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Mount structure concept

July 17-2009 KHANH. 1) Aluminum structure. 2) Structure design for holding Newport mirror mount because of its compact. 3) FM1 assy can be manually adjusted in vertical direction. 4) FM2 assay can be adjusted in horizontal direction. Mount structure concept. FM1.

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Mount structure concept

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  1. July 17-2009 KHANH 1) Aluminum structure. 2) Structure design for holding Newport mirror mount because of its compact. 3) FM1 assy can be manually adjusted in vertical direction. 4) FM2 assay can be adjusted in horizontal direction. Mount structure concept FM1 FM1 & FM2 Mount structure design )versized base plate for ease of clamp On the bench Newport mirror mounts with 6” mirror FM2

  2. FM1 & FM2 Mount structure design Displacement analysis The displacement of the structure is greatest when it is in horizontal position as shown. The flexure analysis is only focus on the FM1 mounting shaft, which has the greater distance from the base. Empty structure weight : 10.5 lbs Each mirror mount assy weight : 8 lbs max. (assy includes mirror, Newport mount, mount bracket and shaft) • - Structure constrain at the base (no translation) • Entire structure (includes FM1 & FM2 assy) • under gravity. • Displacement result: • FM1 mounting shaft displacement relative • to the fixed base : • .009 mm (linear) • 0.0015 (rotation) = 5.4arc sec • With the allowable flexure of 10arc sec,the • structure‘s stiffness is acceptable. FM2 mounting shaft FM1 mounting shaft

  3. Mirror holder modification Newport P/N 625-RC6 1) Component replacement: • T increase the stiffness of the mirror mount, The compression • Spring must be replaced with higher spring rate. • Existing spring rate : 9 lbs/in • - New spring rate 17.7 lbs/in 2) Structure modification 3 Retainer are mounted on the shell of Newport mirror mount, which can rotate around the screw to clamp or Release the mirror. These retainers are totally clear of an required aperture. Area represents the required Aperture of 116mm in diameter Spring plunger with nylon ball tip 1.5 to 3 lbs load Retainer in mirror holding position Retainer in position for mirror release

  4. Because of space constrain.some • Conditions must be met: • Compact design of the mirror mount • adaptor assy. • Vertacal orientation of the mirror mount. FM3 Mount structure design 8” Mirror mount Photosigma #112-4460

  5. FM3 Mount flexure Gravity in Z-dir Z Y Gravity in X-dir X

  6. FM3 Mount flexure Gravity in X-dir Gravity in Z-dir Flexure in X-dir Flexure in Z-dir Unit in [arc sec] Mount structure weight : 9.4 lbs Optosigma mirror mount weight : 4.9 lbs 8” mirror estimate weight : 4 lbs

  7. HOWFS/ACam Partial HOWF assy is shown

  8. HOWFS/ACam Collimating mirror mount #2 Lens mount (CO1) Focus camera assy (shown with dark cover) Adaptor plate By using adaptor plate,the entire optical assembly can be installed or removed from the stage without disturbing an optical alignment.

  9. HOWFS/ACam Dark cover structure Main dark cover Snap-in rubber profile for light seal

  10. HOWFS/ACam Focus camera assy lay-out Dark cover Camera assy Pins installed to ensure the repeatability of the camera assy CCD50 Array lens #1 Adjustment knobs will be replaced With low profile hardware

  11. HOWFS/ACam Flexure of the optical components of the focus camera assy X Gravity in Y-dir Gravity in Z-dir Y Z Camera weight = 3 lbs Array lens assy : 1 lb max

  12. HOWFS/ACam Flexure of the main optic mount struture Boundaries: Loads apllied to the maun structure as follow: *1 : Focus camera assy = 15 lbs *2 : Lenslet assy with stages = 4 lbs *3 : Acam. Lens mount assy with stage = 4 lbs *4 : Field lens mount assy = 1 lb *5 : Acam M2 assy = 1 lb X Y Z *1 *4 *2 *3 *5

  13. Flexure of the main optic mount struture Deflection of the focus camera assy in Y-dir under gravity Max. allowable flexure 1.2 µm = 0.1 arc sec/hr From FEA : 0.27 µm = .022 arcsec /hr

  14. HOWFS/ACam Total flexure of Optic mount struture Total flexure of MPA-CC stage Total flexure of UTS50 stage Total flexure of ATS150 stage + + + .012 arcsec .05 arcsec ? ≤ 0.1 arcsec/hr (Z-dir) .0184 arcsec (Y-dir) .0164 arcsec

  15. HOWFS/ACam Field stop assy using existing components Adjustment direction Adjustment direction Cut for clearance

  16. HOWFS/ACam Work progress: - All fabrication parts are released . - Assy drawing completed and checked into the vault - Need stage #461-XYZ-LH-M and actuator #AJS100-0.5 ARE ON ORDER Field stop assy usung XYZ stage Direction of adjustment of mirror Direction of adjustment of mirror Newport XYZ stage Direction of adjustment Of mirror

  17. HOWFS/ACam Field stop assy usung XYZ stage Field stop assy

  18. HOWFS/ACam Main dark cover design and installation Main dark cover with Captive hardware Sliding posts Baffle tube (part of the dark cover) To prevent the dark cover from striking the fold mirror assy during an installation of the cover,two long posts are mounted in place as shown for the cover to slide Down. The dark cover will be engaged with the posts first before sliding past the fold mirror assy .

  19. HOWFS/ACam Top view of the optical bench

  20. DM 3368 DM holding frame assy Weight :8.6 lbs Frame shown with DM assy in place Design concept

  21. DM 3368 Flexure analysis X Y X Block to represent the DM3368 assy for analysis (weight approx. 21 lbs)

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