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Characterization of 1.7um cutoff detectors for SNAP

Characterization of 1.7um cutoff detectors for SNAP. Roger Smith Caltech. SuperNova / Acceleration Probe. A 2m class wide field survey telescope in L2 orbit…. …will use supernovae and gravitational lensing to begin to unravel the mysteries of Dark Energy and Dark Matter.

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Characterization of 1.7um cutoff detectors for SNAP

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  1. Characterization of 1.7um cutoff detectors for SNAP Roger Smith Caltech Scientific DetectorWorkshop, 2005 Taormina

  2. SuperNova / Acceleration Probe A 2m class wide field survey telescope in L2 orbit… …will use supernovae and gravitational lensing to begin to unravel the mysteries of Dark Energy and Dark Matter.

  3. SuperNova / Acceleration Probe No cryogens Precision photometery … <2% error, including systematics

  4. Guiders (4) 36 NIR Detectors 3 bandpasses Spectrograph slit 560mm diameter 36 CCDs, 6 bandpasses Mixed CCD and NIR focal plane • 36 x 2Kx2K NIR arrays • 1.7um cutoff • Radiative cooling to 120-140K • 3 NIR bandpasses • Fixed filters • 18-20um pixels under-sample diffraction profile Caltech U.Michigan IDTL JPL GSFC

  5. Smaller telescope, cheaper mission SNAP Spec. QE Without AR Coating RSC RSC WFC3-094 SUBSTRATE REMOVED (DCL) Substrate removed with 1.7um AR coat

  6. Intra-Pixel Response[Total signal from 5um spot, vs. position] HgCdTe Raytheon Rockwell

  7. Dark Current vs T

  8. CDS noise

  9. Fowler Sampled noise (spatial)

  10. Cosmic Rays Raytheon HgCdTe Single 1000s dark (CDS) Rockwell HgCdTe Difference of 1000s darksFowler 32, 80K

  11. Best efforts so far… * Manufacturer’s measurement

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