Status of JWST/ISIM Test Program. Scott Friedman TIPS/JIM April 18, 2013. Acknowledgments. Thanks to the following people for providing much of the information used in this presentation Randy Kimble (GSFC) Doug McGuffey (GSFC) Joe Sullivan (Ball)
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April 18, 2013
Thanks to the following people for providing much of the information used in this presentation
Randy Kimble (GSFC)
Doug McGuffey (GSFC)
Joe Sullivan (Ball)
George Hartig (STScI), for many useful discussions
ISIM = Integrated Science Instrument Module (1)
OTE = Optical Telescope Element (2)
(analogous to the HST OTA)
OSIM = Optical Telescope Element Simulator (3)
(the light source for ISIM testing)
OTIS = OTE + ISIM (4)
First OSIM cryo-vac test completed summer 2012. Partially successful
Optical results were stable and good. Jitter and stray light appear within requirements. Thermal performance nominal.
BIA V1 stage froze at cryo temperatures.
Facilities issues troublesome (power outages, N2 leaks).
Second OSIM cryo-vac test dates
pumpdown March 15
data taking started April 14
completion May 26
It is critically important to validate OSIM so its performance is not in question when ISIM testing begins.
OSIM in the 100K section (bottom)
Beam Image Analyzer in the 30K section (top)
All science instruments delivered to GSFC fully calibrated and qualified.
SIs integrated into the ISIM structure mechanically, electrically, and thermally (flight-like to the extent possible).
Verify focus, pupil alignment, image quality, etc.
Verify thermal performance.
Verify wavefront measuring capabilities of SIs (especially NIRCam).
Test Operations Script Subsystem (OSS) and event driven ops.
Environmental test series
Vibration, acoustic, gravity release, EMI/EMC.
Similar to CV1 but not everything repeated.
Deliver to JSC for OTE+ISIM testing
Instruments not available for CV1
Many hardware items not available for CV1, most importantly new near-IR detectors.
We could wait for these to arrive but that would defer a lot of risk. So…
A new cryo-vac cycle has been added to the beginning, a cryo-vac Risk Reductioncampaign: CV1 RR
Cryo-Vac 1 RR
Cryo-Vac 1 RR Instrument Verification
NIRISS performance characterization
Some modes have not been tested end-to-end in the instrument
MIRI regression testing
Apply NRB noise mitigation recommendations to flight system
MIRI MRS spatial resolution measurement
PSF during FM testing was compromised
Tune-up of FGS ASIC
This must be done for 13 detector/ASIC pairs in CV3.
Initial trending of MIRI and FGS/NIRISS
CV1 RR is designed to retire risk and increase the chances that CV2 and CV3 execute smoothly
After Cryo-Vac 2 install all remaining hardware and then perform the environmental test series
The campaign to establish that ISIM meets all requirements
Cryo-Vac 1: 8/9/13 – 10/12/13 65 days
Cryo-Vac 2: 5/23/14 – 9/9/14 109 days
Cryo-Vac 3: 6/4/15 – 8/17/15 74 days
35 weeks of 24/7 operation will require a lot of planning and support from all stakeholders.
Let’s review equation (4)
OTIS = OTE + ISIM (4)
This is a lot of hardware but not the whole observatory! In particular, the spacecraft is not present during OTIS testing.
Recall that ISIM CV3 is scheduled for Jun – Aug 2015. Possible collision for some people supporting both tests.
* these dates highly uncertain (at least to me)