TIPS
NIRSpec Hardware and Status
Tony Keyes (Tracy Beck) / Dave Soderblom
21 April 2011
JWST NIRSpec Quick
Summary
•  NIRSpec is the main near-IR spectrograph for JWST – operating at
1-5µm. It has three main observing “modes”:
–  Multi-Object Spectroscopy with the Micro-shutters
–  Integral Field Spectroscopy
–  Fixed Slit single-object Spectroscopy
•  Primary contract for NIRSpec is through ESA, P. Jakobsen is PI.
–  The main build and integration of NIRSpec is contracted to EADS Astrium,
in Ottobrun, Germany. They are responsible for Instrument Optics and
most hardware.
–  NASA is building the Micro-Shutter Subsystem (MSS) including the Microshutter Array (MSA), and the Detector Subsystem (DS), which consists of
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two Hawaii 2-RG detectors.
NIRSpec I&T Timeline
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Flight Candidate DS Testing: Feb-May 2010 (GSFC)
Deliver Flight Candidate DS: 10 June 2010
Deliver Flight MSS: 23 June 2010
Deliver Flight GWA: 10 August 2010
DS acceptance review (@ Astrium): 4 October 2010
–  Rejected due to QE and bad pixels
–  Use in first cycle of ambient and cryo FM testing
–  DS spare testing at GSFC: Feb-Apr 2011
•  SI integration: November 2010 (Astrium)
•  Vibe, acoustic, ambient tests: December 2010
–  Passed, but fibrous contamination discovered on MSA and other
interior surfaces
•  As a result, MSA not to be operated until cleaning following cycle 1
FM testing
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NIRSpec I&T Timeline (cont)
•  FM testing cycle 1: 3 Feb – 2 Mar 2011 (IABG, Ottobrunn)
–  Preparatory, main calibration, confirmation phases all successfully
completed (summary on next slide)
–  STScI supported onsite, ~1-week shifts, nominally 2 IS at a time
–  Transported data back to STScI, ongoing assessment by NIRSpec
Cal Analysis Group
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Flight spare DS testing: Feb-Apr 2011 (GSFC)
Flight spare DS arrived in Germany: 18 April 2011
MSA cleaning: last week at Astrium
FM testing cycle 2: late June – early August 2011
–  Will use flight spare DS which is subject to same problems as
current DS
–  Main calibration opportunity for MSA
•  Deliver SI to GSFC: September 2011
•  ISIM I&T: (TBD)
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FM Testing Summary – Cycle 1
•  Prep phase: 3-8 Feb 2011 (T. Keyes)
–  Basic ground test systems and instrument setups; environment
background checks, exposure time verification
–  Initial instrument characterization including focus, darks, persistence
tests, MSA contrast map
–  MSA anti-stiction heatup (anneal) procedure test
–  EMI
•  Main Cal phase: 20-24 Feb 2011 (T. Beck, K. Pontoppidan)
–  Primary science calibration for IFU and slit modes including PSF/LSF
characterizations, throughput, flat field, and wavelength calibration;
distortion monitor; subarray mode verification and faint object testing
•  Confirmation phase: 28 Feb-2 Mar 2011
–  Following small temperature change, verify important science
calibration characteristics, including focus, flats, wavecals, distortion,
and darks
•  NIRSpec Science Team Meeting: 2-3 Mar 2011 (J. Valenti, D.
Soderblom)
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NIRSpec Component Integration, Cleaning, etc…
@ EADS Astrium (Ottobrun, Germany)
FM Tests – Down the street @ IABG
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STScI NIRSpec Team
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Bill Blair (WIT PPS Lead, Observing Scenarios)
Dave Soderblom (Observing Scenarios, WIT User support)
Diane Karakla (PPS, ETCs)
Doug Long (Detectors, WIT ODL)
James Muzerolle (Commissioning Lead, Cycle 1 Calibration)
Jason Tumlinson (Operations Lead)
Jeff Valenti (WIT DMS Lead, Goddard DS Lead)
Klaus Pontoppidan (Calibration)
Mike Regan (Detectors, WIT ODL Lead)
Tony Keyes (FM Test and I&T Lead Coordinator)
Tracy Beck (Calibration, WIT IFU Lead)
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