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.

Aug 16-2009KHANH

Newport mirror mounts with 6” mirror

)versized base plate for ease of clampOn the bench

FM1

FM2

FM1 & FM2 Mount structure design

Displacement analysis

The displacement of the structure is greatest when it is inhorizontal position as shown. The flexure analysis is onlyfocus 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 relativeto the fixed base : .009 mm (linear) 0.0015 (rotation) = 5.4arc secWith 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 compressionSpring 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 tip1.5 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 mountPhotosigma #112-4460

Because of space constrain.someConditions 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

19.5

11.1

flexure in Y-dir

4.7 9.1

Flexure in X-dir

Flexure in Z-dir

Gravity in X-dir Gravity 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 stagewithout disturbing an optical alignment.

HOWFS/ACam

Main dark cover

Snap-in rubber profilefor light seal

Dark cover structure

HOWFS/ACam

Lens out of beam configuration

Baffle(part of dark cover)

HOWFS/ACam

Dark cover

Camera assyPins installed to ensure the repeatabilityof the camera assy

Focus camera assy lay-out

Array lens #1

CCD50

Adjustment knobs will be replacedWith low profile hardware

HOWFS/ACam

Flexure of the optical components of the focus camera assy

Z

X

Y

Camera weight = 3 lbsArray lens assy : 1 lb max

Gravity in Z-dirGravity in Y-dir

Gravity Rotation Array lens #1 CCD05 UTS50CC

Max. allowable flexure/hr

From FEA Max. allowable flexure

From FEA Max. shift

Z-dir 90°0.1 arcsec=3.6 µm

0.1 arcsec=3.6 µm

.78 µm

0.1 arcsec=1.2 µm

0.1 arcsec=1.2 µm

.58 µm

.05 arcsec. 15°/hr .005 arcsec .012 arcsec

Y-dir 90° 1.2 µm .33 µm

15°/hr .008 arcsec .007 arcsec

HOWFS/ACam

Flexure of the main optic mount struture

ZY

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/hrFrom FEA : 0.27 µm = .022 arcsec /hr

HOWFS/ACam

Gravity Rotation CO1 Mirror #1 Field stop

Max. allowable flexure/hr

From FEA Max. allowable flexure

From FEA Max. allowable flexure

From FEA

Z-dir 90°0.1 arcsec=3.6 µm

0.1 arcsec=3.6 µm

.17 µm

0.1 arcsec=39 µm

0.1 arcsec=39 µm

.075 µm

0.1 arcsec=39 µm

.18 µm

15°/hr .0012 arcsec .00005 arcsec .0001arcsec

Y-dir 90° 048 µm .08 µm

0.1 arcsec=39 µm

1 arcsec

.00034 arcsec .00005 arcsec15°/hr .0006arcsec

Gravity Rotation

CCD05 Array lens #1 CO1 Mirror #1 Field stop Total flexure

From FEA

Z-dir 15°/hr012 aarcsec

.005 arcsec .0012 arcse .00005 arcsec .0001 arcsec

..0184arcsec

Y-dir 15°/hr007 aarcsec

.008 arcsec

.00034 arcse .00005 arcsec

.

0006arcsec 0164arcsec

Total flexure of Optic mount struture

Total flexure ofMPA-CC stage

Total flexure ofUTS50 stage

Total flexure ofATS150 stage + + +

(Z-dir) .0184 arcsec

(Y-dir) .0164 arcsec

.012 arcsec .05 arcsec ? ≤ 0.1 arcsec/hr

HOWFS/ACamField stop assy using existing components

Cut for clearance

Adjustment direction

Adjustment direction

HOWFS/ACamField stop assy usung XYZ stage

Direction of adjustment of mirror

Dire

ctio

n of

adj

ustm

ent o

f mirr

or

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 #AJS100-0.5 ARE ON ORDER

HOWFS/ACamField stop assy usung XYZ stage

Field stop assy

HOWFS/ACamMain dark cover design and installation

Main dark cover withCaptive hardware

Baffle tube(part of the dark cover)

To prevent the dark cover from strikingthe fold mirror assy during an installationof the cover,two long posts are mounted in place as shown for the cover to slide Down. The dark cover will be engaged withthe posts first before sliding past the foldmirror assy .

Sliding posts

HOWFS/ACam

Top view of the optical bench

DM 3368Design concept

DM holding frame assyWeight :8.6 lbs

Frame shown with DM assy in place

-Completed all detail drawings,but not yet to release for fabrication

DM 3368

X

Displacement at the center of DM3368

[mm]

DM 3368 tilted thru gravity

[arcsec]

Gravity in X dir Gravity in Y dir Tilt in Y dir of gravity only

3.4 e-03 1.4e-03 2.2

Block to represent the DM3368 assy for analysis(weight approx. 57 lbs)

Flexure analysis

X

Y

Y

X