/3.1.40120 S23/3.1.41000 Control of instruments in an observation Facility instruments and science capabilities Coordinated Observations S23/3.1.41010 Command Response Time S23/3.1.41020 Boot Time Control system shall become available within 5 min after boot S23/3.1.41040 Computer Resources Shall not consume more than 50% CPU resources S23/3.1.41210 Common Services Framework Control system will be built using CSF S23/3.1.41250 S23/3.1.41300 S23/3.1.41305 Traceability Error! Reference source not found. Error! Reference source not found. Error! Reference source not found. Error! Reference source not found. Error! Reference source not found. TBD Engineering User Interface TBD Time Standard TBD Time to Accept or Reject Command DL-SPEC-0002, Revision A Control system must have a default state Error! Reference source not found. Error! Reference source not found. TBD S23/3.1.40050 TDB TBD Accept or reject commands in 0.1s Page 17 of 41 DL-NIRSP DRD 4 DERIVED REQUIREMENTS & SPECIFICATIONS Derived requirements flow down from the top-level requirements given in section 3, application of requirements for safety, and common engineering practices and through the DL-NIRSP design given in the DL-NIRSP Preliminary Design Document, SPEC-00xx. 4.1 Optical System 4.1.1 RMS Wavefront Error < 70 nm To achieve diffraction-limited performance at 900 nm, the RMS wavefront error of the system cannot be greater than 70 nm. Verification: Test Requirement Origin: DL-NIRSP ISRD-3 4.1.2 Location The DL-NIRSP shall be located in the coudé station optically behind the Adaptive Optics System to take advantage of its wavefront correction. It shall also be located behind the facility beamsplitter train that feeds the other facility instrument; enabling it to be operated simultaneously with the Visible Broadband Imager (VBI), the Visible Spectropolarimeter (ViSP), and the Visible Tunable Filter (VTF). Verification: Design Requirement Origin: DL-NIRSP ISRD-14 4.1.3 Feed Optics 4.1.3.1 All Reflecting Optics DL-NIRSP will observe spectral lines spanning a broad wavelength range, from 900 nm to 2500 nm, with a goal of 600 nm to 2500 nm. To achieve this broad wavelength coverage without compromise in image quality and system efficiency, while maintaining a common focal plane for the entire wavelength range, an all-reflecting optical design is required. Verification: Design Requirement Origin: DL-NIRSP ISRD-1, Engineering 4.1.3.2 Dual Resolution/FOV Feed Optics DL-NIRSP will support science observations with diverse requirement for spatial resolution and field of view coverage. However, it should be noted that the diffraction-limited spatial resolution (ISRD-3) and the 2-arcmin field of view (ISRD-4) requirements cannot be met simultaneously with current technology, nor is it necessary to achieve the science objectives of the instrument. Meeting these two requirements simultaneously requires the use of 8,096 x 8,096 format camera, which is not considered feasible by the Project. It also places extremely demanding, if not outright impossible requirements on the optical design. DL-SPEC-0002, Revision A Page 18 of 41 DL-NIRSP DRD A flexible feed optical system that allows for rapid switching between a high spatial resolution configuration and a large field of view configuration will meet all the science objectives of the instrument. Verification: Test Requirement Origin: DL-NIRSP ISRD-3, 4, Engineering 4.1.3.3 High-Resolution F/63 Mode The F/# (and therefore the plate scale) of the feed optics is uniquely determined by three parameters, namely: 1) the aperture of the telescope (4 m), 2) the spatial resolution requirement (diffraction-limited at 900 nm), and 3) the spatial sampling size of the instrument. The HAWAII-2RG-18 (H2RG-18) IR camera is designated as the baseline camera for the DL-NIRSP, with an upgrade path to the HAWAII-4RG-15 (H4RG-15), currently under development. For spectroscopic performance considerations (See TBD), the spectrograph will observe the solar features with a spatial sampling size equal to the size of two camera pixels, or 36 (30) µm using the HAWAII-2RG-18 (HAWAII-4RG-15) camera. To achieve diffractionlimited resolution at 900 nm, the spatial sampling size should be equal to or less than ½ the Airy disk size of the 4 m aperture of the ATST, or 0.0283”. A F/63 feed optics will yield a spatial sampling size of 0.029” for the H2RG-18 camera, equal to (1.04) the 2X critical sampling size. Verification: Test Requirement Origin: DL-NIRSP ISRD-3, Engineering 4.1.3.4 F/63 Feed Optics Resolution: Diffraction-Limited at 900 nm DL-NIRSP will perform diffraction-limited observation using the F/63 feed optics system. The optical performance needs to be equal to or better than diffraction-limited at 900 nm. Verification: Test Requirement Origin: DL-NIRSP ISRD-3 4, Engineering 4.1.3.5 Large-FOV F/24 Feed Mode A F/24 feed optics will yield a field of view of 2 arcmin for the H4RG-15 camera. For the baseline H2RG-18 camera, the field of view is 80”. DL-NIRSP will be equipped with a field scanning mirror (DLF-OAM2) to perform 2 x 2 mosaic to obtain 160” x 160” (2.7’ x 2.7’) FOV. The field of view of the instrument when H4RG-15 detector upgrade is implemented will be 120” x 120” (2’ x 2’) without mosaic, meeting the 2’ x 2’ FOV requirement. Verification: Test Requirement Origin: DL-NIRSP ISRD-4, Engineering 4.1.3.6 F/24 Feed Optics Resolution: Diffraction-Limited at 2500 nm In F/24 mode, the 36 µm slit samples a 0.08”-wide slice of the Sun. This is equivalent to the critical sampling size of 0.16”, or the diffraction limit of the ATST at 2500 nm. Verification: Test Requirement Origin: DL-NIRSP ISRD-3 4, Engineering DL-SPEC-0002, Revision A Page 19 of 41 DL-NIRSP DRD 4.1.3.7 Flexible Feed Optics Focal Plane Location DL-NIRSP will operate in either the conventional scanning long-slit spectrograph mode or the trueimaging fiber-optic IFU mode. The baseline fiber-optic IFU will be constructed with conventional flexible fused-silica optical fiber. This construction allows for the input array of the IFU to be placed at a convenient location different from the focal plane of the slit mask assembly of the spectrograph when operating in the long slit mode. The feed optics shall have the capability to place the focal plane at either the location of the IFU, or at the slit mask of the spectrograph without physically moving the spectrograph. Verification: Test Requirement Origin: DL-NIRSP ISRD-6, engineering 4.1.4 Field Scanning Mirror The requirements for the field-scanning mirror are summarized in the following table. Rationales and derivations of the requirements are documented in the DL-NIRSP Preliminary Design Document. Repeatability Accuracy Minimum Step size Maximum range of motion Rotation-to-Translation Crosstalk Time to Next Position Minimum speed Run-out REQUIREMENTS 0.3 rad (0.06”) 0.3 rad (0.06”) 3 rad (0.6”) 7.3 × 205 × 7 = 10,475 rad (0.6 deg) < 50 m < 100 ms > 1.7 deg/s < 0.3 rad (0.06”) Verification: Test Requirement Origin: DL-NIRSP ISRD-16, Preliminary Design 4.1.5 Context Imager 4.1.5.1 Context Imager: All-Reflective Optical Design The context imager is required to observe over a broad wavelength range from 900 to 2500 nm. Diffraction-limited resolution is required over one-half of the field of view of the spectrograph. To achieve this broad wavelength coverage without compromise in image quality and system efficiency, while maintaining a common focal plane for all the wavelengths to eliminate the need of a high-speed focus mechanism, an all-reflecting optical design is required. Verification: Test Requirement Origin: DL-NIRSP ISRD-17, Engineering DL-SPEC-0002, Revision A Page 20 of 41 DL-NIRSP DRD 4.1.5.2 Context Imager High-Speed Filter Wheel Assembly: 5-position filter wheel. For ground-based observation, differential atmospheric refraction results in small shift of images at different wavelengths. For proper alignment of DL-NIRSP images, it requires at least pseudosimultaneous context images spanning over the design wavelength range of the instrument for each Stokes observation to directly measure the image shifts at the observing wavelength. A 5-position filter wheel will provide coverage at four wavelengths plus a dark field. Verification: Test Requirement Origin: DL-NIRSP ISRD-17 4.1.5.3 Context Imager Camera Wavelength Range: 500 nm to 2500 nm Observations over the entire instrument wavelength range are required. Verification: Test Requirement Origin: DL-NIRSP ISRD-17 4.1.5.4 Context Imager Camera Pixel Format Observations covering only a fraction of the instrument field of view will be sufficient for image registration purpose. A camera with approximately ½ the pixel format of the instrument science camera will be identified for use with the context imager. Verification: Test Requirement Origin: DL-NIRSP ISRD-17 4.1.6 Fiber-Optic Integral Field Unit Two distinctive classes of science cases require true-imaging spectropolarimetric capability, namely 1) study of small-scale surface magnetism with short dynamic time scale, and 2) coronal magnetometry which requires very long integration time, even for low-spatial-resolution observation, to achieve the polarization sensitivity required for the detection of the weak coronal magnetic field signals. However, these two classes of observation have very different spatial sampling requirements. The fiber-optic IFU for Phase I of the DL-NIRSP project will be optimized for low spatial and spectral resolution coronal magnetometry observations. 4.1.6.1 Fiber-Optic IFU Spatial Sampling Resolution: 1” The fiber-Optic IFU will sample the field with 1" resolution, optimized for low spatial resolution coronal magnetometry observations. Verification: Test Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design 4.1.6.2 Fiber-Optic IFU Field of View Coverage: 1 arcmin The fiber-optic IFU will cover a field of 1' x 1', limited by the H2RG-18 camera, and the maximum packing ratio of the fiber-optic array. Verification: Test Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design DL-SPEC-0002, Revision A Page 21 of 41 DL-NIRSP DRD 4.1.6.3 Microlens Array Coupled Fiber-Optic IFU Input Array A microlens array will be coupled to the input array of the fiber-optic IFU for high efficiency between the telescope system and the fiber-optic IFU. Verification: Test Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design 4.1.6.4 Multiple-Slit Fiber-Optic IFU Exit Array The fiber-optic IFU for DL-NIRSP will be equipped with multiple parallel exit arrays to maximize the utilization of available pixels of the camera systems. Verification: Test Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design 4.1.7 Spectrograph 4.1.7.1 All-Reflective Optical Design DL-NIRSP will simultaneously observe spectral lines spanning a broad wavelength range, from 900 nm to 2500 nm, with a goal of 600 nm to 2500 nm. To achieve this broad wavelength coverage without compromise in image quality and system efficiency, while maintaining a common entrance slit location for the entire wavelength range, an all-reflecting optical design is required. Verification: Test Requirement Origin: DL-NIRSP ISRD-1, 10, Preliminary Design 4.1.7.2 Flexible Entrance Location DL-NIRSP will operate in either the conventional scanning long-slit spectrograph mode or the trueimaging fiber-optic IFU mode. The fiber-optic IFU will be constructed with conventional flexible fusedsilica optical fiber. This construction allows for the exit array of the IFU to be placed at a convenient location different from the entrance slit of the spectrograph when operating in the long slit mode. The spectrograph optical system shall have the capability to accept light from the exit array of fiber-optic IFU, or from the entrance slit of the spectrograph in the conventional scanning long-slit mode without physically moving the spectrograph. Verification: Test Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design 4.1.7.3 Multiple-Slit Capability Multiple-slit capability will be provided by a set of slit masks constructed from etched slits on reflecting surfaces coated on precision window substrates using photolithography processes. The number of slits and separation between adjacent slits will be optimized for science goals and bandwidth of bandpass isolation filters. Verification: Test Requirement Origin: DL-NIRSP ISRD-5 DL-SPEC-0002, Revision A Page 22 of 41 DL-NIRSP DRD 4.1.7.4 4-Position Slit Mask Wheel To accommodate the broad science goals of the DL-NIRSP, and to allow for spectral flatfielding utilizing facility flatfield calibration lamps, multiple-slit masks with assorted slit widths are required. A motorized 4-position slit mask wheel will allow quick change of the slit masks. The slit width for science observation will at least 2X oversamples the diffraction spot size of the ATST at 900 nm. Verification: Test Requirement Origin: DL-NIRSP ISRD-5, Preliminary Design 4.1.7.5 3-Position Grating Turret In order to meet the large spectral resolution requirements (from R ~ 50,000 to 200,000), the spectrograph will be equipped with a 3-slot grating turret to accommodate gratings with different blaze angle. Verification: Test Requirement Origin: DL-NIRSP ISRD-2, Preliminary Design 4.1.7.6 Spectrograph: Dichroic Beam Splitter System A beam-splitting system consisting of a series of three dichroic beam splitters, and a final fold mirror, will split the exit beam of the spectrograph into four wavelength bands. Verification: Test Requirement Origin: DL-NIRSP ISRD-1, 10, Preliminary Design 4.1.7.7 Spectrograph: Relay Optics System Four relay optical systems will relay the four exit beams provided by the beam-splitter system to four final focal planes. The relay optics will have identical prescriptions except for anti-reflection coating optimized for each wavelength band. Verification: Test Requirement Origin: DL-NIRSP ISRD-1, 10, Preliminary Design 4.1.8 Polarimeters 4.1.8.1 High-Speed Wavelength-Specific Polarization Modulation Units DL-NIRSP will be equipped with four high-speed SWIFT Liquid Crystal Variable Retarder (LCVR)based Polarization modulators in the four relay arms, each optimized for the wavelength range of the relay arm, for observation in the multiple long-slit mode. Verification: Test Requirement Origin: DL-NIRSP ISRD-7, Engineering DL-SPEC-0002, Revision A Page 23 of 41 DL-NIRSP DRD 4.1.8.2 Broadband Polarization Modulation Unit The baseline fiber optics IFU will be constructed with conventional, non-polarization-maintenance multimode fibers. Polarization analysis will needs to be performed upstream of the fibers. DL-NIRSP will be capable of utilizing the facility broadband polarization modulator located at the Gregorian Optical Station (GOS) of the telescope for observation in the fiber optics IFU mode. Verification: Test Requirement Origin: DL-NIRSP ISRD-7, Engineering 4.1.8.3 Polarization Calibration Optics DL-NIRSP shall be able to utilize the facility GOS polarization calibration optics to perform instrumental polarization crosstalk calibration. Verification: Test Requirement Origin: DL-NIRSP ISRD-7, Engineering 4.1.8.4 Polarization Accuracy DL-NIRSP shall utilize the cross correlation telescope polarization calibration method to calibrate and correct for the end-to-end polarization crosstalk of the instrument. This is the baseline polarization crosstalk calibration method for the ATST, currently under development with close collaboration between the DL-NIRSP instrument team and the ATST instrument scientist, and expected to achieve 5 x 10 -4 polarization accuracy. Verification: Test Requirement Origin: DL-NIRSP ISRD-7, Engineering 4.1.8.5 Simultaneous observation of two orthogonal polarization states DL-NIRSP will be equipped with four Wollaston polarizing beam splitter in the four relay arms for dual beam polarimetry when operating in the multiple long-slit mode. Additionally, a Wollaston polarizing beam splitter will be located in front of the input array of the fiberoptic IFU for observation in the true-imaging mode. Verification: Test Requirement Origin: DL-NIRSP ISRD-9, Engineering DL-SPEC-0002, Revision A Page 24 of 41 DL-NIRSP DRD 4.1.8.6 Cameras 4.1.8.6.1 Camera 1 & 2 Camera 1 Wavelength Range Format Pixel Size % Pixel Operability Frame Rate Quantum Efficiency Full-Well Capacity Read Noise 400 nm - 1,000 nm 2048 x 2048 0.018 mm > 95 % 78 FPS > 60% > 100,000 e30 e- Verification: Test Requirement Origin: DL-NIRSP ISRD-1, 2, 3, 4, 5, 6, 10 4.1.8.6.2 Camera 3 & 4 Camera 2 Wavelength Range Format Pixel Size % Pixel Operability Frame Rate Quantum Efficiency Full-Well Capacity Read Noise 400 nm - 2,500 nm 2048 x 2048 0.018 mm > 95 % 78 FPS > 60% > 100,000 e30 e- Verification: Test Requirement Origin: DL-NIRSP ISRD-1, 2, 3, 4, 5, 6, 10 4.2 Control System 4.2.1 General Requirements 4.2.1.1 Control Software Standards The DL-NIRSP CS shall conform to the software standards for ATST control systems. These standards are defined by the ATST Software Requirements (SPEC-0005), Software Operational Concepts (SPEC0013, and the Software Design (SPEC-0014). This requires that the DL-NIRSP CS shall use the ATST Common Services software framework (SPEC-0022). DL-SPEC-0002, Revision A Page 25 of 41 DL-NIRSP DRD The ATST Common Services framework specifies that software control systems use the ATST controller model, where the control system is comprised of a hierarchical set of controller components. These components use the ATST services (such as events, logging, and properties) to communicate with each other and with other parts of the ATST software system. Any deviation from the use of the framework should be justified, reviewed by the ATST software team, and well documented. Verification: Design Review, Test Source: Engineering (SPEC-0023) 4.2.1.2 Common Services Framework The DL-NIRSP CS shall use the ATST Common Services Framework for all communications on the Control LAN. Verification: Design Review 4.2.1.3 Instrument Controller (IC) The DL-NIRSP CS shall perform as the instrument controller for the DL-NIRSP. As an instrument controller, the DL-NIRSP CS shall follow all commands delivered from the ICS to control the DL-NIRSP and communicate required status information back to the ICS. The DL-NIRSP shall be constructed using the ICS framework as much as possible. This may include, but is not limited to, framework components such as the Instrument Sequencer, Motion Controller, Detector Controller, and Hardware Controller. Verification: Design Review Source: Engineering (SPEC-0023) 4.2.1.4 Control System The systems within the DL-NIRSP shall be controlled and monitored by the DL-NIRSP Control System. It shall be responsible for coordinating the activities that use the mechanical and detector subsystems. It shall directly control these subsystems, read their status, and provide direction as required. Verification: Design Review Source: Engineering (SPEC-0023) 4.2.1.5 Containers and Components The DL-NIRSP CS shall use container and components as described by the Software Concepts Definition (SPEC-0013) and defined in the CSF Users’ Manual (SPEC-0022-1). Verification: Design Review Source: Engineering (SPEC-0013) 4.2.1.6 Configuration Identifiers The DL-NIRSP CS shall use the proper configuration identifier in all communications. A configuration identifier is supplied to the DL-NIRSP CS for each and every configuration sent to it from the ICS. The DL-NIRSP CS shall use configuration identifiers to track actions throughout the DL-NIRSP CS. Verification: Design Review Source: Engineering (SPEC-0013) DL-SPEC-0002, Revision A Page 26 of 41 DL-NIRSP DRD 4.2.1.7 Time Standard The DL-NIRSP CS shall use UTC for reporting time in displays, logging, headers, status, events, and alarms. Verification: Design Review, Test Source: Engineering (SPEC-0013). 4.2.2 Function Requirements 4.2.2.1 Logging The DL-NIRSP CS shall log pertinent data to the ATST facility log mechanism. Pertinent data shall include, but not be limited to, state changes, configuration changes, errors, alarms and warnings, and any other information that may assist in reconstructing the operation of the DL-NIRSP CS. The DL-NIRSP CS logging level shall be user selectable for the depth of information. Verification: Design Review, Test Source: Engineering (SPEC-0023) 4.2.2.2 Default State The DL-NIRSP CS shall have a defined default state for all operations and control loops that it controls, including but not limited to: positioning of mechanical components, thermal control, and detector state. The default state of DL-NIRSP CS shall be that all mechanisms are in an inert, non-moving, but powered condition. The DL-NIRSP CS shall assume this default state after startup. Verification: Design Review, Test Source: Engineering (SPEC-0023) 4.2.2.3 Restart The DL-NIRSP CS shall perform all action requests sent through its public interface without need of reboot or re-initialization, unless the request demands such an operation. Verification: Design Review, Test Source: Engineering (SPEC-0023) 4.2.2.4 Health The DL-NIRSP CS shall be capable of determining its health and report that health through the Common Services Framework health mechanism. The DL-NIRSP CS shall be able to determine if it is performing within its operational specifications, and return a result of good, ill, or bad for DL-NIRSP CS health states that are operational, performing below specification, and not performing at all, respectively. The DLNIRSP CS health report shall include information on the particular DL-NIRSP CS systems that are performing below specification and the possible reason for the poor health. The DL-NIRSP CS shall determine and report the health at least every 3 seconds. Verification: Design Review, Test Source: Engineering (SPEC-0023) 4.2.2.5 Availability The DL-NIRSP CS shall always be available to accept or reject commands. It shall not block any command request while processing another command request. This requirement prevents the DL-NIRSP CS from processing a command in one thread, essentially blocking subsequent commands until the first one is completed. This behavior is necessary to perform DL-SPEC-0002, Revision A Page 27 of 41 DL-NIRSP DRD commands such as stop and pause after an initial start command; otherwise it would be difficult to stop an ongoing operation. Verification: Design Review, Test Source: Engineering (SPEC-0023) 4.2.2.6 Persistence of Data Static information required by the DL-NIRSP CS to operate shall be recoverable after a restart or reboot. This information may include, but is not limited to, default mechanical positions, named mechanical positions, and configuration parameters. Verification: Design Review, Test Source: Engineering (SPEC-0023) 4.2.2.7 Command/Action/Response directives The DL-NIRSP CS shall obey the ATST Common Services Framework command interface when issuing all commands to the DL-NIRSP CS subsystems. Verification: Design Review Source: Engineering (SPEC-0013) 4.2.2.8 Events The DL-NIRSP CS shall use the ATST Common Services event interface to send and receive asynchronous information between itself and the subsystems. Verification: Design Review Source: Engineering (SPEC-0013) 4.2.2.9 Sequencing The DL-NIRSP CS shall be responsible for maintaining any sequence or order of command execution for commands sent by the ICS. Commands from the ICS shall be executed in the order they are received or, if given with associated start times, in the order of the start times. All valid commands shall be queued by the DL-NIRSP CS for execution. Verification: Design Review, Test Source: Engineering (SPEC-0013) 4.2.2.10 Alarms The DL-NIRSP CS shall generate alarms for any errors or problems it detects that require operator notification or intervention. Alarms shall be generated for loss of control or contact with its subsystems or any mechanism end-of-travel. Verification: Design Review, Test Source: Engineering (SPEC-0013). 4.2.3 System Actions 4.2.3.1 Start The DL-NIRSP CS shall allow users of its public interface to command it to start performing the activities necessary to meet the specified configuration (i.e. mode and parameters). Verification: Design Review, Test Source: … DL-SPEC-0002, Revision A Page 28 of 41 DL-NIRSP DRD 4.2.3.2 Pause The DL-NIRSP CS shall allow users of its public interface to command it to pause the current action being performed. Idle – stays idle Motion – after motion is finished Data Collection – at end of frame set Engineering image computation / Property Update – pause before next image computation OR after property update is complete Verification: Design Review, Test Source: Engineering (OCD) 4.2.3.3 Resume The DL-NIRSP CS shall allow users of its public interface to command it to resume an action that had been paused. Idle – Remain idle Motion – Continue with next script action Data Collection – Continue with next script action Engineering Image Computation – Continue with next script action Verification: Design Review, Test Source: Engineering (OCD) 4.2.3.4 Cancel The DL-NIRSP CS shall allow users of its public interface to command it to cancel the current action being performed. Idle – Remain idle Motion – Finish current motion then terminate script Data Collection – Finish current frame set then terminate script Engineering image computation / Properties Update – Terminate script before next engineering image request OR after properties update Verification: Design Review, Test Source: Engineering (OCD) 4.2.3.5 Abort The DL-NIRSP CS shall allow users of its public interface to command it to abort the current action being performed. Idle – Remain idle Motion – Terminate current motion and exit script Data Collection – Terminate current data collection and exit script Engineering image computation / Properties Update – Terminate current computation or properties update Verification: Design Review, Test Source: Engineering (OCD) DL-SPEC-0002, Revision A Page 29 of 41 DL-NIRSP DRD 4.2.4 System Setting Requirements 4.2.4.1 Instrument parameters This section contains all requirements for the DL-NIRSP instrument settings. Setting Resolution Light source Slit mask Polarimeter Scan mode Scan step size Number of scans Number of scan steps Time interval between 2 steps Values / units Low, High IFU, beam 1,2,3,4 On, Off Continuous, dither Default ISRD #5 auto 1 to max allowable steps Integer or ‘free run mode’ auto auto (aka loops, maps, cycles) Tick marks for synchronization - Information is needed for timeout, observations and synchronization purposes - ‘free run mode’ = as fast as possible Wavelengths Number of measurements Exposure time Source requirement Additional explanation Milliseconds Co-add Camera spectral binning Camera spatial binning CI Camera spatial binning Instr. Polarimeter tuning parameters Facility Polarimeter initial position Facility Polarimeter increment step Number of exposures of one specific type of observation added together (i.e. one state of the modulator) to produce one single image (i.e. contains X frames to ‘coadd’). Binning in (X) direction Arm/ CI Arm/ CI Arm/ CI Arm/ CI Arm Binning in (Y) direction Arm Binning in (X,Y) direction CI Arm Arm Arm Table 1 - Instrument parameters. Verification: Design Review, Test 4.2.5 DL-NIRSP specific to telescope interaction requirements 4.2.5.1 Exposure Synchronization with the Polarimeter The polarimeter will be implemented within the DL-NIRSP instrument. Moreover, the DL-NIRSP instrument will also use the telescope polarimeter and therefore synchronization shall be defined in a future ICD. 4.2.5.2 Synchronization with the Occulting mechanism at M2 TBD DL-SPEC-0002, Revision A Page 30 of 41 DL-NIRSP DRD 4.2.6 System Modes Requirements Remark: The following paragraphs should be moved in the DL-NIRSP OCD. DL-NIRSP operations require N operational modes: “Morning Setup”: to be executed as turn-on procedure. It includes a special focus procedure to check if the telescope image is focused on the slit jaw. It requires a pre-defined setup of the context imager and its camera. Focus: to be executed as part of the setup mode each time a new wavelength is selected Setup: to be executed before each new observing program Observe: to start an observing program Dark: dark calibration Gain: flat field calibrations PolCal: polarimeter calibration. This mode can be executed with the facility polarimeter or the instrument polarimeter. Target: to be used for plate scale calibration and registration Any DL-NIRSP observing sequence shall be made of the following operational modes: Setup (inc. focus), Calibration, Observe. The calibration sequence shall be the following: Dark, Gain (solar and lamp), Instrument PolCal There is no distinction of where the light comes from. Hence, the same procedures apply for IFU and light beam. Night time calibrations may not needed. No absolute Photometry is required for DL-NIRSP. 4.2.6.1 System Configuration DL-NIRSP is a multi-wavelength spectropolarimeter that can observe up to four spectral lines simultaneously. For any given spectral line combination, a unique 'configuration file' containing all necessary information of the spectropolarimeter will be generated using Zemax optical modeling software. 4.2.6.2 Setup The DL-NIRSP shall allow users of its instrument GUI plug-in to setup the DL-NIRSP before starting any exposures. Any new observing program that requires a change of the current configuration of the instrument shall be preceded by a setup sequence followed by a calibration sequence. These setting shall remain in place until modified via another setup or by the engineering GUI plug-in. From this mode, the user shall also be able to test the configuration. The context imager shall have a fixed predefined sequence of observation that corresponds to four wavelengths for each spectrograph position. The following sequence describes the setup procedure and all associated opto-mechanical motions: Set the light source: o IFU: o move FM1 and FM6 out of the beam path o Beam: o move FM1 and FM6 in the beam path Set the resolution mode: o Low resolution: o insert FM5 and FM4 into the beam path DL-SPEC-0002, Revision A Page 31 of 41 DL-NIRSP DRD o High resolution: o move away FM5 and FM4 Set spectral resolution o Chose a slit mask o Select spectral lines combination o Move filter spectrograph filter wheel o o Compute grating angle (done by Instrument Scientist using Instrument Configurator) o Move the grating o Compute beam splitter angles (for each arm, by Instrument Scientist using Instrument Configurator) o Move beam splitters (for each arm) o Adjust the camera focus with RCoN stages (for each arms) Start test exposures 4.2.6.3 Focus The DL-NIRSP shall allow users of its instrument GUI plug-in to focus the DL-NIRSP. This mode can be executed independently but shall be included in the Setup mode (because the focus is wavelength dependant). This is a spectrograph mode only; there is no focus mode for the context imager. The following sequence describes the focus procedure and all associated opto-mechanical motions: Check spectral and spatial focus within the instrument: o Move (manually) RCoN stage for each arm until focus position is achieved 4.2.6.4 Observe The DL-NIRSP shall allow users of its instrument GUI plug-in to command the DL-NIRSP and perform observation activities using parameters setup in the Setup mode. The only moving mechanisms during any observing sequences shall be the scanning mirror stage and the context imager filter wheel. 4.2.6.5 Dark The DL-NIRSP shall allow users of its instrument GUI plug-in to perform dark flatfield activities. In this mode, a burst of exposures shall be collected. This mode will be used for both spectrograph and context imager sides. It requires a dark slit at the GOS or an external shutter. 4.2.6.6 Gain The DL-NIRSP shall allow users of its instrument GUI plug-in to perform flat field activities. In this mode, a burst of exposures shall be collected by both spectrograph and context imager sides. The scanning mirror is not involved in this position. 4.2.6.6.1 Solar flat field To perform this operation, the telescope shall be out of focus, and the AO system in an unflatten mode. The telescope shall be doing random pointing and does not require any synchronization with the DLNIRSP. DL-SPEC-0002, Revision A Page 32 of 41 DL-NIRSP DRD 4.2.6.6.2 Lamp flat field The mode shall require the activation of a lamp at the GOS. 4.2.6.6.3 Sky flat field The telescope shall be pointing the sky within its off-pointing capability. 4.2.6.7 Instrument PolCal The DL-NIRSP shall allow users of its instrument GUI plug-in to perform the instrumental polarization calibration using a calibration linear polarizer and 1/4-wave retarder located either within each spectrograph arm or at the GOS. The GOS calibration shall be performed as frequently as possible. The frequency shall be determined by the telescope scientist or the PI. The Instrument calibration frequency is TBD. The following settings are required. The default settings represent 1 set of observation of 36 measurements of 10º apart. The same procedure applies for both types of polarization calibration. Calibration Optics 1 is the linear polarizer. Calibration Optics 2 is the ¼-wave retarder. Linear Polarizer Calibration Optics 1: move into the beam path Calibration Optics 2: should be out of the beam path Initial position (default 0º). Increment per step (default 10º). Number of Measurements (default 36) Number of scan steps (default to 0 = no scanning). At the end of the sequence the following sequence shall be executed: Calibration Optics 1: move out of the beam path 1/4-wave retarder: Calibration Optics 1: move into the beam path Calibration Optics 2: move into the beam path Initial position (default 0º). Increment per step (default 10º). Number of Number of scan steps (default to 0 = no scanning). Number of scan steps (default to 0 = no scanning). At the end of the sequence the following sequence shall be executed: Calibration Optics 1: move out of the beam path Calibration Optics 2: move out of the beam path 4.2.6.8 Target The DL-NIRSP shall allow users of its instrument GUI plug-in to perform target observational activities. In this mode, the DL-NIRSP will act the same way than the Observe mode. Metadata information shall take into account this specific selected target. There will be different targets (e.g., Air Force resolution target, Line grid, dot grid) available. It is assumed that the target selection will be done at higher level. For this mode, DL-NIRSP shall only provide the capability to scan the target. The target depends on the instrument resolution mode. This mode shall be used for plate scale calibration and registration. The scanning mirror may be used during this mode. DL-SPEC-0002, Revision A Page 33 of 41 DL-NIRSP DRD 4.2.6.9 System Modes Requirements settings The following table summarizes the settings required for each observing mode. Table 2 - System modes settings. Setting Spectrograph Resolution Light source Slit mask Polarimeter Scan mode Scan step size Number of scans (aka loops, maps, cycles) Number of scan steps Time interval between 2 steps Wavelengths Number of measurements All arms Exposure time Co-add Camera spectral binning Camera spatial binning Context imager Wavelengths Exposure time Co-add Camera spectral binning Camera spatial binning Polarimetry Linear Polarimetry Initial position Increment Retarder Initial position Increment Tuning parameter Setup Gain Dark Polarimetry Target X X X X X X X X X ? X X ? X X X X X X X X X X X X X X X X X X X X X X X X X X X X Predefined Predefined Predefined Predefined Predefined X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Verification: Design Review, Test Source: DL-NIRSP OCD, OCD (SPEC-0036) 4.2.7 Mechanism Control Requirements 4.2.7.1 Position and monitor filter and slit wheels (Spectrograph and Context Imager) The DL-NIRSP CS shall control the position of filter and slit wheels used to position optical elements within the DL-NIRSP. The DL-NIRSP CS shall operate the filter and slit wheels within the required performance specifications of those components. The DL-NIRSP CS shall monitor the position of the filter and slit wheels within the specified tolerance. It shall report those positional values in a timely manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall report and log errors and faults when operational performance is not achieved. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) DL-SPEC-0002, Revision A Page 34 of 41 DL-NIRSP DRD 4.2.7.2 Position and monitor focus mirror stages (for each arm) The DL-NIRSP CS shall control the position of the focus stages used to position the focusing mirror within the DL-NIRSP. The DL-NIRSP CS shall operate the focus stages within the required performance specifications of those components. The DL-NIRSP CS shall monitor the position of the focus stages within the specified tolerance. It shall report those positional values in a timely manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall report and log errors and faults when operational performance is not achieved. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) 4.2.7.3 Position and monitor resolution mode and light source mirror stages The DL-NIRSP CS shall control the position of the resolution and light source mirror stages used to position their mirrors within the DL-NIRSP. The DL-NIRSP CS shall operate these mirror stages within the required performance specifications of this component. The DL-NIRSP CS shall monitor the position of these mirror stages within the specified tolerance. It shall report those positional values in a timely manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall report and log errors and faults when operational performance is not achieved. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) 4.2.7.4 Position and monitor grating turret stage The DL-NIRSP CS shall control the position of the grating turret stage used to position the grating turret within the DL-NIRSP. The DL-NIRSP CS shall operate the grating turret stage within the required performance specifications of this component. The DL-NIRSP CS shall monitor the position of the grating turret stage within the specified tolerance. It shall report those positional values in a timely manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall report and log errors and faults when operational performance is not achieved. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) 4.2.7.5 Position and monitor scanning mirror stage The DL-NIRSP CS shall control the position of the scanning mirror stage used to position the scanning mirror within the DL-NIRSP. The DL-NIRSP CS shall operate the scanning mirror stage within the required performance specifications of this component. The DL-NIRSP CS shall monitor the position of the scanning mirror stage within the specified tolerance. It shall report those positional values in a timely manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall report and log errors and faults when operational performance is not achieved. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) DL-SPEC-0002, Revision A Page 35 of 41 DL-NIRSP DRD 4.2.8 Interface Requirements 4.2.8.1 Instrument Control System The DL-NIRSP CS shall provide an interface to the Instrument Control System (ICS) as defined by ICD3.1.4/3.4.1. This interface shall allow the ICS to issue commands specifying attributes and actions the DL-NIRSP CS is to perform. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) 4.2.8.2 Instrument Setup Tab The DL-NIRSP shall have instrument setup tabs to be used in the OCS GUI that allows the setting of parameters for each mode of the DL-NIRSP. The setup tabs will be based upon the ATST Common Software Framework JES tool. The setup tabs shall be operable from computers other than the DL-NIRSP CS on the ATST control network. The setup tab will allow the user to save and load parameter sets from persistent storage. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) 4.2.8.3 Engineering User Interface The DL-NIRSP shall have an engineering user interface that implements all functional operations of the DL-NIRSP CS and will be based upon the ATST Common Software Framework JES tool. The engineering user interface shall be operable from computers other than the DL-NIRSP CS on the ATST control network. The engineering user interface shall use the interfaces defined by the ICS interface control document to perform all requested functionality. Verification: Design Review, Test Source: Engineering, Operational Requirement (OCD) 4.2.8.4 Simulation Control The DL-NIRSP CS shall support simulating functionality of its mechanical and hardware subcomponents. Verification: Design Review, Test Source: Engineering (SPEC-0005), DL-NIRSP OCD 4.2.9 System Performance Requirements 4.2.9.1 Computer Resources The DL-NIRSP CS shall consume no more than 50% of the host computer processing capability. The DLNIRSP CS shall not consume more than 50% of its allocated hard disk capacity. Verification: Test Source: Engineering (SPEC-0023) 4.2.9.2 Accept or Reject Commands The DL-NIRSP CS shall accept or reject a command given on its public interface within 0.1 seconds. Verification: Test Source: Engineering (SPEC-0023) DL-SPEC-0002, Revision A Page 36 of 41 DL-NIRSP DRD 4.2.9.3 Command Response Time The ICS shall execute an accepted command accepted on its public interface, transfer that command through the OMS, ICs, and Mechanism Controllers and, in the case of a null action, report the command's execution status back to the public interface within 0.1seconds. Verification: Test Source: Engineering (SPEC-00023) 4.2.9.4 Boot Time The DL-NIRSP CS shall be operational and ready to receive and act upon commands within 5 minutes of a cold, power-off start of its host computer hardware. Verification: Test Source: Engineering (SPEC-0023) 4.2.9.5 Computational Performance The DL-NIRSP CS shall complete computational routines efficiently as specified below: Focus – TBC Target – TBD Note: The performance requirements above only apply to the computations being performed by the DLNIRSP CS on delivered images. Verification: Design Review, Test Source: Operations (SPEC-0036, DL-NIRSP OCD) 4.2.10 Maintainability Requirements 4.2.10.1 Source Code The DL-NIRSP CS shall provide all source code written for the DL-NIRSP CS. Third party libraries or packages selected and used by the DL-NIRSP CS shall also be provided with source code. Any exemptions from this requirement shall be requested by the DL-NIRSP to the ATST project before proprietary source code is utilized by the DL-NIRSP CS. Verification: Design Review, Test Source: SPEC-0005 4.2.10.2 Source Documentation The DL-NIRSP CS shall document all source code in a manner consistent with good software practices. Specifically: A consistent syntactical style shall be used. Source files shall have a header containing version number, revisions, author(s), and functional description. Source functions or methods shall have a description of the interface and operation of the function. Major algorithms or operational sections of code shall be clearly commented. Verification: Design Review, Test Source: SPEC-0005 DL-SPEC-0002, Revision A Page 37 of 41 DL-NIRSP DRD 4.2.10.3 Revision Repository The DL-NIRSP CS shall use a revision repository (such as CVS) during construction. The repository shall be accessible by the ATST during construction. Verification: Design Review, Test Source: SPEC-0005 4.2.11 Documentation Requirements 4.2.11.1 Final Design The DL-NIRSP CS shall provide a final design document. This document shall include all details necessary to construct the DL-NIRSP CS. During construction, this document shall be updated to show any design modifications made during construction. Verification: Design Review Source: Engineering (SPEC-0005) 4.2.11.2 Public Interfaces The DL-NIRSP CS shall document all public software interfaces. Public software interfaces are used by the ICS, engineering interface, and the DL-NIRSP CS subsystems. Verification: Design Review, Inspection Source: Engineering (SPEC-0005) 4.2.11.3 Operator's Manual The DL-NIRSP CS shall provide an operator’s manual that describes the use of the DL-NIRSP CS by an ATST operator. The manual shall describe operation during normal observations, setup, troubleshooting, and engineering. Verification: Design Review, Inspection Source: Engineering (SPEC-0005) 4.3 Data Handling Requirements 4.3.1 Usage of ATST Data Handling System The DL-NIRSP shall use the ATST Data Handling System (DHS) to transport, process and store its acquired scientific data. Verification: Test Source: Operations (OCD) DL-SPEC-0002, Revision A Page 38 of 41 DL-NIRSP DRD 4.3.2 Data Volume 4.3.2.1 Maximum size data products Table 3- Estimated volume of data for the maximum speed avalaible Rows Columns Rate (Hz) Bytes/Pixel 2 Single Frame Size (MB) 8 Bandwidth (MB/s) 608 2048 2048 76 1024 1024 5 2 2 10 Comment No accumulated Spectrograph Camera - Context Imager Camera - Depending on camera - Depending on speed synchronization with spectrograph Verification: Review Source: Operations 4.3.2.2 Other size data products Table 4 - Estimated volume of data for a normal observing cadence Rows Columns Rate (Hz) Bytes/Pixel 4 Single Frame Size (MB) 16 Bandwidth (MB/s) 64 2048 2048 1 1024 1024 5 2 2 10 Comment Accumulated Spectrograph Camera Context Imager Camera Verification: Review Source: Operations (CN-SPEC-0001/OCD) 4.3.3 Detailed Display Plug-In The DL-NIRSP shall provide a Detailed Display plug-in extending the capabilities of the quick-look display with the following capabilities: - Full stokes spectra and/or un-demodulated raw data of each scan position as it has been acquired Full set context imager images for each scan position A zoom function for images and spectra Verification: Review Source: Operations 4.3.4 Data Processing Plug-Ins 4.3.4.1 Dark Calibration Plug-In Automated procedures will provide detector and telescope “dark” calibrations. Verification: Review Source: Operations 4.3.4.2 Gain Calibration Plug-In Interactive procedures will be used to generate spectral and spatial gain variation information for the DL-NIRSP optical path and detector. Automatic procedures will perform gain calibration on the data. Verification: Review Source: Operations DL-SPEC-0002, Revision A Page 39 of 41 DL-NIRSP DRD 4.3.4.3 Instrument Polarization Calibration Plug-In Interactive end-to-end instrument polarization calibration procedures will be provided for derivation of instantaneous telescope polarization crosstalk calibration using observation of strong magnetic features. Telescope polarization crosstalk calibration can also be derived with ATST Project provided telescope polarization model. Automatic procedure will perform polarization crosstalk correction on the data. Verification: Review Source: Operations 4.3.5 Metadata For each saved frame, the following metadata are required to be provided with the data for data processing, calibration, and reduction purposes. Full telescope pointing Time board information Polarimetry Polarization scheme Modularization state DL-NIRSP Instrument configuration Camera configuration Verification: Review Source: Operations 4.4 Camera System Under discussion with the Project. TBD DL-SPEC-0002, Revision A Page 40 of 41 DL-NIRSP DRD 5 GENERAL REQUIREMENTS 5.1 Reliability The lifetime of the ATST telescope is expected to be in excess of forty years. The remote nature of the site puts a premium on having robust systems that are easily repaired. Wherever possible, all DL-NIRSP assemblies, subassemblies, components, parts, and mechanical systems shall be designed to exceed the lifetime of the facility. Contractor shall identify any and all items not designed to exceed this lifetime, and maintenance procedures and spares lists shall be provided for them. Verification: Design Review & Analysis Requirement Origin: Engineering (SPEC-0041) 5.2 Maintainability The DL-NIRSP design shall ensure that all necessary maintenance operations can be effectively carried out without risk to personnel or hardware. Special care must be taken in the design of any hardware that would require maintenance. The Contractor shall provide all special tools and equipment necessary for initial set-up, maintenance, and servicing operations required throughout the operational life of the equipment. This excludes common hand tools such as wrenches, sockets, Allen keys, etc. Custom stands, sights and instruments necessary for initial set-up of the system, debug, and regular maintenance shall be delivered as special tooling and equipment. Any special fixtures, such as alignment gages and calibration targets, necessary for assembling parts of the DL-NIRSP shall be deliverable. Special tools shall be marked with the part number. Verification: Design Review Requirement Origin: Engineering 5.3 Commonality of Designs Wherever possible, the Contractor shall utilize identical equipment and designs throughout the DLNIRSP. The purpose of doing this is to reduce costs associated with design effort, spares, maintenance, and the like. To the extent possible, the Contractor shall adopt designs used throughout the observatory for similar equipment to maximize commonality. Verification: Design Review Requirement Origin: Engineering 5.4 Conditions of Use The DL-NIRSP subassemblies shall be capable of being mounted as shown on the corresponding interface drawings. The equipment shall meet all functional and performance requirements at any operational condition while mounted as part of the ATST. Verification: Design Review &, Analysis Requirement Origin: Engineering DL-SPEC-0002, Revision A Page 41 of 41 DL-NIRSP DRD 5.5 Facility Services Interface The DL-NIRSP subassemblies shall be capable of meeting all functional and performance requirements while being supplied with facility services as defined in the corresponding specifications and interface control documents. Verification: Design Review & Inspection Requirement Origin: Engineering (SPEC-0063) 5.6 Interfaces The DL-NIRSP subassemblies shall meet requirements in all applicable ICDs and related drawings. Verification: Design Review & Inspection Requirement Origin: Engineering 5.7 General Design Requirements All analysis shall be in System International ‘metric’ units with Imperial ‘inch’ as secondary units written in parentheses. Verification: Design Review & Inspection Requirement Origin: Engineering (SPEC-0070) 5.8 Electrical System Requirements TBD 5.9 General Fabrication Requirements The DL-NIRSP subassemblies shall meet requirements in all applicable specifications regarding mechanical and software assemblies and all relevant specifications related to environmental conditions. Verification: Design Review & Inspection Requirement Origin: Engineering (SPEC-0070) 5.10 Spares 10% of all electro-mechanical components will be provided as spare parts. 5.11 Environmental Requirements The ATST observatory site is located at an elevation of 3050 meters. This needs to be taken into account when transporting from sea level to the observatory site. DL-SPEC-0002, Revision A Page 42 of 41
