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Detectors for the JWST Near Infrared Spectrograph (NIRSpec). B.J. Rauscher 1 , P. Strada 2 , M.W. Regan 3 , D.F. Figer 3 , P. Jakobsen 2 , S.H. Moseley 1 , T. Boeker 2. 1 NASA Goddard Space Flight Center 2 ESTEC/European Space Agency 3 Space Telescope Science Institute. Enter NIRSpec.

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detectors for the jwst near infrared spectrograph nirspec

Detectors for the JWST Near Infrared Spectrograph (NIRSpec)

B.J. Rauscher1, P. Strada2,M.W. Regan3, D.F. Figer3, P. Jakobsen2, S.H. Moseley1, T. Boeker2

1NASA Goddard Space Flight Center2ESTEC/European Space Agency3Space Telescope Science Institute

a pretty picture is not enough

Enter NIRSpec

A pretty picture is not enough ..

Most observations probably detector noise limited!

AAS, Atlanta, GA

nirspec modes
NIRSpec Modes
  • R=100 (Exploratory spectroscopy, Verify photometric redshifts)
    • Single Prism 0.6 - 5.0 µm
    • Micro-Shutter Array or Fixed Slits
  • R=1000 (Emission line diagnostics)
    • 3 Gratings 1.0 - 5.0 µm
    • Micro-Shutter Array or Fixed Slit(s)
  • R=3000 (Emission line kinematics)
    • 3 Gratings 1.0 - 5.0 µm
    • Fixed Slit or Integral Field Unit (TBC)

AAS, Atlanta, GA

nirspec

NASA/GSFC to Contribute

  • 2K4K HgCdTe FPA
  • Readout Electronics
  • Cable Harness
NIRSpec
  • Instrument built by European Industry under ESA Project Leadership
  • Presently Transitioning from Definition to Implementation Phase
  • Two NASA-provided components:
    • 4 x 384 x 175 Micro-Shutter Array
    • 2 x 2k x 2k HgCdTe Detector Array

AAS, Atlanta, GA

focal plane array fpa technology
Focal Plane Array (FPA) Technology
  • 2K4K FPA comprised of two 2K2Ksensor chip assemblies (SCAs)
  • =0.6–5.0 m HgCdTe detectors
  • FPA passively cooled to T=34–37 K
  • Very successful Phase-A detectordevelopment!
    • Raytheon and Rockwell produced outstanding detectors consistent with requirements
    • =0.6–5.0 m detectors meet challenging requirements (e.g. total noise =6 electrons rms per t=1000 seconds exposure).

AAS, Atlanta, GA

detector test results
Detector Test Results

Conversion gain on this andfollowing plots =1.3 e-/ADU

Dark current versus temperature

detector test results7
Detector Test Results

Dark current histogram

detector test results8
Detector Test Results

Sampled-Up-the-Ramp Dark Signal

detector test results10
Detector Test Results

Total noise versus number of non-destructive reads

selected highlightes from prototype testing
Selected highlightes from prototype testing
  • Amplifier glow negligible! —Multiple non-destructive reads averaging down noise.
  • Reference pixels work! —highly effective at removing e.g. Pedestal Drifts.
  • Dark current very low and independent of temperature at T < 40 K

AAS, Atlanta, GA

to learn more about jwst detector prototype test results see
To learn more about JWSTdetector prototype test results, see

Figer, D.F., Rauscher, B.J., Regan, M.W. et al. 2003, “Independent detector testing laboratory and NGST detector characterization project”, Proceedings Of SPIE Vol. 4850, 981

AAS, Atlanta, GA