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Optical & Mechanical I/F between SAFARI and IOB

Optical & Mechanical I/F between SAFARI and IOB. Rev. A Mar. 12 th 2010 Hideo Matsuhara. Background. Stringent stiffness requirement of FPIA 150Hz (Z) / 100Hz (X, Y) !! The original concept of IOB plate (ribbed Aluminum plate) itself does not satisfy the requirement.

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Optical & Mechanical I/F between SAFARI and IOB

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  1. Optical & Mechanical I/F between SAFARI and IOB Rev. A Mar. 12th 2010 Hideo Matsuhara

  2. Background • Stringent stiffness requirement of FPIA • 150Hz (Z) / 100Hz (X, Y) !! • The original concept of IOB plate (ribbed Aluminum plate) itself does not satisfy the requirement. • To overcome the above problem, two options: • [Option A] IOB made of SiC (or CFRP) • [Option B] MIRACLE (& MIRMES, MIRHES) base plate will be a part of the IOB structure (made of Aluminum) • On the other hand, we decide to consider a common pick-off module (PoM) separated from each FPI, but mechanically I/F to IOB • PoM is a sub-system of IOBA • No moving parts • On 13th Jan, we proposed that each FPI’s envelope does NOT exist within 180f circle in the focal plane.

  3. Concept of common PoM • Pick-off location is 100-150mm below the surface of IOB, so the PoM looks like a cylinder? • IOB may not be a plate, but a frame structure – so the PoM structural design depends on the IOB structure f 2300 mm

  4. [Option B] “IOB – MIRACLE-base plate common structure” concept • Note: structures of MIRACLE, MIRMES, MIRHES & FPC, SCI in these figures are now out-of-date • This option is investigated by Takehiko Wada & the MIRACLE team on behalf of the FPIA manager

  5. Progress in the opt-mechanical design of MIRACLE, MIRMES, MIRHES, SCI and FPC • MIRACLE, MIRMES, MIRHES • 1st version of optical design completed and estimated total mass & volume • Now 2nd version of optics is under investigation , aiming more compact design - pick-off location can be slightly apart from the telescope center • MIRMES pick-off is located at the re-image of the fore-optics of MIRACLE-long • MIRHES pick-off is located at the re-image of the fore-optics of MIRACLE-short • SCI • Now, no-pickoff mirror • compact optical design in the housing oriented vertical • FPC • Now 5x5 arcmin2FoV • FPC-G optics is under revision, FPC-S is already fixed

  6. New SCI design

  7. Field-of-Views (updated 11 Mar. 2010)

  8. Issues for SAFARI – interference with FPC-S FPC-S SCI

  9. Current optical rays at pick-off 175mm f SAFARI Note: MIRACLE optics / pick-off will be updated soon

  10. Discussion – short-term A/Is • Can [Option-B] fit the SAFARI mechanical I/F design? • can SAFARI rotate 90 deg around X-axis? • Optical I/F for SAFARI will be defined with respect to the common PoM, as we proposed before?

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