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NIRSpec StatusJWST Partners‘ WorkshopOttawa, May 18th 2009
ESA Project Manager: Peter JensenESA Project Scientist: Peter JakobsenPrime Contractor Project Manager: Ralf MaurerPrime Contractor: Astrium GmbH
Ralf Maurer, Harald FeuerAstrium GmbHPhone: +49 89 [email protected]
JWST-PRES-012922
Status of Instrument Activities
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Subcontractor Status
Programmatic Status and Looking 6 month ahead
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19.5.2009 p3
Prime Contractor Achievements & Status
Manufacturing of SiC & non SiC parts being
completed for FM, FS close to finish
DM/ETU successfully vibrated, under cold test
now
NIRSpec and sub assembly CDRs closed
FM integration started
Some subcontractors have already completed
their work
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19.5.2009 p4
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19.5.2009 p5
TOP Risks & Issues (1/3)
Area # Details Status & Mitigation
Grating Design and Performanc
e
1 Grating Efficiency about 10% out of spec
Wrong ruling parameters used (conical diffraction was not considered). Repair by IBE is running, new ruling ongoing
MSS 2 Shock failureWire bondsMSA actuators
•Shock More realistic shock levels have
been determined for the MSS, tests at Astrium facility week of 25 May
Wire bond issue Aluminium wires do not withstand
shock (change to gold bonds), now gold bonds
MSA actuators new actuators to be delivered in May Launch lock motors (3) delivered
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19.5.2009 p6
TOP Risks & Issues (2/3)Area # Details Status & Mitigation
RMA mirrors
3 Mirrors showed chips and risk for crack propagation
Manufacturing of 2 sets of new mirrors is ongoing, repair to remove chips on mirrors is successfully finished; rework of existing flight mirrors will be started immediately
RMA actuator
4 Motor and gear has not successfully passed the extended life test
Alternative gear motor design is developed and confirmed, manufacturing of gear motor units (Actuator) is startedAn additional test setup will be manufactured to do the qualification testing and acceptance testing in parallel
Subsystem Schedule Slippage
5 FWA, GWA, RMA, DS, CAA and MSS are on the critical path in the overall schedule
ESA & Astrium exercise for identification of alternative integration and test scenarios completed Mitigation measures e.g. to procure additional hardware for work-around identified and agreed
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19.5.2009 p7
TOP Risks & Issues (3/3)
Area # Details Status & Mitigation
Detector Subsystem
6 ASIC fracture problemTotal noiseDQE drop
All current ASICs declared as not flight worthy New production agreed between NASA and Teledyne Pathfinder DS will be provided as surrogate
8 electrons (vs. 6) due to unstable/noisy bias voltage from ASIC
Tuning of ASIC has shown that the 6 electron requirement can be achieved, however the power requirements have not been achieved at the required noise requirement
Noise performance to be demonstrated in end-to-end subsystem
DQE drop on FM detectors has eroded the margin on sensitivity in certain wavelength areas. However, this drop may be due to test configurations and recent testing on two flight spare detectors show that they both meet DQE requirements at all wave lengths.
Status of Instrument Activities
Subcontractor Status
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Programmatic Status and Looking 6 month ahead
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19.5.2009 p9
SiC Parts
Achievements
Last piece under manufacturing
Next Steps
Completion of manufacturing in July
Optical Bench Base Plate Part 1CAM structureCOM housing
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19.5.2009 p10
Three Mirror Anastigmat (TMA) & Plane MirrorsAchievements:
Flight model FOR TMA and Plane Mirrors delivered
Next steps:
COL and CAM cold test Delivery Plane Mirrors and FS
flight COL TMA in Cold Test
Flight CAM TMA alignment nearly finished
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19.5.2009 p11
Grating and Filter Wheel Assembly (FWA)
Achievements:
FWA FM in final integration step GWA FM integration started CDR closed, however FM
grating manufacturing delayedNext steps:
FWA testing, delivery expected July
Grating manufacturing and GWA integration
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19.5.2009 p12
Refocus Mechanism Assembly (RMA)
Achievements:
Intermediate FM delivered
New FM mirrors manufactured, one cold tested
New actuator development started
Next steps:
FM/FS mirror coating to be completed
Actuator qualification FM RMA integration
and testing with new hardware
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19.5.2009 p13
Integral Field Unit (IFU)
Achievements:
IFU AQM pre shipment review in preparation
FM nearing completion and ready for testing end of May
Next steps:
Completion of FM testing and delivery IFU EQM alignment set-up
Machined Slits (cropped)
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19.5.2009 p14
CAlibration Assembly (CAA)
Achievements:
AQM under test FM parts available
Next steps:
AQM testing Completion of FM
integration, testing & delivery
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19.5.2009 p15
Instrument Control Electronic and Software
Achievements:
ICE FM successfully tested & delivered
ICE SW V3 coding completed incl. required changes (motor operation, dual mode, initialisation, RMA reference search)
ICE SW V3 successfully tested
ICE & SW CDR successfully completed
Next steps:
ICE SW V3 delivery DM/ETU testing continues
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19.5.2009 p16
OA Int. Harness
Achievements:
FM Harness delivered
FM harness integrated
Next steps:
none
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19.5.2009 p17
DS Status
DS team members (Ali Feizi (564), Yiting Wen (553), Tsu-wei Hwang (544) with QA support from Larry Morgan integrating Purple Dewar
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19.5.2009 p18
DS Status Teledyne has completed all testing of the final four SCAs in the NIRSpec
inventory. Two devices failed testing and are clearly non-flight detectors
S058 and S060 exhibited good total noise and dark current performance and are candidate flight spare detectors
Preliminary Results (as analyzed by GSFC personnel): Total Noise for S058 & S060 is 6.8e- rms and 6.4e- rms (Spec is 6e- rms) Dark Current for S058 & S060 is 0.013e-/s and 0.012e-/s (Spec is 0.01e-/s) DQE performance meets spec
DQE For S058 & S060
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Wavelength (um)
DQE (
%)
S058 S060 Spec
The final results will be used to determine whether either or both devices meet the NIRSpec sensitivity requirement (S053 & S044 will also be included in this analysis).
The best two detectors will be used for the Flight Spare FPA Build.
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19.5.2009 p19
DS Status
FPE to ASIC communication issues
Teledyne has determined that the issue can be solved by raising the common mode voltage to the ASIC
Working to change the common mode voltage (from 1.1 V to 1.8 V) supplied to the ASIC by the FPE
Meeting system noise/power requirements
The Detector Subsystem has not met both noise and power requirements during testing on the ETU and Pathfinder systems.
Noise requirements (<6e-) have been met, but at increased power dissipation from the ASIC. The ASICs being used on the Pathfinder Detector Subsystem have power dissipations of 14-17mW versus a requirement of 10.5mW
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19.5.2009 p20
MSS StatusMicroshutter Array Status
–5 flight candidate arrays have been integrated into quadrants – 4 of these 5 will be installed into the flight unit–Addtional arrays are in the process of testing and/or assembly – these will be used for flight spares
Mechanism statusFlight launch lock motors (qualification, flight, and flight spare) have been received and passed initial acceptance testingEngineering Test Unit (ETU) magnet actuator successfully completed 2x (~100K) life cyclesFlight magnet actuators are scheduled to be delivered this month
MicroshutterArray
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19.5.2009 p21
MSS Status
“Test Bed” Microshutter Control Electronics (MCE) In final assembly and testing
Flight Microshutter Control Electronics (MCE)- Motor, Digital, and Analog Control Card (MDACC) is in assembly- Array Interface Card (AIC) will begin assembly following successful
testing of the AIC test bed board.- CIC and Backplane are in testing- Power Control Assembly (PCA) assembly in progress.
Microshutter Shock- An updated specification with significantly reduced shock levels has
been developed and flowed to the MSA- The MSA structural model has been tested at Astrium and the
required shock levels were achieved- Shock testing on the qualification Microshutter Array will be
performed at Astrium, Freidrichshafen Germany the week of May 25
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19.5.2009 p22
OA Cover
Achievements:
DM delivered and mounted Design improved FM manufacturing started
Next steps:
FM manufacturing & delivery
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19.5.2009 p23
Science Support & IPS DM/ETU NIRSpec
NIRSpec as an imager (detector in the MSA plane) Not the actual flight hardware Probing the distortion and image quality of the
NIRSpec “imaging” stage independently from the spectrographic stage
Not possible at FM level
FM NIRSpec The complete NIRSpec with the flight hardware One month of cryogenic time dedicated to the
calibration / characterization of the instrument. Dedicated OGSE providing the necessary
illumination patterns and sources.
NIR
S-C
RA
L-P
L-00
07
NIR
S-C
RA
L-P
L-00
01
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19.5.2009 p24
Science Support & IPS
Key points FM calibration Most extensive campaign prior the commissioning phase ! Build the set of calibration files necessary to prepare the NIRSpec
data processing software. Deliverable to NASA/STScI. As far as possible, allow an early validation of some key NIRSpec
operation and calibration concepts / schemes. Wavelength calibration, target acquisition…
Major NIRSpec-level calibration items Calibration of the “coordinate transforms” between the OTE
focal plane and the detector plane (for TA !) Calibration of the MOS spectrographic modes
Extensive and time-consuming calibration! Classical spectrographic calibration steps
Calibration of the SLIT and IFU spectrographic modes. Characterization of NIRSpec radiometric response
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19.5.2009 p25
TV Facility
Achievements: TV facility aceptance achieved
(3 blank tests performed) NIRSpec DM/ETU in cold test
now
Next steps: Completion of cold test Prepare FM test campaign
Status of Instrument Activities
Subcontractor Status
Programmatic Status & Looking 6 month ahead
JWST Partner’s Workshop
NIRSpec Status
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19.5.2009 p27
Master Bar ChartTask Name
Major Milestone and Reviews
DM/ETU Program
SM/DM integration
DM Testing
ETU program
Subcontractor Activities SM/ETU
FM Program
FM integration
Set up on Optical Table
FOR integration
ICE / warm harness integration
RMA non flight worthy integration
COL integration
FWA FM1 integration
CAA integration
RMA flight worthy integration
CAM integration
MSA, IFU integration
GWA FM1 integration
FPA integration
Testing
Subcontractor Activities FM
FOR FM
COL FM
CAM FM
RMA FM (non-flight worthy)
RMA FM (flight worthy)
FWA FM1
GWA FM1
CAA FM
IFU AQM
ICE FM
MSS FM
FPA FM
CFR 14.07. PDR 15.02. NICE 04.07. CDR 11.12. ETU DRB 22.07. FM Ready for Delivery 26.11.
19.12.
29.06. 22.07.
11.12. 11.05.
11.12.
26.01.
11.03.
24.04.
30.06.
01.08.
07.09.
06.10.
12.11.
15.12.
22.01.
31.03.
12.05. 25.11.
15.01.
19.06.
23.09.
21.04.
10.09.
31.07.
14.12.
24.07.
19.05.
10.03.
14.09.
30.03.
01 02 03 04 05 06 07 08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12 01 022008 2009 2010 2011
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19.5.2009 p28
Locking 6 month ahead
completion of DM/ETU test program and delivery
integration of the Flight Model
Flight hardware gets more and more ready to be used in space!
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19.5.2009 p29
End of 2008
