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Ch. Hartinger / L. Barl

Ch. Hartinger / L. Barl. Ge:Ga Detector Arrays. Overview. Performance results of FM HS Modules Status of the LS & HS Array Integration. FM HS Modules. 8 Test Runs (32 modules) MPE Test Equipment Improvements 10 filter capacitors at the connector distribution panel inside the cryostat

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Ch. Hartinger / L. Barl

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  1. Ch. Hartinger / L. Barl Ge:Ga Detector Arrays MPE - Ge:Ga Detector Array

  2. Overview • Performance results of FM HS Modules • Status of the LS & HS Array Integration MPE - Ge:Ga Detector Array

  3. 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 < 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 MPE - Ge:Ga Detector Array

  4. Cold Performance Test Dark current • Background of 4.2 K corresponds to a flux < exp(-18) W/pixel MPE - Ge:Ga Detector Array

  5. Cold Performance Test Dark current • Strong variation between modules MPE - Ge:Ga Detector Array

  6. Cold Performance Test Noise Equivalent Power (NEP) • The modules behave very similar up to a bias of 70mV, where the sensitivity is maximal • The NEP is strongly dependent on the flux MPE - Ge:Ga Detector Array

  7. Cold Performance Test Responsivity • The responsivity varies by more than a factor 3 for different modules • The arrangement in the detector array was chosen according to the responsivity MPE - Ge:Ga Detector Array

  8. HS Integration Distribution of the Responsivity in the TEL Focal Plane The modules with the high values were positioned at the center of the array MPE - Ge:Ga Detector Array

  9. Cold Performance Test Homogeneity of the Responsivity FM190: strong gradient FM174: almost homogeneous Each module has its own characteristic distribution not caused by an inhomogeneous flux MPE - Ge:Ga Detector Array

  10. The test optics delivers a nearly homogeneous flux distribution Cold Performance Test Reproducibility of the measurements 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) MPE - Ge:Ga Detector Array

  11. HS-Detector Status HS-Modules Status after Integration • 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 MPE - Ge:Ga Detector Array

  12. HS-Detector Status Arrangement of the HS-Modules Front view of the HS-detector MPE - Ge:Ga Detector Array

  13. LS-Detector Status Arrangement of the LS-Modules • 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) MPE - Ge:Ga Detector Array

  14. P Mechanical Parts P Blackened Baffles P Cable Mount BD P 4K Post BD P Integration Tool BD P HP Heater P Harness P Flasher P Sapphire P Filter FLBS P 25 Detector Modules P Suspension Feet P Mechanical Design Blue Detector Array Distribution BD P Cooling Strap BD KT MPE ASTEC QMC J.B. Integration Status FM Blue Detector Assembly – Integration Status FM PACS Blue Detector Array MPE - Ge:Ga Detector Array

  15. P Housing Frame Baffle Frame P Mechanical Parts Flat Mirror Baffling System Blackened Baffles 2K Cooling Stap I/F Sapphire P Mirror Red Detector P P Cable Mount RD P 4K Post RD P Integration Tool RD HP Heater P Filter P Harness Filter Baffles P Flasher Filter Mount (5 Stripes) P Sapphire Filter FLRS1 RD P 4K Cooling Staps P FM PACS Red Detector Array 25 Detector Modules Detector Modules with FO Clamping Device P Suspension Feet P Distribution RD Mechanical Design Red Detector Array KT MPE ASTEC QMC J.B. Cooling Strap RD P Filter FLRS2 Pupil RD Integration Status FM Red Detector Assembly – Integration Status MPE - Ge:Ga Detector Array

  16. Work in Progress • Bake out at 80°C for 3 days • Final inspection prior to delivery to KT • Warm functional test after cold vibration test MPE - Ge:Ga Detector Array

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