Mount structure concept FM1 & FM2 Mount structure design 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. July KHANH Newport mirror mounts with 6” mirror )versized base plate for ease of clamp On the bench FM1 FM2

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) (rotation) = 5.4arc sec With the allowable flexure of 10arc sec,the structure‘s stiffness is acceptable. FM1 mounting shaft FM2 mounting shaft

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 Spring plunger with nylon ball tip 1.5 to 3 lbs load Retainer in mirror holding position Retainer in position for mirror release Area represents the required Aperture of 116mm in diameter 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.

FM3 Mount structure design 8” Mirror mount Photosigma # 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 flexure Gravity in Z-dir Gravity in X-dir Z X Y

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

HOWFS/ACam Partial HOWF assy is shown

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

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

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

HOWFS/ACam Flexure of the optical components of the focus camera assy Z X Y Camera weight = 3 lbs Array lens assy : 1 lb max Gravity in Z-dir Gravity in Y-dir GravityRotationArray lens #1CCD05UTS50CC Max. allowable flexure/hr From FEAMax. allowable flexure From FEA Max. shift Z-dir90° 0.1 arcsec =3.6 µm.78 µm 0.1 arcsec =1.2 µm.58 µm.05 arcsec. 15°/hr.005 arcsec.012 arcsec Y-dir90°1.2 µm.33 µm 15°/hr.008 arcsec.007 arcsec

HOWFS/ACam Flexure of the main optic mount struture Z Y X 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 *1 *2*3 *4 *5

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

HOWFS/ACam GravityRotationCO1Mirror #1Field stop Max. allowable flexure/hr From FEAMax. allowable flexure From FEA Max. allowable flexure From FEA Z-dir90° 0.1 arcsec =3.6 µm.17 µm 0.1 arcsec =39 µm.075 µm 0.1 arcsec=39 µm.18 µm 15°/hr.0012 arcsec arcsec.0001 arcsec Y-dir90°048 µm.08 µm 0.1 arcsec=39 µm 1 arcsec arcsec arcsec 15°/hr.0006 arcsec GravityRotation CCD05Array lens #1CO1Mirror #1Field stopTotal flexure From FEA Z-dir15°/hr 012 aarcsec.005 arcsec.0012 arcse arcsec arcsec arcsec Y-dir15°/hr 007 aarcsec.008 arcsec arcse arcsec arcsec 0164 arcsec Total flexure of Optic mount struture Total flexure of MPA-CC stage Total flexure of UTS50 stage Total flexure of ATS150 stage +++ (Z-dir).0184 arcsec (Y-dir).0164 arcsec.012 arcsec.05 arcsec ? ≤ 0.1 arcsec/hr

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

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

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

HOWFS/ACam Main dark cover design and installation Main dark cover with Captive hardware 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. Sliding posts

HOWFS/ACam Top view of the optical bench

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

DM 3368 X Y X Displacement at the center of DM3368 [mm] DM 3368 tilted thru gravity [arcsec] Gravity in X dirGravity in Y dirTilt in Y dir of gravity only 2.28 e e Block to represent the DM3368 assy for analysis (weight approx. 21 lbs) Flexure analysis