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Detector Characterization Project in the

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1 Detector Characterization Project in the
The JWST Detector Characterization Project in the Independent Detector Testing Laboratory Don Figer, STScI/JHU January 9, 2003 AAS 201 Seattle, WA

2 Detectors Are Important for JWST
0.1 1 10 Wavelength [mm] Signal [e-/sec/pix] Zodiacal Light Sunshield JWST requirement JWST goal R=5 R=1000 1 2 3 4 6 8 Read noise per exposure [electrons] Duration of DRM NIR Observations [yrs] Images Spectra Dark current = 0.126 e - /sec 0.020 e 0.003 e

3 JWST NIR Detector Requirements

4 IDTL Role in JWST Detector Program

5 Past and present personnel
Eddie Bergeron Data Analyst Tom Reeves Lab Technician Robert Barkhouser Optical Engineer Mike Telewicz Intern Bernie Rauscher Project Scientist Utkarsh Sharma Graduate Student Gretchen Greene Mechanical Engineer Steve McCandliss JHU Lead Ernie Morse Data Analyst Monica Rivera Intern Scott Fels Intern Don Figer Director Russ Pelton Technician Sito Balleza Systems Engineer Mike Regan System Scientist

6 Controller Electronics
IDTL Test System Controller Electronics Dewar Entrance Window Vacuum Hose He Lines

7 Hawaii 1R with 5.0 mu Cutoff

8 Rockwell & Raytheon 2K Devices

9 IDTL Measurements: Dark Current
Lowest measured dark current is ~0.006 e-/s/pixel.

10 IDTL Measurements: Read Noise
Read noise is ~10 e- for large number of reads. (system read noise is ~2.5 e-)

11 IDTL Measurements: Gain

12 Hawaii 1R with 5 um Cutoff

13 IDTL Test System

14 IDTL Measurements: AQE
QE measurements have an accuracy of ~10%.

15 IDTL Measurements: RQE
Relative QE maps show significant variations across field

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