optical & mechanical i/f between safari and iob rev. a mar. 12 th 2010 hideo matsuhara
TRANSCRIPT
Optical & Mechanical I/F between SAFARI and IOB
Rev. A Mar. 12th 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. 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.
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
[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Note: structures of MIRACLE, MIRMES, MIRHES & FPC, SCI in these figures are now out-of-date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
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 arcmin2 FoV FPC-G optics is under revision, FPC-S is already fixed
New SCI design
Field-of-Views (updated 11 Mar. 2010)
Issues for SAFARI – interference with FPC-S
SCI
FPC-S
Current optical rays at pick-off
SAFARI
175mm f
Note: MIRACLE optics / pick-off will be updated soon
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?