Download SOFIA Engineering Meeting 12-May-2011

SOFIA Proposal
Engineering Meeting 12-May-2011
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Two science teleconferences held
– Astronomers involved include Al Wooten, Todd Hunter, Yancy
Shirley, Tony Remijan, Ted Bergin, Gary Melnick, Bryan Butler, and
Mark Gurwell
– Increased sensitivity of SIS over HEB really really wanted
– Need to have at least order-of-magnitude improvement over GREAT
without sacrificingg frequency
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y agility
g y
• Since we can’t yet get this improvement in sensitivity, get it in
mapping speed with more pixels
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Expanded science case
– SOFIA is an observatory, not a mission
– Given constraints of airplane, flight plans, etc., need to observe
multiple
p targets
g each flight
g to maximize relativelyy small observingg time
(only 1000 hours per year in full opertations)
Al working on sensitivity calculator for SOFIA with 1000K and 300K DSB
noise temperature
p
Met with Ed Tong from SAO who has been working with HEB mixers
– 0.5 K/GHz is current state-of-the-art for HEB mixers
• Gives 700K for 11.4
4 THz,
THz plus allowances for optics
optics, etc.,
etc 1000K is
reasonable spec for 1.2-1.5 THz
SOFIA Proposal Engineering Meeting 12-May-2011
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SOFIA Completes
p
First Flight
g of GREAT
April 7, 2011
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Current Strawman Specs
p
for NRAO
Instrument
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Facility Instrument
8 pixels balanced HEB
Single-polarization
1218-1492 GHz
1.5-3.0 GHz 1st IF
1000K DSB
S
Spectrometer
– 1.5 GHz, 2048 channels (732 kHz resolution) with 187.5 MHz zoom
mode (92 kHz resolution)
• At 1.4 THz, 300 km/s range with 18 m/s resolution in zoom mode
SIS is an upgrade path
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SOFIA Call
C ll for
f Proposals
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Scheduled to be released June 30
Final proposal then due Sept 30
$35M spread over FY12-FY18
– One investigation to begin mid-FY12,
mid-FY12 additional investigations to begin
one year later
One new instrument commissioned per year starting FY15
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S i
Science
IInstrument
t
t System
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SI assembly (cryostat, optics, electronics) mounted at the instrument
flange of the Telescope Assembly
“Counterweight Rack” mounted on Telescope Assembly which can be
populated with SI equipment. 19-inch rack frame provided by NASA
Up to three “PI Racks” of SI equipment installed over center wing section
of main deck. Dual-bay, short, 19-inch rack frames provided by NASA
Chopper
pp interface electronics (optional)
( p
) to drive Telescope
p Assemblyy
secondary mirror chopper
SI Installation Cart to transport the SI through ground facility, onto
aircraft,, and install on Telescope
p Assemblyy instrument flange
g
Any lab stands or ground support equipment required for routine
maintenance of instrument
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NASA Furnished
F
i h dE
Equipment
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PI rack(s)
PI rack installation dolly
Counterweight rack
Counterweight rack installation cart
Lab space at DAOF for integration activities
Lab technicians and supplies to support integration
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T i pertaining
Topics
t i i to
t airworthiness
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thi
off SI
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Anything that can cause injury to personnel
Anything that can cause a fire
Commands by one system to others that result in hazardous conditions
Systems that monitor,
monitor provide warning of
of, or prevent hazardous
conditions
Anything that affects the aircraft pressure boundaries
Foreign Object Damage and equipment security
Pressure systems
Cryogens
Toxic substances
Radiation, both ionizing and non-ionizing
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I t
Instrument
t Interfaces
I t f
- Optical
O ti l
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SOFIA telescope is a two mirror bent Cassegrain with single Nasmyth
instrument mount fed by a flat tertiary
Effective aperture is 2.5m and provides f/19.5 beam to instruments
Secondaryy mirror pprovides p-p
p p chopp amplitude
p
of 10’ between 0-20 Hz
– Secondary mirror chopper triggered from TTL waveform from SI
Dichroic tertiary for optical imaging and guiding cameras
No window installed in optical path,
path i.e.
i e the SI is the pressure barrier to
the main cabin
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Instrument
t Interfaces
I t f
- Electrical
El t i l
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Connections to SI include power, LAN, GPS, and IRIG-B timing
– Provided at PI patch panel near PI racks
PI racks and telescope assembly separated by ~25 feet
SOFIA provides cables from PI patch panel to Telescope Assembly (TA)
patch panel routed under the cabin deck
SI and counterweight rack connect to TA patch panel
Currently a total of 5 KVA available for SI use
Intent is to provide up to 15 KVA for new instruments
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I t
Instrument
t Interfaces
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- Software
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Observatory is controlled by the Mission Command and Control System
(MCCS) which coordinates the aircraft, telescope, and science instrument
(SI)
SI issues commands to the observatory via the SOFIA Command Language
(SCL), which are then executed by the MCCS
MCCS provides housekeeping data to SI for reducing data and populating
FITS headers
SOFIA Data Cycle System (DCS) provides long-term archival and retrieval
functions for raw and reduced SI data (data stored in FITS files)
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Commissioning
g and Guaranteed
Observing
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Proposers shall estimate number of flight hours needed for commissioning
In addition, PI is granted 50 hours of guaranteed observing time
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Proposal
p
Requirements
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Scientific/Technical Investigation (20 page limit)
– Overview
– Scientific Goals and Objectives
– Investigation Requirements
• Must include “Traceability
Traceability Matrix”
Matrix describing required “objectivesobjectives
to-measurement-to-mission traceability”
– Measurement Data and Other Investigation Products
– Descope Options
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P
Proposal
l Requirements
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Scientific/Technical Investigation continued…
– Implementation: Instrumentation
• Preliminary description with a block diagram showing interfaces,
alongg with description
p
of estimated performance
p
• All enabling technologies required to be at TRL 6 or higher
– TRL 6: “System/subsystem model or prototype demonstration
in a relevant environment
environment”
• Data analysis and archiving
• Science/Technology Team
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Proposal
l Requirements
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Investigation Implementation (20 page limit)
– Heritage and maturity of mission elements
– Reliability measures (use of redundancy, etc.)
– Instrument assembly,
assembly testing,
testing and calibration
– Technology Development (discouraged)
• Plan for bringing identified items to TRL 6
– Product
P d
Assurance
A
– Risk Identification and Mitigation
– Identification of instrument to aircraft interfaces
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Proposal
l Requirements
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Investigation Implementation continued…
– Management and Schedule
– Cost and Estimating Methodology
• Highly encouraged to provide the following (not counted against
page limit)
– MEL
– WBS
– WBS Dictionary
– WBS Cost Table
– Basis of Estimate Details
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Proposal
l Requirements
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EPO Plan not needed (SOFIA provides)
Appendices
– Letter(s) of Commitment
– SOWs
– Resumes
– Heritage
– References
R f
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I t
Instrument
t Design
D i - Optics
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Need to couple 8 beams from feedhorn to Telescope Assembly optics
Baseline is waveguide balanced mixer, fallback is single-ended mixer with
LO beamsplitter
For p
proposal,
p
, want ppreliminaryy design
g with Inventor drawings
g
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I t
Instrument
t Design
D i - Mixer
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HEB Mixers
– NbN p-HEB fabricated at UVA
– Edward Tong (SAO) is lead on this
NTC shop to fabricate prototype mixer block of E.
E Tong
Tong’ss design this
summer
E. Tong already has some HEB mixer chips (quartz)
Will perform noise measurement at SAO this summer,
summer with results in
time for proposal
HEB then will be redesigned on SOI, first single-ended then balanced
I
Integrated
d Feedhorn/Mixer/LNA
F dh /M
/LNA
Integrate 4 or 8 pixels into single block?
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Instrument
t Design
D i – Local
L
lO
Oscillator
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ALMA Front End LO Design, using YIG-tuned oscillator with x3 AMC and
PA
MMICs in PA block will use GaN rather than GaAs
– W-band GaN MMICs available from HRL or Quinstar
Q
– Trying for demonstration this summer
Use VDI x2-x3-x3 frequency multipliers with 67.8-82.8 GHz driver (same
as ALMA LO Band 4/8/9)
>10 W over full band (enough for balanced SIS or single-ended HEB
with coupler/beamsplitter)
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Instrument
t Design
D i - IF
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1.5-3.0 GHz IF
No isolator, use either SiGe HBT or balanced HFET cold LNA
Recently delivered HBTs from ST wafer give Tmin of 1K at 4 GHz
– Matt Morgan has 1.7-2.6
1 7-2 6 GHz LNA design using these devices
• Results from this LNA can be used in proposal
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Instrument Design
g – Digitization
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Spectrometer
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1.5 GHz is current capability of CASPER hardware
Digitize in second Nyquist zone
Capitalize on GUPPI and new GBT spectrometer experience
Can also use “off-the-shelf”
off-the-shelf spectrometer from RPG or Omnisys as
benchmark for costing and power consumption
Rich Lacasse working on this
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C
Cryogenics
i and
d Mechanical
M h i l Design
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Current instruments (GREAT and CASIMIR) use liquid He filled Dewars
Increase from 5 KVA to 15 KVA allows use of Sumitomo refrigerator
“The design and operations of SOFIA Science Instruments shall permit
installation on the SOFIA aircraft,, optical
p
alignment,
g
, cryogenic
y g
servicingg
and cold functional check-out of Science Instruments within an 8 hour
period.”
– Therefore,, receiver must be cold before movingg onto pplane and
installation
For proposal, need some initial drawings, calculations, and cost estimates
for design
g and airworthiness qualification
q
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S ft
Software
& Data
D t Pipeline
Pi li
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Help!
For proposal, need plan and cost estimates
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C lib ti
Calibration
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Help!
“SOFIA Science Instrument astronomical data shall be flux calibratable to
within 20% RMS.”
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N t steps
Next
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Preliminary costing
Sensitivity calculator for next Science meeting
Awaiting release of “Science Instrument Developers Handbook”
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