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Overall PACS EQM IMT Analysis Contributions by PACS ICC

Overall PACS EQM IMT Analysis Contributions by PACS ICC. PACS EQM IMT Contents. Short Functional Test (SFT) warm (3 x) ~ 1h Short Functional Test (SFT) cold HeII (not done) (~ 1h) PACS Integrated Module Test: Full Functional Test (FFT) 7.7h

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Overall PACS EQM IMT Analysis Contributions by PACS ICC

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  1. Overall PACS EQM IMT AnalysisContributions by PACS ICC PACS Overall Analysis

  2. PACS EQM IMT Contents • Short Functional Test (SFT) warm (3 x) ~ 1h • Short Functional Test (SFT) cold HeII (not done) (~ 1h) • PACS Integrated Module Test: • Full Functional Test (FFT) 7.7h • Short Performance Test (SPT) 12.8h • AOT Test 9.7h • EMC Test (Spec+Phot) ~ 5d • Separate, joint SPIRE/PACS procedure: • PACS/SPIRE Parallel Mode Test (PACS part) ~4.7h • Extra straylight tests (~3d) • Short Functional Test (SFT) cold HeI ~ 1h 21-22 Nov 2005 H-Field Tests incl. threshold measurements 23-25 Nov 2005 E-Field Tests PACS Overall Analysis

  3. Available Reports/Notes • 3 reports on short functional tests warm • 1 report on short functional test HeI • Performance test of PACS chopper and duty cycle • Internal calibration sources performance tests • Cryostat background adjustment • Emissivity/RSRF on internal calibration sources • Function and performance of PACS grating • Performance test PACS Photometer filter wheel • Ge:Ga detector dark current test on cold internal calibration sources • Ge:Ga bias loop tests and detector performance • Dead/suspicious pixel maps from RSRF, bias loop and dark current tests • Ge:Ga time constants for flux changes • Low frequency noise measurements of the bolometer • Photometer FOV maps • Summary note on AOT related tests PACS Overall Analysis

  4. Warm Electronics and OBSW • SPU-L failure: loose FPGA •  removed, repaired and re-installed • DPU AVM1 failure: broken inductor •  removed and repaired, exchange with CFM2 but that one • generated corrupted output only  re-installed AVM1 • SPU OBSW: upgraded from V11.1 to 11.7 to prevent IMT data • losses due to a known bug, detected during ILT • SPU OBSW: Data rate / CPU workload too high (as expected from ILT) • DPU HW/OBSW: Few known and new bugs detected, but no major • show-stopper (Corrupted packet checksums, duplicate HK packets, SSC • discontinuities) • BOLC: 20Hz command had unexpected impact on supply groups PACS Overall Analysis

  5. Test Results (1) • Chopper • duty cycle: comparable to ILT (but too small) • noise: slightly worse than in ILT, but still in spec. • Slight angular offset detected: contact with housing has been • removed after the ILT PACS Overall Analysis

  6. Test Results (2) • Calibration sources • Nominal performance: total heating time and stability in spec Fluctuations =  50 units Spec.= 7mK =  70 units PACS Overall Analysis

  7. Test Results (3) • Grating: Suffered from a DMC FPGA problem(introduced after ILT) Excessive noise on position readback Spontaneous grating controller self-disable PACS Overall Analysis

  8. Test Results (4) • Photometry Filter Wheel • nominal performance, transition time even slightly shorter • than in ILT Position A Position B PACS Overall Analysis

  9. Test Results (5) • Temperature sensors: • nominal performance for all but the two blue detector sensors • 1 sensor was recovered, apparently a contact problem on • a DMC connector • Blue detector heater: • - o.k. (but thermal shimming to be improved) • Optical performances: • - no particular tests done, since no telescope/OGSE available • - straylight • - FoV maps do not indicate any other problem PACS Overall Analysis

  10. Test Results (6) • Ge:Ga Detector performance: • IMT performance similar to ILT • Differences due to other background conditions: absolute • level and stability • - Lost a number of pixels Rint=64, Cint=0.3pF Rint=64, Cint=0.3pF PACS Overall Analysis

  11. Test Results (6) • Ge:Ga Detector performance: • - Lost a number of pixels Blue array : - 2 new high noise pixels Red array :- 7 new dead pixels - 5 new high noise pixels - 1 dead pixel in ILT seems to react better to flux again, but very noisy. PACS Overall Analysis

  12. Test Results (7) • Bolometer performance: • IMT performance similar to ILT • Differences due to shorter test time and other background • conditions: absolute level and stability IMT ILT PACS Overall Analysis

  13. Test Results (8) • Bolometer performance: • IMT performance similar to ILT • Differences due to shorter test time and other background • conditions: absolute level and stability IMT ILT PACS Overall Analysis

  14. Further Tests • Not reported in this presentation: • - Optimum Ge:Ga detector Bias • - S/N as a function of reset interval • - Emissivity of calibration sources • - Quick wavelength check (several executions failed, one was • successful) • - Memory Management • - SAFE mode transition • - Non-Prime PACS Switch-on • - Bolometers Saturation check • - Detector selection table test • - Compression/Reduction Modes Test (Phot & Spec) • - Time constants for flux changes in spectroscopy • Failed Tests: (due to grating problem) • - Grating relative spectral response function • - Emissivity of calibration sources (failed partly) • - Medium sampling grating test PACS Overall Analysis

  15. AOT Tests (1) • Overview: • Spectroscopy “TuttiFrutti” AOT ( o.k.) • Photometry “TuttiFrutti” AOT ( o.k.) • [Test of all AOT relevant OBCPs, verification of PACS sub-unit synchronisation and building blocks for real AOTs] • Spectrometer Line Scan AOT • - Calibration blocks concepts • - Line scan concepts • - Frequency switching concepts • Spectrometer Range Scan AOT • Photometer AOT • - Calibration block concepts • - Nominal photometry concepts • - Photometry in PACS/SPIRE parallel mode PACS Overall Analysis

  16. AOT Tests (2) • Consolidated set of AOT performance tests established for future • test campaigns • Although the AOT tests are highly valuable, not everything could • be tested: pointing modes, space environment effects, no • external sources • Report on “AOT related test during the EQM IMT” is in • preparation, results to be presented at next PACS ICC Feb 23/24 PACS Overall Analysis

  17. PACS/SPIRE Parallel Mode Test (1) Concept: - “Shifted” (by ~25-30min.) cooler recycling - SPIRE activities - Thermal behaviour test (with SPIRE on in parallel) - Two test cases: Single and Dual band photometry - Only Line Scan AOT option tested - Dual band: blue LW, double compression red, nominal compression - Single band: only red channel, nominal compression - 15 TM packets per sec available for PACS  data rates: PACS ~72 kbit/s SPIRE ~57 kbit/s PACS Overall Analysis

  18. PACS/SPIRE Parallel Mode Test (2) • Results: • Thermal behaviour: o.k. • Single band photometry: o.k. • Dual band photometry: Bug in CUS script, double reduction in • blue channel has been set unfortunately to nominal again •  Data loss due to violation of bus bandwidth, however correctly • handled by DPU. • Overall: Successful as seen by PACS •  next steps to be carried out elsewhere (CUS, HSPOT…) PACS Overall Analysis

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