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Optical Performance of SOT: Test Report for the Flight Telescope Kiyoshi Ichimoto (NAOJ) and

Optical Performance of SOT: Test Report for the Flight Telescope Kiyoshi Ichimoto (NAOJ) and SOT-Team. Optical Performance Tests of SOT:. ◇ Wavefront measurement of OTA - Initial alignment canceling the gravitation - Under the thermal condition in orbit

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Optical Performance of SOT: Test Report for the Flight Telescope Kiyoshi Ichimoto (NAOJ) and

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  1. Optical Performance of SOT: Test Report for the Flight Telescope Kiyoshi Ichimoto (NAOJ) and SOT-Team Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  2. Optical Performance Tests of SOT: ◇ Wavefront measurement of OTA - Initial alignment canceling the gravitation - Under the thermal condition in orbit - Mechanical launch loads ◇ Pointing stability against microvibration in S/C ◇ Polarization characterization Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  3. OTA flight model integration clinometer • OTA is integrated on a test tower. • Interferometoric measurement with reference flat at the top. • OTA is both in upside top and upside down to cancel gravity. Vertical meter Target mirror Reference flat Alignment cube M2 Rotation mechanism Dummy OBU OTA Interferometer MiniFiz M1 Six axis stage Telescope Up Optical bench Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  4. Initial alignment of M1,M2 and CLU OTA WFE map at T=20C uniform Average of upside top and upside down giving Zero-G WFE OTA upside top Gravitational deformation of OTA optics 20nm rms　~ l/32 rms @633nm = Strehl ~ 0.96 Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  5. OTA Optical Thermal Test:2005.3.11-20 Optical performance of OTA under the thermal condition in orbit Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  6. Optical performance of OTA under the thermal condition in orbit Difference of WFE map from T=20C uniform Cold case: Hot case M1～ +20C , upper truss ～ -30C M1～ +30C, upper truss ～ + 2C DWFE ~15nm rms DWFE ~11nm rms It is expected that when the M1 temperature reaches ~55C, the optical performance of OTA degrades to Strehl ~ 0.8 @500nm. The temperature increase of M1 is caused by contamination of M1, and the ‘mission life’ of OTA is estimated to be > 3yr, which is realized by the extensive baking of the components. Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  7. Solar-B on shake machine, Oct. 2005 Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  8. WFE before and after S/C vibration test, Oct.005 Pre-vibration Post-vibration difference - = 21.5nm rms 19.1nm rms 5.5nm rms Defocus, tile subtracted You will find more info. in poster presentations; Y. Suematsu “On the Evaluation of Optical Performance of Observing Instruments” Y. Suematsu, etal. “Optical Performance of Optical Telescope Assembly of SOT: Confirmation of Diffraction-Limited Performance” Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  9. FPP IRU-B - IRU - BOX MW IRU-A . Microvibration Transmissibility Test • There are various sources of mechanical disturbance in the spacecraft: • Momentum wheels • IRU-A & B (Gyro) • - Moving mechanisms in mission instruments To evaluate the possible pointing error of SOT, microvibration transmissibility test was performed Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  10. Image stability; SOT requirement = 0.09” (3s) = 0.042” (0-p) (sinusoidal jitter) (requirement) Strehl degradation due to optical error Strehl degradation due to image jitter psf with sinusoidal jitter, l = 390nm 0.09” (3s) Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  11. 630nm tunable laser theodolite PSD Test configuration Laser beam was induced from the OTA entrance and pointing error is measured optically. dolly Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  12. Optical layout FPP FG-CCD CT-CCD 180oBS Insertion pipe Acc. sensors Image plane PSD Data logger Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  13. Record of induced pointing error (SOT requirement = 0.03”rms) (by the PSD sensor from continuous rotation measurement, unit=arcsec rms) Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  14. Disturbance level of XRT-VLS  Final Strehl ~ 0.59 Pointing disturbance caused by XRT-VLS shutter (requirement) Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  15. OTA-FPP integrated on OBU ( 2005 May) OTA FPP OBU Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  16. Natural Sunlight Test:　 2005.6 End-to-End functional test of SOT as a magnetograph Sheet polarizer (LP, RCP, LCP) Reflected light from 2FS Heliostat window Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  17. ‘SOT Polarization Response Matrix’ X X are determined for SP and NFI with an accuracy - 0.3333 0.3333 0.2500 0.0010 0.0500 0.0067 0.0050 0.0010 0.0067 0.0500 0.0050 0.0010 0.0067 0.0067 0.0500 dX < Crosstalks among I,Q,U,V will be negligible at e = 0.1% Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  18. X matrix of SP at the scan center; CCD image each element is scaled to median + tolerance, x00 (=1) is replaced by I-image The X matrix can be regarded as uniform over the CCD and scan position. Median Mueller matrix Left CCD 1.0000 0.2205 0.0187 -0.0047 0.0012 0.4813 0.0652 -0.0014 0.0001 0.0513 -0.4803 -0.0057 -0.0025 0.0032 -0.0046 0.5256 Right CCD 1.0000 -0.2112 -0.0170 -0.0051 -0.0025 -0.4875 -0.0560 0.0022 -0.0001 -0.0426 0.4907 0.0060 0.0027 -0.0008 0.0042 -0.5301  See poster by Lites etal. Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  19. Sensitivity of NFI on polarization and detection limit of the weak magnetic field SOT is now a well calibrated polarization instrument!  See poster by Ichimoto etal. Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  20. Other verification items of the sunlight test • presented in posters • Throughput / Light level •  Shimizu etal. “Estimate on SOT light level in flight with throughput measurements in SOT sun test.” • System function as a magnetograph/Dopplergraph  Katsukawa, etal . “Calibration of SOT Dopplergrams” • Mutual alignments / image scale between SP/NFI/BFI •  Okamoto, etal. “Examinations of the relative alignment of the instruments on SOT” • Vignetting/Ghost etc. Solar-B Science Meeting, 2005.11.8-11 in Kyoto

  21. Thank you! Solar-B Science Meeting, 2005.11.8-11 in Kyoto

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