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SWCam PDR detector thoughts

SWCam PDR detector thoughts. GJS / CDD 2014 Apr 9. Needed for PDR. d emo of sufficiently low NEP optical at 350 m m Assume this is sufficient demo for 450 m m also. c redible evidence of meeting requirements on total number and yield (>80% of detectors have required performance)

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SWCam PDR detector thoughts

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  1. SWCam PDRdetector thoughts GJS / CDD 2014 Apr 9

  2. Needed for PDR • demo of sufficiently low NEPoptical at 350 mm • Assume this is sufficient demo for 450 mm also. • credible evidence of meeting requirements on total number and yield (>80% of detectors have required performance) • 850 um: • very credible paper design • Likely to have a lab test before PDR, but I don’t think we would hold up PDR for NEP, if the paper design really is credible. • 2 mm: credible paper design • Will ask around to get a sense of where optical measurements are likely to be by then. • complete (but preliminary) design of focal plane packaging that is credible • Lab test of any new required technologies (e.g., cabling). • credible cost and schedule estimate • complete (but preliminary) design that demonstrates that all this can be accommodated in cryostat, read out, archived, and calibrated.

  3. 2 mm • TiN: • empirical: Response looks normal at 1.2 mm. • theoretical: n >~ kTC/h = 21 GHz (TC/1 K) • (Missing a prefactor of order unity.) • Al: • empirical: NIKA instrument uses Al LEKIDs at 2.1 mm.

  4. PDR Timing • MAKO2 run should conclude in mid September. • It would be nice to have a little time to do some further lab measurements afterward. • PDR no earlier than November?

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