NIRSpec Status

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NIRSpec Status
JWST-PRES-012922

• JWST Partners Workshop
• Ottawa, May 18th 2009

ESA Project Manager Peter Jensen ESA
Project Scientist Peter Jakobsen Prime
Contractor Project Manager Ralf Maurer Prime
Contractor Astrium GmbH
Ralf Maurer, Harald Feuer Astrium GmbH Phone 49
89 607-29469 Ralf.Maurer_at_astrium.eads.net
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• Status of Instrument Activities

• Subcontractor Status
• Programmatic Status and Looking 6 month ahead

This document is the property of Astrium. It
shall not be communicated to third parties
without prior written agreement. Its content
shall not be disclosed.
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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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TOP Risks Issues (1/3)
Area Details Status Mitigation
Grating Design and Performance 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 failure Wire bonds MSA 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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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 started An 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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TOP Risks Issues (3/3)
Area Details Status Mitigation
Detector Subsystem 6 ASIC fracture problem Total noise DQE 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.
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• Status of Instrument Activities

• Subcontractor Status

• Programmatic Status and Looking 6 month ahead

This document is the property of Astrium. It
shall not be communicated to third parties
without prior written agreement. Its content
shall not be disclosed.
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SiC Parts

• Achievements
• Last piece under manufacturing
• Next Steps
• Completion of manufacturing in July

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Three Mirror Anastigmat (TMA) Plane Mirrors

• Achievements
• Flight model FOR TMA and Plane Mirrors delivered

• flight COL TMA in Cold Test

• Flight CAM TMA alignment nearly finished

• Next steps
• COL and CAM cold test
• Delivery Plane Mirrors and FS

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Grating and Filter Wheel Assembly (FWA)

• Achievements
• FWA FM in final integration step
• GWA FM integration started
• CDR closed, however FM grating manufacturing
  delayed

• Next steps
• FWA testing, delivery expected July
• Grating manufacturing and GWA integration

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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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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

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CAlibration Assembly (CAA)

• Achievements
• AQM under test
• FM parts available
• Next steps
• AQM testing
• Completion of FM integration, testing delivery

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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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OA Int. Harness

• Achievements
• FM Harness delivered
• FM harness integrated
• Next steps
• none

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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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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

• 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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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 (lt6e-) 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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MSS Status

• Microshutter 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

Microshutter Array

• Mechanism status
• Flight launch lock motors (qualification, flight,
  and flight spare) have been received and passed
  initial acceptance testing
• Engineering Test Unit (ETU) magnet actuator
  successfully completed 2x (100K) life cycles
• Flight magnet actuators are scheduled to be
  delivered this month

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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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OA Cover

• Achievements
• DM delivered and mounted
• Design improved
• FM manufacturing started
• Next steps
• FM manufacturing delivery

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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

NIRS-CRAL-PL-0007

• 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.

NIRS-CRAL-PL-0001
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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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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

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JWST Partners Workshop NIRSpec Status

• Status of Instrument Activities
• Subcontractor Status

This document is the property of Astrium. It
shall not be communicated to third parties
without prior written agreement. Its content
shall not be disclosed.

• Programmatic Status Looking 6 month ahead

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Master Bar Chart
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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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End of 2008