Universities Space Research Association Page 1 HAWC High-resolution Airborne Wideband Camera How Are...

Universities Space Research Association

HAWC High-resolution Airborne Wideband Camera

How Are We Coming along?

Bob PernicProject Manager

Al HarperPrincipal Investigator

April 2009 Review


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


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


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

.


Fore-optics Design


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.


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


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


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


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


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


HAWC Milestone Schedule


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.

Universities Space Research Association Page 1 HAWC High-resolution Airborne Wideband Camera How Are...

Documents

Transcript of Universities Space Research Association Page 1 HAWC High-resolution Airborne Wideband Camera How Are...