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SITR: FORCAST

SITR: FORCAST. February 19, 2010 Cornell University. Herter. FORCAST Status. FORCAST is up and running in lab at DOAF! Kudos to the FORCAST team George Gull, Chuck Henderson, Justin Schoenwald Joe Adams, Luke Keller Schedule 2/05 Fri Shipped via FedEx Custom Critical

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SITR: FORCAST

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  1. SITR: FORCAST February 19, 2010 Cornell University Herter

  2. FORCAST Status • FORCAST is up and running in lab at DOAF! • Kudos to the FORCAST team • George Gull, Chuck Henderson, Justin Schoenwald • Joe Adams, Luke Keller • Schedule • 2/05 Fri Shipped via FedEx Custom Critical • 2/07 Sun Arrived at DOAF parking lot • 2/08 Mon Unpack & prep for cool down • 2/10 Wed FORCAST to LN2 • 2/11 Thu FORCAST to LHe • 2/12 Fri Full cold soaked, working nominally • 4/07 Wed Start of mini line-ops • 4/23 Fri TA Characterization/First Light Flight

  3. Most Procedures in Place • Signed off • Vacuum and Leak Check • Warm Test • Cold Test • CWR Installation • PI Rack Installation • On-Aircraft Cryogen Fill • CWR Removal • Not yet signed • Safe to Mate • In-flight access • Operational • Mini line-ops plan • First light plan • Line ops plan Airworthiness document signed off as well.

  4. Photos: Loading for Shipment

  5. Photos: In DAOF lab Pump out Cooling down Calibration box Electronics

  6. Lessoned Learned • In general, everything has gone rather well • Chris has done a great job in outfitting the lab • Tools, pumps, etc • But check your H/W and tools: do you have specialty items? • No H/W stock room (nuts, bolts, etc) • No real problems with Safety and QA • Mainly in observational mode, updating procedures • Remember safety shoes • You can’t roll crane under load • Make sure you load certify your cart! • Operational issue • Access to instrument/lab requires planning • Must have 2 team members + 1 USRA person present

  7. Optimizing FORCAST Ssrc = source photon rate Sbck = background (ph/sec/pix) t1 = 1/ (frame rate) npix = source area (in pixels) RN = read noise S/N = signal-to-noise (one read) • Tweaks to optimize signal-to-noise ratio • Bias: Can increase hG (good) and bG (bad) • Chop frequency: Influences1/f noise contributions • Frame rate: Affects read noise contribution • Mux gain: Affects read noise contribution (high/low capacitance – low cap best) • Optimization depends upon background photon flux • bG is both bias and background dependent

  8. Fore Optics • Simulate on-sky (faint) source • Chop and “Nod” • Set and regulate source DT (e.g. DT = 2 K) • Checks system with “real” source • Warm & cold throughput

  9. Optimizing Bias • Upper left: S/N vs. bias for LWC low capacitance (low background) mode • 30 micron + neutral density filter • Upper right: S/N vs. bias for LWC in high capacitance (high background) mode • 38 micron filter • Lower left: S/N vs. well depth for LWC hi-cap mode 6800 < sigLevel < 10700 sigLevel in DN

  10. Cornell Non-DAOF activities • Prep for new LWC detector (GFY10-11) • New fan-out board • New detector cabling • Modify test dewar for array checkout • FPGA and S/W mods for running array • Documentation updates/generation (GFY10-11) • Based on DAOF and flight results • Installation and testing of LWC array (GFY11) • Different multiplexor (and size) from current array • Response to issues arising from first light flights (GFY10-11) • Update FORCAST operations S/W • Update data acquisition procedures • Update data reduction pipeline • Miscellaneous hardware updates due to unforeseen issues?

  11. Final Comments • We’re ready to go • Plan to keep FORCAST cold for next two weeks • Further parameter optimization • Occasional “funnies” we want to track down • Testing of IMC • Fine tuning (setting of parameters, quick look <-> FORCAST communications, etc.) • Back at Cornell • Will look into digital bias control

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