NIRSpec Status 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: JWST-PRES

Status of Instrument Activities 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. 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 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

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 p4

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 p5 TOP Risks & Issues (1/3) Area # DetailsStatus & Mitigation Grating Design and Performanc e 1Grating Efficiency about 10% out of spec Wrong ruling parameters used (conical diffraction was not considered). Repair by IBE is running, new ruling ongoing MSS2  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

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 p6 TOP Risks & Issues (2/3) Area#DetailsStatus & Mitigation RMA mirrors 3Mirrors 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 4Motor 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 5FWA, 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

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 p7 TOP Risks & Issues (3/3) Area # DetailsStatus & 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.

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 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 p9 SiC Parts Achievements  Last piece under manufacturing Next Steps  Completion of manufacturing in July Optical Bench Base Plate Part 1 CAM structureCOM housing

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 p10 Three Mirror Anastigmat (TMA) & Plane Mirrors Achievements:  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

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 p11 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

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 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

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 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)

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 p14 CAlibration Assembly (CAA) Achievements:  AQM under test  FM parts available Next steps:  AQM testing  Completion of FM integration, testing & delivery

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 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

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 p16 OA Int. Harness Achievements:  FM Harness delivered  FM harness integrated Next steps:  none

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 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

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 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  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.

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 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 mW versus a requirement of 10.5mW

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 p20 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  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 Microshutter Array

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 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

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 p22 OA Cover Achievements:  DM delivered and mounted  Design improved  FM manufacturing started Next steps:  FM manufacturing & delivery

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 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. NIRS-CRAL-PL-0007 NIRS-CRAL-PL-0001

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 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

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 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 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.

p27 Master Bar Chart

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 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!

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 p29 End of 2008