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FPU Thermal Qualification, Status and Plans for FM

FPU Thermal Qualification, Status and Plans for FM. PACS IQR. MPE J. Schubert. Content. PACS Thermal Mathematical Model PACS FPU Thermal Behavior ILT. PACS Thermal Mathematical Model. Update of the PACS TMM performed, 31th August 2004

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FPU Thermal Qualification, Status and Plans for FM

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  1. FPU Thermal Qualification, Status and Plans for FM PACS IQR MPE J. Schubert FPU Thermal Qualification Status

  2. Content • PACS Thermal Mathematical Model • PACS FPU Thermal Behavior ILT FPU Thermal Qualification Status

  3. PACS Thermal Mathematical Model • Update of the PACS TMM performed, 31th August 2004 • HERSCHEL PACS Thermal Analysis, PACS-KT-AN-003, Issue 6 • New Cryostat-TMM (Issue 4) • New Cooling Strap Design • Measured Contact Conductances • Dissipation of Grating, Filter Wheels • Update of Linear Couplings (0.3 K stage) • HERSCHEL PACS Cool-Down Analysis, PACS-KT-TN-016, Issue 2 • Reduced Instrument TMM (delivered to ASTRIUM) • HERSCHEL PACS Description of Reduced Thermal Model, PACS-KT-TN-016, Issue 2 FPU Thermal Qualification Status

  4. PACS Thermal Mathematical Model • I/F Temperatures Cooler Req. Evap: 1.85K Req. Pump: 10K OB Req. 12K @ no load Sepct.Det. Req. Red: 1.75 K FPU Thermal Qualification Status

  5. PACS Thermal Mathematical Model • Heat Flow Thermal Analysis Issue 6 Issue 5 • Manly minor changes compared to previous TMM results FPU Thermal Qualification Status

  6. Spectrometer Operation Photometer Operation FPU Thermal Qualification Status

  7. PACS Thermal Mathematical Model Slightly lower almost unchanged FPU Thermal Qualification Status

  8. PACS Thermal Mathematical Model lower FPU Thermal Qualification Status

  9. PACS Thermal Mathematical Model lower or unchanged FPU Thermal Qualification Status

  10. PACS Thermal Mathematical Model slightly lower or unchanged FPU Thermal Qualification Status

  11. PACS Thermal Mathematical Model lower FPU Thermal Qualification Status

  12. PACS Thermal Mathematical Model lower FPU Thermal Qualification Status

  13. PACS FPU Thermal Behavior ILT • Cooler Recycling run successful and frequently performed • Tilt of cryostat 20 degree, evaporator temperature 1.63K, L0 tank at 1.55KL1 tank at 4.2K • Recycling performed within < 2h • Nominal operational temperature reached • Bolometer operational for > 48h FPU Thermal Qualification Status

  14. PACS FPU Thermal Behavior ILT • During all PACS ILT instrument operations, the specified temperatures were never exceeded • Dedicated test program have been run during ILT: FPU Thermal Behavior AVM/CQM ILT, PTD 0.7.1 • - to determine temperature upper limits during heat dissipation • - to measure temperature transients in the individual FPU subunits, • - to assess overall thermal conductances and heat fluxes, • - to verify proper thermal strapping to cryogenic cooling loops • During the various tests, the L0 and L1 related temperatures inside the FPU met the requirements and did not exceed limits specified for proper operation. • No thermal anomalies inside the FPU CQMor in its connection to the different cooling levels are present … except FPU Thermal Qualification Status

  15. PACS FPU Thermal Behavior ILT • Activation of the heater on the blue detector array did not raise the temperature as much as expected (+0.7K). • Problem very likely triggered by the strong thermal conductance to the LO cooling strap we have to heat against (not confirmed yet) • Additional cool down necessary to confirm, as for the ILT we decided not to install the thermal shim at the FPU L0 I/F to the blue detector • For comparison, two SST shims are installed for the upcoming EQM test • Further cool downs with the FM might be necessary to find the final shim configuration FPU Thermal Qualification Status

  16. Open Work and Planning • Not all ILT test results available yet • Results of the ILT will not be fully representative due to different temperature boundary conditions, different concept of the PACS test cryostat and its cooling straps • Final validation of the TMM can only be done during satellite level testing (PFM phase) FPU Thermal Qualification Status

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