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Low Energy Response on Major Space Missions Was very good at 1/4-keV on HEAO-I Einstein ROSAT

Low Energy Response on Major Space Missions Was very good at 1/4-keV on HEAO-I Einstein ROSAT Since then much poorer due to Front side CCD electrode structure UV/Optical/IR blocking filters Mirror thermal shields Much science lost: 10 6 K gas is ubiquitous — cooling minimum.

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Low Energy Response on Major Space Missions Was very good at 1/4-keV on HEAO-I Einstein ROSAT

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  1. Low Energy Response on Major Space Missions • Was very good at 1/4-keV on • HEAO-I • Einstein • ROSAT • Since then much poorer due to • Front side CCD electrode structure • UV/Optical/IR blocking filters • Mirror thermal shields • Much science lost: 106 K gas is ubiquitous — cooling minimum.

  2. 38 mm clear diameter 350 µm pitch mesh 5 mm pitch backing mesh 95% open Ion-implanted deicing heater All Si — light and stiff

  3. 20 nm Al/50 nm polyimide ~1 p.s.i. breaking

  4. New XQC Sounding Rocket Flight 6 x 6 4mm2 pixels

  5. Still not as good as you’d like — Microcalorimeters viewing 300 K over large solid angle need 10–9 attenuation from  ~2 µm to 2 cm. Requires 100 nm of Al if divided into 5 separate tilted filters. Microcalorimeters would be badly-needed improvement in detectors for vacuum UV through EUV. Best solution is waveguide-below-cutoff filter. Need someone who understands E&M and surface plasmons!

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