1. FGS Status Report Partners workshop May 2009
JWST-PRES
FGS Status Report Partners workshop May 2009
Presentation by:
TF PI – René Doyon (U de Mtl)
Project Manager – Karl Saad (CSA)
Partners workshop Ottawa 19 May 2009

2. Presentation Overview
Achievements since Last Partner’s Workshop
Project risks
- Top 5 risks and mitigation plan
Project Issues
Schedule status
- Schedule overview
- critical path
- Contingency
Science portion
TFI
Guider
Conclusion/summary
Partners workshop Ottawa 19 May 2009

3. Achievements since last Partner’s Workshop
Start of ETU integration activities
ETU Guider ETU – TFI Mass Dummies
Partners workshop Ottawa 19 May 2009

4. Achievements since last Partner’s Workshop Trial fit of TFI baffles
Start of ETU integration activities (continued)
ETU Hardware – procurement
Optical Assembly harnesses from IMP received at COM DEV
Some transitional harnesses from NASA received
Trial fit of TFI baffles
Partners workshop Ottawa 19 May 2009

5. Achievements since last Partner’s Workshop
1st iteration of Cryo Pupil Alignment test
Encountered safety issues with the test set-up – these were corrected.
Results over temperature were not sufficiently accurate to definitively determine pupil shear.
Thermal strap stiffness identified as significant source of fixture distortion during temperature excursion to cryo.
Partners workshop Ottawa 19 May 2009

6. Achievements since last Partner’s Workshop
Mechanisms – Fine Focus
Design was reviewed & changed to address negative stress margin in flexible coupling (connecting link)
Confirmed by testing
Initial Characterization complete
Included cryogenic testing and low level random vibration testing in both park and no-park positions.
Parking preload removed from design.
Mirror twist induced by parking preload was relatively high (>1 arc min). Mirror shall now be parked at nominal focus.
Partners workshop Ottawa 19 May 2009

7. Achievements since last Partner’s Workshop
Flight Software Development
Provided ID and ACQ mode interim build (aka Build 3 interim);
Successful prototyping of Etalon Control characterization algorithm with EM ECE and P0 Etalon;
Held successful Build 3 Final Design Review, covering:
TFI Functionality and interface with ISIM FSW;
Guider fault management and updates.
Completed coding of Build 3 and started HW/SW integration testing
ETU – Electronics
Started Detector & ASIC sub-assembly integration & testing
Captured electrical baseline measurements
Etalon CDR
All RIDs(RFAs) closed.
Partners workshop Ottawa 19 May 2009

8. Achievements since last Partner’s Workshop
PFM Activities
MRR #1 held January 29, 2009
KMs and Bench assembly
KMs and Bench received from LHM
KMs successfully proof-load tested
Optical bench at COM DEV
PFM Optical bench at UCC for cleaning
PFM KM proof loading test
Partners workshop Ottawa 19 May 2009

9. Achievements since last Partner’s Workshop PFM Guider TMA under test
PFM Activities (continued)
PFM Pick-Off Mirror (POM) design is unchanged from ETU POM.
Delivered to specification from Corning Netoptics
Cryo WFE test scheduled for June, 2009
PFM Guider TMA in performance testing:
PFM acceptance vibration test
Passed, WFE shift was less than 10nm over each field
PFM Pick-Off Mirrior
PFM Guider TMA under test
Partners workshop Ottawa 19 May 2009 9

10. Achievements since last Partner’s Workshop
PFM Activities (continued)
Dual Filter Wheel (DW) Mechanism
Life Test Unit (LTU) Geared motor testing at cryo completed.
Wheel assembly tests successfully performed under ambient
Coarse Focus Mechanism – LTU
Assembly and integration on-going
PFM Detector selection
All testing of SCA level FGS detectors has been completed.
FGS is left with 4 units to meet its need of 3 detectors (2 guider & 1 TFI) plus one spare.
A Flight Model FPA manufacturing readiness review was at Teledyne.
Go ahead has been given to proceed with F016 as Detector PFM
Partners workshop Ottawa 19 May 2009

11. Achievements since last Partner’s Workshop
Ground Support Equipment
HITIF (Horizontal Integration Tool Interface Frame)
Contract award end April and MRR held 13 May 09
OGSE received and post delivery checks and alignment performed
As designed HITIF concept
Removal of OGSE from its shipping container
Partners workshop Ottawa 19 May 2009

12. Achievements since last Partner’s Workshop
Ground Support Equipment
FGS Electronics Simulator
FGSES Sim #1 and #2 delivered to ISIM cert lab
COM DEV cryovac facilities – procured one additional chamber for schedule risk mitigation
FGSES
Partners workshop Ottawa 19 May 2009

13. Project Risks
Consequence
Partners workshop Ottawa 19 May 2009

14. Project Risks - Top 5 - Mitigation
Flight ASIC performance vs interim ASICs
Risk description
Potential differences between flight and interim ASICs
Knowledge of integration techniques
Lack of documentation / ITAR issues / IRCD definition
Looking at building more robustness into FGS electronics design
Getting quantitative agreement on the key ASIC interfaces.
Monitor closely evolution of flight ASIC versus F2 ASIC / Direct support from ISIM
Risk timeframe: May 2009 to Mar 2010
Overall project schedule contingency
Risk Description:
ASIC & Detector deliveries late
Early into the ETU I&T phase – technical risks
Aggressive stands on critical path activities
Risk timeframe: May 2009 to Nov 2010
Partners workshop Ottawa 19 May 2009

15. Project Risks - Top 5 - Mitigation
Integration & Testing of Detector subassembly (characterization)
Risk description:
Directly linked to flight ASIC risk above
Detector potential difference between ETU and Flight unit
use F2 ASICs to test ASIC/Detector combination to characterize system sensitivity to ASIC dependence.
Risk timeframe: Sep 2009 to Jan 2010
Detector fail to meet specifications
Risk description – as per title
Implemented more QA oversight
Considering additional lot
Support from ISIM in reviewing test data from Teledyne
Risk timeframe: May 2009 to Jan 2010
Partners workshop Ottawa 19 May 2009

16. Project Risks - Top 5 - Mitigation
Flight Detector Delivery to FGS
Risk description
Deliver from Teledyne – continuous delays from Teledyne on delivery dates
Monitor Teledyne closely
Evaluating the procurement of additional lot (to mitigate low yield)
Risk timeframe: May 2009 to Jan 2010
Partners workshop Ottawa 19 May 2009

17. Project Issues under investigation
SIDECAR Control Electronics
Problem of noise in the Detector/ASIC & SCE sub-system
Difficulties with ASIC integration
Recent breakthroughs in noise reduction:
noise significantly reduced in data analysis by including the reference pixels;
stiffening up SCE Vref and VDDA supplies; and
ASIC Bias tuning by Teledyne
Dual Wheel – bearing
Torque levels at cryo are not consistent
Analysis and test results indicate a retainer needs to be redesign
Dual Wheel
Partners workshop Ottawa 19 May 2009

18. Project Issues under investigation
PFM Guider TMA has been through two unsuccessful cryo WFE test cycles:
1) Unacceptable change in WFE in first cryo run due to settling.
2)Full test as per procedure was not completed due to GSE issue
Translation stage motor (bearing) failure
However, preliminary WFE data indicated that the change was much less than test 1
Plan is to fix the translation stage and retest.
Partners workshop Ottawa 19 May 2009

19. Project Schedule
Partners workshop Ottawa 19 May 2009

20. Project Schedule – Critical Path & Contingency
For ETU: (January 12, 2010)
Detector Assembly
FFM – 1 week from critical path
EU and repeat of the Cryo Pupil Alignment – 2 weeks from critical path
For PFM (September 29, 2010)
No overlap of ETU & PFM activities at test facilities
DW – 5 weeks from critical path
Flat Field and Wave Cal Optics – 6 week from critical path
Partners workshop Ottawa 19 May 2009

21. Project Schedule – Critical Path & Contingency
Schedule Contingency
ETU
ETU PSR date: 12 Jan 2010
5 week (PSR + Shipment* – 26 Feb NASA Need date)
PFM
PFM PSR date: 29 Sep 2010
6 weeks (PSR + Shipment* – 30 Nov 2010 NASA Need date)
(assuming 7 days delivery delay)
Partners workshop Ottawa 19 May 2009

22. Science Guider & TFI By Rene Doyon
Science Portion
Science
Guider & TFI
By Rene Doyon
Partners workshop Ottawa 19 May 2009

23. FPA selection status One device (F16) was chosen as flight spare.
Three remaining detector candidates: F21, F22 & F27
F22 has a lot of hot pixels (high dark current) but may be suitable for the guider. Evaluation is underway.
F27 is our best detector (good QE, low read noise & dark current). Would be the natural choice for TFI but its very good blue response makes it very attractive for the guider too.
Partners workshop Ottawa 19 May 2009

24. Predicted Flight coating performance
Partners workshop Ottawa 19 May 2009

25. Predicted Transmittance
Partners workshop Ottawa 19 May 2009 25

26. Maximum Wavelength Shift vs Phase
Requirement
Partners workshop Ottawa 19 May 2009

27. Performance at 1.50 µm
Partners workshop Ottawa 19 May 2009

28. BARR Filter prototypes
4 prototype filters have been successfully manufactured: F157, F226, F245, F481)
The roll-off (slope) within spec: <0.025 for F481,
< 0.02 for others
Peak transmission within spec: Absolute T≥85% within 80% of the bandwidth at the 90% relative to peak points.
Out-of-band blocking: : well below 10-4
Ready to proceed to the flight production
Partners workshop Ottawa 19 May 2009

29. BARR Filter prototype – short λ
Partners workshop Ottawa 19 May 2009

30. Barr filter – long λ
Partners workshop Ottawa 19 May 2009

31. Out-of-band Blocking < 0.01%
Partners workshop Ottawa 19 May 2009

32. PSF movie (1.55-1.75m) obtained with a short wavelength etalon prototype
FT 
ghost
Partners workshop Ottawa 19 May 2009 32

33. Contrast curve before and after speckle suppression
Speckle noise is reduced by more than a factor 10. Still preliminary but very encouraging results.
Diffraction is wavelength dependant!
Partners workshop Ottawa 19 May 2009 33

34. Laboratory PSF subtraction performance
Raw PSF
After subtraction
fake Companion fainter
added
Subtraction from two adjacent wavelengths
Diffraction is wavelength dependant!
Partners workshop Ottawa 19 May 2009 34

35. Nominal (5x5 px) centroiding precision and read noise.
Guider: NEA changes with OTE WFE
Nominal (5x5 px) centroiding precision and read noise.
Slope is: mas / nm
NEA = (WFE-105)*0.012
For WFE = 225 nm, NEA = 4.5 mas
By John Hutchings
Partners workshop Ottawa 19 May 2009

36. Guider: NEA vs signal from lab data
Model
By John Hutchings
Heavy line is model for similar centroid window and noise, flight centroid algorithm
Partners workshop Ottawa 19 May 2009

37. X-direction cuts through different places within detector pixel
Guider: CNL measured from lab data Systematic centroid offsets from pixel-sampled data
X-direction cuts through different places within detector pixel
This will be corrected for in reporting guider centroids
Signal 900e, 1.5 microns Signal 5000e, 3.2 microns
2 mas
Verification of modelled performance, plus pixel-to-pixel non-uniformities, ongoing
By John Hutchings
Partners workshop Ottawa 19 May 2009

38. Guider signal depends on the detector selected
Guide star signal mostly at short wavelengths
Estimates for the presently-considered PFM and flight detectors
By John Hutchings
Partners workshop Ottawa 19 May 2009

39. Guiding on primary segment images during primary mirror alignment
Image with 8x8 and 16x16
centroid boxes superposed
~15 mag
These are results for PSFs from individual primary mirror segments in the early stages of focus and alignment.
Little difference between G0 and M5 guide star types.
NEA 8-20 mas required for this stage of the process.
Will require an isolated guide star of 15 mag or brighter. Some images will be very non-circular.
By John Hutchings
Partners workshop Ottawa 19 May 2009

40. Conclusion Main challenges ASIC-Detector integration
Detector Delivery to FGS
ASIC delivery to FGS
Teledyne cost overruns
Mechanism – Dual Wheel bearing issues
Overall schedule contingency
The project is in ETU phase, having started subassembly testing
This is the phase under which we will encounter most of our technical risks
Aggressive risk and scope management will be key for project success.
The way forward will necessitate mutual support between FGS and NASA on the ASIC and detector front – which is occurring already
Partners workshop Ottawa 19 May 2009