Post on 18-Dec-2015
Universities Space Research Association
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HAWC High-resolution Airborne Wideband Camera
How Are We Coming along?
Bob PernicProject Manager
Al HarperPrincipal Investigator
April 2009 Review
Universities Space Research Association
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Development Status
Test Cryostat : Retired
Flight Cryostat : Operational
Housekeeping System : Operational
ADR : Operational
OMS : Operational
Detector : Operational
Electronics : Operational.
Software : General User interfaces coming along nicely.
Data reduction software in development.
Internal Optics : Operational
Fore-optics and calibration system:
Detailed design underway
Flight System Integration: Work in progress
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Airworthiness Status(Similar to recent previous reviews)
Cryostat, ADR, & OMS Assemblies: 8110-3 approved
Electronics, Detector, & Optics Assemblies:
Resubmission on hold
Revised drawing package: Being updated
System Safety Analysis: SSA initiated
Electronics CADR: 80% completed
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December 2008 Status
Subsystem Technical Budget Schedule Comment
Cryostat Operational
Optics Operational
Detector Operational
Electronics Fabrication of full complement complete
Software No outstanding issues
Integration & Testing
Just completed two months test with fully integrated flight systems
Airworthiness We understand the requirements
ICP (Integration Commissioning Plan)
Thinking about it
.
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March/April 2009 Cold Tests(Preliminary results; tests still underway.)
• Electronics: Integrated, tested, and debugged complete data acquisition system (full complement of 384 channels). Noise performance meets specifications.
• Battery power supply for analog electronics failed because of short in manufacturer-supplied battery pack. We built up an AC power supply for current lab tests and are investigating battery problem. In lab, AC power supplies do not seem to increase noise. We may be able to fly with AC supplies, but need battery backup, at least for early flights.
• Encountered noise problem with externally supplied sync signal. We diagnosed and fixed the problem.• Current HK and OMS cables have known grounding problems. Need to repair and/or replace before next tests.
• Cryogenic systems• Shorted temperature sensor in middle JFET drawer initially prevented operation of two detector rows. Developed work-around by
disabling one detector and re-wiring both heater circuits to use a single sensor.• Performance of ADR heat switch has decreased. Adjusted cycle parameters to compensate. We are achieving full cycles and
see little effect on ADR hold time. Suspect diffusion of helium gas through side-walls of switch assembly. Goddard cryogenics group will refurbish the switch before next cold tests.
• Little improvement in thermal performance of mechanisms after installation of superconducting motors. However, both new and old motors meet basic operational requirements.
• Detector performance and optics• Point-spread functions for all bands.• Complete set of multi-temperature iv curves to determine detector model parameters.• Hot-plate signals vs. bias for all bands and pupils.• Noise vs. bias for all bands and pupils.• Successfully tested electrically modulated point sources to be used in fore-optics boresight system.• New 200-mK baffle reduced detector backgrounds from scattered light. However, there are still some low-level ghost images
from diffraction of light from out-of-field point sources.
• Computer systems and software• New master computer and new parallel interface cards have improved system performance. System functions well with full 384-
channel data electronics system.• Data acquisition software now working in client/master mode. Overall operation has been reliable. Debugging and user-interface
development are proceeding.• Prototype data pipeline components tested with laboratory data.
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Issues to be addressed prior to next round of tests
• Fix electrical shorts in cold JFET drawer • Fix ground problems in HK and OMS cables• Rebuild interface from external sync source to data electronics based on
improved design developed during current cold tests• Fabricate box for flight AC power supplies• Fabricate spare Timing and Control, Auxiliary Analog, and Chopper Interface
boards• Put power Data Electronics power distribution board, interface connectors, and
cooling system into final flight configuration• Resolve issues with batteries
• Refurbish ADR heat switch • Review performance of superconducting motors (less improvement over
copper-winding motors than anticipated)• Review design of 200-mK baffle. Investigate external field stop.• Continue to develop/refine data acquisition and data pipeline software
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Issues to be addressed prior to next round of tests
• Mitigate electrical shorts in the cold JFET - GSFC will assist. • Although stray light from 200-mK baffle appears to be eliminated -
further data reduction is required to determine effectiveness
• Electronics are functional and noise levels appear as expected. Some minor changes may be required
• Heat generated by Optical Mechanical System’s Super conduction Motors is problematic. Have entered into discussion of issues with the motor manufacturer to mitigate.
• Continue to develop/refine data acquisition software
Universities Space Research Association
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HAWC Trimester Look Back Overview
HAWC Milestone Completed
Yes/No
HAWC Critical Path Item Yes/No
Comments
Run fully integrated systems tests
Yes Yes Results of tests look good. Some systems require further attention
Detailed design of warm optics.
No No Delay caused by reduction in budget
Complete MCS integration tier 4
No Yes Project office dependent
Continue data pipeline and analysis software
Yes No Work in progress
Continue airworthiness certification
Yes No Starting this summer as scheduled
Universities Space Research Association
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HAWC Trimester Look Ahead OverviewHAWC Milestone Completed
Yes/No
HAWC Critical Path Item Yes/No
Comments
Write report on latest round of system tests
No No Some data reduction has been taking place while testing was in progress
Minor debug electronics
No No Work in progress
Complete detailed design of warm optics.
No No Work in progress
Complete S.W.Client No Yes To be completed next GFY
Work in progress
Complete MCS integration tier 4
No Yes Not scheduled at this time
Data analysis software No No Work in progress
NASA flight certification No No Work to begin the first of this year
Modifications of OMS & Geneva mechanisms
No Yes Some minor modification needed
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HAWC Budget GFY09
• Funding available for year 2009 $900,000
• Total invoiced this year
• Approximate expenditures to date
• Projected Expenditures at end of FY $900,000
• Projected carry over $0
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Summary
Based upon our new funding levels, HAWC will be:- Moved to NASA/Dryden in mid 2012, to commence EMC testing and airworthiness certifications. (We are still grasping with the effects of the newly proposed schedule budget).
-We expect to continue hardware,software and document development into 2011. - Ready for science in 2012
- Commissioned as Facility Science Instrument in 2013.