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CSA Optical Design CSA pre-CDR 20 March 2003, SRON-Utrecht Willem Jellema

CSA Optical Design CSA pre-CDR 20 March 2003, SRON-Utrecht Willem Jellema Space Research Organization Netherlands (SRON) W.Jellema@sron.rug.nl. 4w ray fan in HBB optical path. 1 st aperture. 2 nd and 3 rd aperture. SMIR. Potential area of truncation. M5. CMIR. HBB aperture. M6. .

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CSA Optical Design CSA pre-CDR 20 March 2003, SRON-Utrecht Willem Jellema

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  1. CSA Optical Design CSA pre-CDR 20 March 2003, SRON-Utrecht Willem Jellema Space Research Organization Netherlands (SRON) W.Jellema@sron.rug.nl

  2. 4w ray fan in HBB optical path 1st aperture 2nd and 3rd aperture SMIR Potential area of truncation M5 CMIR HBB aperture M6  Offner axis • is referred to as “pivot rotation” around offset rotation point on the Offner axis M7

  3. Random sampled rays in a 4w ray fan with Gaussian apodisation 3 2 4 5 6 1 7 y M5 x

  4. Random sampled rays in a 4w ray fan with Gaussian apodisation 1st aperture 1 2 3 4 5 6 7 SMIR 7 mm ! HBB aperture 22 mm

  5. Perspective view HBB path for all bands 1st aperture 2nd and 3rd aperture 7 1 SMIR CMIR HBB aperture

  6. 1st aperture 2nd and 3rd aperture SMIR M5 M4 CBB path band 1 M6 M8 M7

  7. CBB path all bands 1st aperture SMIR 1 2 3 4 5 6 7

  8. Perspective view CBB path all bands 1st aperture 2nd and 3rd aperture 7 1 SMIR

  9. Coherent beam propagation results • Band 1 most critical: • longest  • Gaussian beam size at SMIR  6 • Diffraction features most pronounced

  10. SMIR x Lateral throw of  7 mm needed at SMIR for mutual spillover of  1%

  11. 10.4 for HBB 8.4 for CBB

  12. 98.4 / 99.2 K For all other bands: Thot > 99 K or HBB > 0.99

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