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Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 PACS Test Cryostat, OGSE and MGSE Gerd Jakob MPE AIV 1 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Test Equipment and OGSE: Overview vacuum-pump m3/h He-pump RS 232 Pumping unit m3/h CEA 300 K Harness m3/h IEEE/ RS 232 cryostat temp diodes Monitor 218 IEEE cryostat temp sensors Monitor 1 TIC 304 M IEEE Monitor 2 TIC 304 M gas cell Scanner 3716 TEST OPTCS 4-300 K Harness ext. BB and controller XY Stage CRYOBB1 IEEE Hotplate IEEE CRYOVAC PACS FPU Scanner 3716 Temp Sensors Monitor 218 BB1 Controller 370 BB2 Controller 370 IEEE RS 232 IEEE I/F LENS I/F Motor drive electronics IEEE RS 232 1.7 K LHe IEEE RS 232 LHe 4.2 K RS 232 LN2 Testoptics 4 K Harness RS 232 Pressure Monitor PKR 251 RS 232 AIV SPU testoptics 300 K Harness 4.2 K LHe-Level Model 135 77 K LN2-Level Model 186 DPU PACSTestcryostat 77 K 1.7 K LHe-Level Model 136 BOLC DEC/MEC CSL 300 K Harness CRYOBB2 CRYOVAC P XY-Stage Control PC "Labview" RS 232 IEEE 2 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 PACS test cryostat specifications • • • • • • • • • • • AIV Two liquid helium reservoirs: 70l for 4.2K and 13l for 1.7K level 90l liquid nitrogen for thermal shielding Optical bench diameter 1060mm, covered by 4.2K thermal shield with 900mm available height for PACS FPU + test optics Hold time of each temperature level ~48 hours with full PACS operation (goal) Specified mechanical, optical and electrical interfaces to PACS FPU and test equipment 2 FIR windows for calibration sources input and for optical alignment checks 2 window shutter/filter mechanisms at 77K shield Cryogenic filters at 77K and 4.2K shields to provide predicted Herschel telescope background Representative cryogenic harness with ~1100 wires + 227 shields for FPU, ~124 wires + 20 shields for cryostat and test equipment Specific mounting rack for different cryostat operation positions, e.g. 30° tilt for cooler recycling; 90° tilt for shield mounting and cryostat transport. Provide clean instrument environment, payload integration in cleanroom class 1000 3 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Test cryostat status • • • • • • • • Cryostat built at Cryovac GmbH; MPE’s design specifications fulfilled Cryo harness built, integrated with cryostat and tested by MPE in cw31/03 Several cryo tests performed: -hold time 77K level ~57h -hold time pumped 1.7K level >60h, lowest temperature 1.4K -hold time 4.2K level ~56h, but only without 4.2K-shield! Cryostat failed last acceptance test with 4.2K-shield in cw 42/03 Optical bench temperature too high (6,3K); 4.2K LHe-tank hold time ~24 hours (48h goal); shield temp. 25K Heat dissipation on 4.2K level ~1W higher than without 4.2K-shield Investigations on a presumable thermal link ongoing; modifications and amendments in progress Delivery to MPE for optical alignment of test optics with STM after successful acceptance test, end Nov.03 AIV FPU integration evacuation optical bench dia.1060mm operation with 20°tilt cryostat transportation PACS cryostat in different positions: Overall height ~2400mm, Mounting rack ~1400mm x 2100mm 4 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Test optics and Herschel telescope simulator specifications • • • • • • • • • • AIV Herschel telescope simulator test optics to be integrated with test cryostat, aligned to PACS FPU and operated at 4.2K Image quality goal: 3µm wave front error (PACS), field distortion less than 1 blue photometer detector pixel for the total chopped PACS field of view Design of a complex opto-mechanical imaging and baffling system, internal and external calibration sources Provision of FIR background based on Herschel telescope temperature of 70K-90K 3 cryogenic mechanisms for different internal and external calibration source selection 2 internal calibrated cryogenic blackbodies TUFIR wavelength calibrator in combination with an internal integrating sphere TUFIR input in combination with a point source simulator External blackbody, extended or with point source simulator Water vapor absorption cell for initial wavelength calibration 5 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Test optics schematic and design BB1 test optics housing and baffling system T C background heater integr.sphere aperture 4.2K M7 CW1 F4 light cone P3 F5 H P H P2 M5 M6 G point source mask and X/Y translation stage GB2 P 3 B T MD2 C chopper wheel C 2. TUFIR input point source F3 shutter2 T IF PC I/F C control MD3 T temperature read out P position switch H hall sensor GB gear box MD motor drive M mirror A alignment mirror P pupil F focus M2 BB blackbody CF cryogenic filter CW cryostat window M4 H 3. external BB: extented or point source M1 T A1 A2 C P1 M3 F2 GB1 flip P mirror C MD1 mech.1 T PACS-FPU 4. water vapour absorption cell with BB CW2 H P alignment with auto collimator CF CF M9 CF CF 1. TUFIR input integr. sphere CF P4 M8 T T M10 P5 external calibration sources: T C BB2 T C shutter1 PACS test cryostat T align.cube align.device test optics rigid support structure F1 telescope X focus Z T T T 77K liquid helium 4.2K T T T T 1.7K 77K PACS test optics G.Jakob 31.10.03 IF AIV 3D design of test optics and Herschel telescope simulator 6 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Test optics status • • • • • • • • Herschel telescope simulator test optics designed, built and assembled at MPE Rigid tripod structure with optics base plate and stray light reducing housing to be integrated with test cryostat Interfaces to cryostat, calibration sources and test equipment complete Test optics harness parts under final assembly Temperature sensors, positions sensors and read outs implemented Test equipment available Integration of 10 mirrors, integrating sphere, mechanisms and optical alignment is ongoing Optical alignment accuracy goal of test optics to PACS FPU within +/- 1 arcmin by means of a minimum of 3 cryogenic tests to be performed in test cryostat AIV 7 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Test optics status ctd. • • • • • • • • FIR black coating according KT72process applied to test optics housing and components 7 temperature sensors on motors, pupil P1, mirrors, structure Thermal I/F and cooling straps for PACS FPU manufactured and available The MPE developed cryo torquer motor was successfully operated at 4.2K Motor life time test with gear box successful at 4.2K Chopper wheel performance test at 4.2K to be repeated with reduced friction of angular ball bearing in order to achieve the goal for chopping frequencies up to 2Hz Flip mirror mechanisms to be tested at 4.2K in combination with motor/gear Alignment and integration is performed in cleanroom class 1000 AIV Test optics and PACS FPU STM Cryo flip mirror Mechanism1 assembly with gear box and cryo torquer motor 8 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Internal calibration source: cryogenic blackbody • • • • • • • • • Design and manufacturing of 2 identical cryogenic blackbodies for absolute flux calibration and background; devices selected or chopped by test optics chopper wheel 18mm opening of cavity adapted to test optics pupils P4 and P5 FIR coating acc. KT72-process applied Operational temperature range 4.2K – 80K Typical temperatures of 10K – 60K can be stabilized within 35 minutes by a heater power of 100mW with controller LS370 Power dissipation typically 12.5mW at 30K and 35mW at 50K Absolute temperature accuracy +/-20mK at 20K and +/-35mK at 50K with integrated calibrated temperature sensor CX-1070 and contr. LS370 Thermal stability requirement of <+/-1.25mK at 30K and <+/-5mK at 50K feasible Status: final assembly ongoing, test equipment available, tests at cryogenic temperature to be performed during test optics alignment checks AIV MPE design of a cryogenic blackbody 9 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 External calibration source: TUFIR and I/F • • • • • TUFIR (tunable high resolution coherent FIR radiation source) used for final wavelength calibration and spectral ghost detection I/F implemented in test optics design; input through cryostat windows 1 and 2; selected by cryo-mechanisms Window 1: -4.2K-aperture for 300K background reduction -f/4.4 light cone for TUFIR beam collection -integrating sphere dia. 80mm for homogenous illumination of pupil P3 and for filling the telescope simulator beam -background heater to simulate Herschel telescope temperatures of 70K-90K Window 2: -point source mask in combination with TUFIR located in external focus F2; PACS chopped field of view completely covered -Herschel telescope background simulated by attenuation filter sets on different temperature levels Status: test optics I/F available, TUFIR I/F to be defined AIV Test optics with integrating sphere, 4.2K-aperture and background heater for TUFIR input through cryostat window1 10 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 External calibration source: blackbody P A C S e tsc tryo sa tt M 2 • • • • • • • AIV C C W 1 e tso tp c i ts P S M 1 P 1 F 2 G B 1 M 3 p i l f m rro i r M D 1 m ech 1 . X Z e te l sco p e F 1o fcu s Cco n ro t l M D m o o t rd ri ve M m rro i r P p u p l i BB 300K-750K External blackbody in combination with scannable point source simulator for point spread function and grating alignment investigations Design of X/Y translation stage and point source simulator finished Scanning area covers the complete field of external focus F2 Reproducibility goal 20µm Point source simulation pattern to be PC controlled and synchronized with PACS data read-out Calibrated blackbody source and controller available, temperature range 300K – 750K, maximum cavity opening dia. 25mm Hot plate alternatively foreseen Status: manufacturing has been started CF CF CF • ran t sl st . ag e X Y C P S p o n is to u rcem ask F o fcu s C F cryo g en cf i er t l i C W cryo st at w n i d o w G B g earb o x Schematic of external blackbody set-up (above) and 3D design with point source mask on X/Y translation stage, aligned with cryostat window2 11 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 External calibration source: water vapor source • Design of a water vapor absorption cell for initial wavelength calibration 300mm absorption path length and typical water vapor pressure of 10-25mbar provide appropriate absorption lines in the PACS wavelength range Alternative gas CO foreseen Hot plate provides background, temperature range 300K – 600K Alignment with external focus F2 at test cryostat window 2 Status: final design finished end of Nov.03 M 1 10001 m bar F I 501 m bar F I C W 2 bar 300m m 15m est t opt cs i M 2 X Z • • • • AIV F1t el escope f ocus w at er vapour absor pt oncel i l F2 G B 1 M 3 p f i l m or r i M D 1m ech. 1 CF CCFF • P1 H 2O e r ser vor i pum p F I PC F / I M D m ot or dr ve i G B gear box M m r i or Ppupl i Ff ocus C Fcr yogenc i e t l i fr C W cr yost at w ndow i schematic of the water vapor source set-up (above) and 3D design of absorption cell aligned with cryostat window 2 12 h ot plate 30 0K -6 00K PA C Se t st cr yost at Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Mechanical ground support equipment MGSE Hoisting device for PACS FPU available, used for STM integration 06/03 AIV Crane with fine drives installed in MPE PACS cleanroom class 1000, 07/03 Pumping unit available, containing oil free vacuum and helium pumps, pressure gauges, gas flow meters and vacuum assembly; 10/03 13 Test Cryostat, OGSE and MGSE PACS IHDR: MPE 12/13 Nov 2003 Mechanical ground support equipment MGSE ctd. PACS FPU class 1000 transportation container with shock absorber, shock and tilt indicators, venting ports; design complete, manufacturing starts 11/03 AIV 14