D. Rosenthal

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GeGa Detector Performance Tests

• D. Rosenthal

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Goal Measurement of detector performance
independent of CRE performance

• Responsivity, NEP, and quantum efficiency
  measured
• in two test phases -gt PACS-ME-TR-001, -003
• Detector design,
• i.e. detector material, light cones, and
  cavity design
• verified by measurement of quantum efficiency

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• TIA with thermally decoupled JFET ( 50 K) used
• cold black body (50200 K), mesh filter
  (lcenter190 mm,
• FWHM50 mm)

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Results

• Measurement of responsivity, NEP and
• quantum efficiency at
• Pph3x10-13, 1x10-12, and 3x10-12 W and
• Tmodule 1.8, 1.85, 1.9, and 1.93 K
• Responsivity for 13 of 16 pixels of EM 6
• NEP and QE for 10 of 16 pixels of EM 6

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responsivity uniform selection by room
temperature resistance applicable
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Results of 22 individual measurements averaged

• NEP background limited for bias gt 30 mV
• average quantum efficiency 35

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Conclusion
average quantum efficiency of 35 -gt better
than specification (gt30) -gt verification of
optical design (light cones, cavity),
mechanical design (stressing mechanism),
and detector material
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