Ch. Hartinger L. Barl

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Ch. Hartinger / L. Barl
GeGa Detector Arrays
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Overview

• Performance results of FM HS Modules
• Status of the LS HS Array Integration

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FM HS Modules

• 8 Test Runs (32 modules)
• MPE Test Equipment Improvements
• 10 filter capacitors at the connector
  distribution panel inside the cryostat
• Sense lines for the VDDA, VSS, GRD, VDDr and
  Zero_bias supply lines
• Optics include only a black body, 1 mirror but no
  attenuation filters
• Stability of BB temperature is lt 1 mK
• Standard Measurements
• Warm functional test at RT checks the supply
  currents
• Cold functional test at 4 K and the output
  frames
• Cold performance test (1.85 K)
• Dark current
• Noise Equivalent Power (NEP)
• Responsivity

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Dark current
Cold Performance Test

• Background of 4.2 K corresponds to a flux lt
  exp(-18) W/pixel

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Dark current
Cold Performance Test

• Strong variation between modules

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Noise Equivalent Power (NEP)
Cold Performance Test

• The modules behave very similar up to a bias of
  70mV, where the sensitivity is maximal

• The NEP is strongly dependent on the flux

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Responsivity
Cold Performance Test

• The responsivity varies by more than a factor 3
  for different modules
• The arrangement in the detector array was chosen
  according to the responsivity

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Distribution of the Responsivity in the TEL Focal
Plane
HS Integration
The modules with the high values were positioned
at the center of the array
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Homogeneity of the Responsivity
Cold Performance Test
FM190 strong gradient
FM174 almost homogeneous
Each module has its own characteristic
distribution not caused
by an inhomogeneous flux
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Reproducibility of the measurements
Cold Performance Test
Multiple tests of modules at different positions
in the set-up
Different distribution between the two tests (FEE
exchanged, connections re-glued)
Very good reproducibility of the data points
after two tests (FEE changed)
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HS-Modules Status after Integration
HS-Detector Status

• 25 modules integrated
• 2 open pixels
• 2 pixel connections cut
• 2 calibrated temperature sensors
• (FM161 FM168)

ESD protection by aluminized cigarette wrapping
paper during the integration
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Arrangement of the HS-Modules
HS-Detector Status
Front view of the HS-detector
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Arrangement of the LS-Modules
LS-Detector Status

• 25 modules integrated
• in FM 107 FM 135 behavior of few pixels
  undetermined
• 3 open pixels
• 1 pixel connection was cut
• 2 calibrated temperature sensors
• (FM132 FM135)

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FM Blue Detector Assembly Integration Status
Integration Status
FM PACS Blue Detector Array
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FM Red Detector Assembly Integration Status
Integration Status
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Work in Progress

• Bake out at 80C for 3 days
• Final inspection prior to delivery to KT
• Warm functional test after cold vibration test