1. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms1 FM ILT Results: Mechanisms H. Feuchtgruber, H. Dannerbauer, N. Geis, C. Hartinger, U. Klaas, P. Royer

2. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms2 Overview of Sub-systems - Grating Launch Lock - Grating Mechanism - Chopper - Filter Wheel SPEC - Filter Wheel PHOT - Calibration Sources CS1, CS2 - Heater Blue and Red - Flasher Blue and Red

3. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms3 Test Phases - Short Functional Tests Warm, LHeI and LHeII - Mechanism controller parameter optimization - ILT with blue spectrometer array connected to DMC - ILT with red spectrometer array connected to DMC

4. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms4 Grating Launch Lock  Opened during the SFT warm on 12-Oct-06  Closed on 4-Jan-07 (warm) 12-Oct-06 4-Jan-07

5. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms5 Grating Mechanism (1)  Results - Control loop parameters have been optimized for operation with DMC EQM - Grating health check successfully passed - Accessible range measured - Variety of scans with different step-sizes explored - Duration of step transitions and stability on position is within spec. - We plan to do still better on with the FM DMC and improved OBSW - Grating speed can be set to 4 deg/s as a compromise between small step stability vs. grating speed for large transitions.

6. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms6 Grating Mechanism (2)  Results - Control loop parameters have been optimized for operation with DMC EQM - Grating health check successfully passed - Accessible range measured - Variety of scans, different stepsizes and speeds explored - Duration of step transitions and stability on position is within spec. - We plan to do still better on with the FM DMC and improved OBSW - Grating speed can be set to 4 deg/s as a compromise between small step stability vs. grating speed for large transitions.

7. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms7 Grating Mechanism (3)  Results - Control loop parameters have been optimized for operation with DMC EQM - Grating health check successfully passed - Accessible range measured - Variety of scans and different stepsizes explored - Duration of step transitions and stability on position is within spec. - We plan to do still better on with the FM DMC and improved OBSW - Grating speed can be set to 4 deg/s as a compromise between small step stability vs. grating speed for large transitions.

8. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms8 Grating Mechanism (4)  PACS-ME-ECR-009: “Expansion of grating angular throw” - CQM: 40.6 degrees; insufficient accessible wavelength range - FM: accessible range = 44.62 degrees working range = 43.1 degrees (low grating output) order “measured”specification [45000 – 1050000] n=3 73.2µm – 34.8 µm 72µm - 56µm n=2109.8µm – 52.2µm 105µm - 72µm n=1219.6µm – 104.3µm 210µm - 105µm

9. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms9 Grating Mechanism (5)  Problems: - Limit switch at “positive” end is broken (NCR-ME-229) - Non-optimum software handling of grating open loop operation (corrected in latest DMC OBSW) - Grating position information was lost when turning the filter wheel (corrected in latest DMC OBSW, SPR-0651)

10. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms10 Chopper (1) Duty cycle of chopper has been within specification at sub- system level Chopper performance is coupled to DMC capabilities Control loop optimization hasn’t been completed due to NCR-233 Requirements for science operations: deviations from final position 80% @10Hz Requirements for calibration operations: deviations from final position 70% @10(5)Hz

11. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms11 Chopper (2)

12. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms12 Chopper (3) Science FOV Measured: - up = 13ms - down = 34ms Specification: 10ms Need for asymmetry Parameters in control loop identified

13. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms13 Chopper (4) Calibration FOV Measured: - up = 33ms - down = 60ms Specification: 15(30)ms

14. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms14 Chopper (5) Non-conformance: PACS-ME-NCR-233  Chopper has been de-integrated, further investigations ongoing, replace by original FM chopper DMC OBSW modifications defined

15. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms15 Filter Wheels (1)  Both wheels turned during all test phases, at warm and cold temperatures without any problems. Positional reproducibility of FW PHOT is within specification, FW Spec positional accuracy is not yet determined due to bug in commanding script (corrected in the meantime). However there are no indications that it may not be in spec.

16. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms16 Filter Wheels (2)  Both wheels turned during all test phases, at warm and cold temperatures without any problems. Positional reproducibility of FW PHOT is within specification, FW Spec positional accuracy is not yet determined due to bug in commanding script (corrected in the meantime). However there are no indications that it may not be in spec.

17. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms17 Calibration Sources (1)  Time constants  Homogeneity  Emissivity

18. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms18 Calibration Sources (2)  Time constants - Complete tests not carried out. - Heat-up from off-state to 70.5(CS1)/76.5(CS2) K - Measurements are done in spectroscopic HK mode t(70.5K) = 2700sec t(76.5K) = 3100sec Worse than req. (Stable after ~30min), but only slightly different from CQM

19. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms19 Calibration Sources (3)  Time constants - Complete tests not carried out. - Heat-up from off-state to 70.5(CS1)/76.5(CS2) K - Measurements are done in spectroscopic HK mode t(70.5K) = 2700sec t(76.5K) = 3100sec Stability in spec. Worse than req. (Stable after ~30min), but only slightly different from CQM

20. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms20 Calibration Sources (4) - Complete tests not carried out. - Heat-up from off-state to 70.5(CS1)/76.5(CS2) K - Measurements are done in spectroscopic HK mode t(70.5K) = 2700sec t(76.5K) = 3100sec  Time constants Stability in spec. Worse than req. (Stable after ~30min), but only slightly different from CQM

21. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms21 Calibration Sources (4)  Homogeneity CS2CS1

22. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms22 Calibration Sources (5)  Homogeneity: FOV = OGSE BB1 at 22K  Significantly improved since CQM, however there is still some small structure on top CS2 76.5K CS1 70.5K Straylight issues to be investigated still !

23. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms23 Calibration Sources (6)  Emissivity CS2 (~76K) - Measured against cryogenic OGSE blackbody at 30K - Values are within specified range, however change from CQM to FM not effective - The analysis did not yet include straylight effects and accurate temperature derivation for CS2 - The OGSE BB was not measured at consistent chopper positions CQM values for CS2

24. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms24 Heater Blue & Red  Both heaters passed the functional tests  2 different current settings during SFT warm

25. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms25 Heater Blue (1)

26. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms26 Heater Blue (2) IID-B Spec. expected optimum

27. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms27 Heater Blue (3)  Detector curing test: I h =10mA

28. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms28 Flashers Blue & Red (1) bluered blue red Nylon suspensionsCopper wires Brass wires Emitter

29. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms29 Flashers Blue & Red (2) bluered Short functional tests passed

30. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms30 Flashers Blue & Red (3) Blue @ 0.7mARed @ 0.4 mA Measure a sequence of flasher currents to check illumination pattern (up into saturation)

31. PACS SVR 2 18 Jan 2007 FM ILT: Mechanisms31 Flashers Blue & Red (3) bluered Calculated illumination pattern of the arrays (prior to cone) Including the detector cones results in significantly different “signal pattern” as seen by detector Peak signal Shadow by walls 27 46 2668 56 15 35 23 41 4 40 26 5 24