MERLIN BEAMLINE

RIXS refocusing mirror system

D. Yegian

12-19-08

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The MERLIN beamline 4-0-3

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The endstations area

Mirrors to be reviewed

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The mirror system

View from an outboard upstream position

View from an inboard downstream position

Beam

Beam

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The mirrors on the mounting plate

M323 Silicon Flat (Ellipse) Spec. 10272, Dwg. 26F168 Vertical deflection 6 degree

M322 Silicon Spherical (R=38.1M) Spec. 10273, Dwg. 26F239

Horizontal deflection 6 degree

Beam

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The stand

The 4 posts are ASTM A500B rectangular tubing 6” x 8” x .25”

Cross members are 2” x 6” x .25”

Floor plate 1” thick

Hole in the center is for grouting with Chockfast Red

Not Zanite-filled

33.5”36.25”

51.5”

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Stability of the stand

Without Shear Plates or Zanite - first mode at 61Hz

Shear plates, no Zanite First mode at 77Hz

Engineering note number M7629 written by Will Thur recommends to have the first mode above 20Hz. As there is a cryocompressor nearby and the ARPES stand was designed to be above 60Hz, this stand meets the same goal without zanite or shear plates.

Zanite, no shear plates First mode at 82Hz

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Earthquake safety

• Total mass: 1435lb

• Pull out load per anchor :F=(1435*.7*(32.5/31.5))/2 =518 lbs

• Shear load :F=1435*.7/4=251 lbs

=> Safety factor from seismic calculations is 2.8 or greater

31.5”

32.5”

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Vacuum vessel ports

Bender

Downstream diagnostic

Roll Mechanism

Upstream diagnostic

Diagnostic port

Future diagnostic

Access Ports

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Phosphor coated surfaces

mask

Downstream Bender clamp

Upstream Bender clamp Variable width

vertical aperture

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M322: description and specifications

Table II: alignment and stability requirement for M322

alignmentMechanical step stability

X 100m (1mm) N/A 10m

Y 100m (1mm) N/A 10m

Z 100m (1mm) N/A 10m

X 1mrad N/A 0.1mrad

Y rad (100rad) 5rad 2.4rad

Z 100rad (1mrad) N/A 11radRef: RIXS_refocus_101607.doc in eRoom

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Flexure Design / Stress

Flexure: 6061-T6 Aluminum

Moment on flexure face of 1375 N-mm (12.2 in-lb) will bottom out flexure on integral hardstop

If bottomed out: 106 MPa

Max Stress allowed: 276 MPa

Safety factor: 2.6 for yielding

Will place shim in .012” (.3 mm) in gap to reduce handling issues

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Leaf Spring Mechanism

Leaf Spring: 17-4 PH, .031 thick, 6” long

Travel: 25mm max (doesn’t bottom out)

Deformation in vertical: ~1.8mm at max

Nominal location: 12.5mm, set optic parallel to gravity at this position

Step size: 25 um (.001”) give 4.6 urad (goal) (if greater resolution desired, use .020” for the leaf spring which will give ~4x the resolution), use tilt sensor for “home” position

Stress levels: ~500 MPa, (1000 MPa yield for 17-4 PH H900 )

M323 Elliptical Bender Mechanism

Table III: alignment and stability requirement for M323.

alignmentMechanical step stability

X 100m N/A 10m

Y 100m (500m) N/A 3.3m

Z 5m (50m) N/A 0.25m

X 5rad (20rad) N/A 0.13rad

Y 25rad (200rad) N/A 10rad

Z 1mrad N/A 0.1mradNote: Can roll M322 if Y or Z offset too large.

M323 Elliptical Bender Mechanism

Silicon flat, 8mm thick, side shaping to achieve ellipse when bent

Upstream couple: 3.66 N-m (2.7 ft-lb), Downstream couple: 6.11 N-m (4.5 ft-lb)

Leaf spring thickness (up: 2.0mm, down: 2.5mm) set for 10mm displacement

Leaf spring material: 17-4 PH H900

LVDT to correlate (absolute) with bend set on LTP: resolution .05um for 1.0 mm travel

Optic

Hard stops

LVDT

Leaf SpringS Spring

Bender Beam 10:1 lever

Glue Block Details

Mask captures mirror

“Washer” bars to minimize torsion upon tightening

Hysol 9309.3NA

Chamfers at top and end of shelf to allow for epoxy fillet and to reduce stress at edges

Tapered shelf to reduce stress

FEA of bending mechanism

• Stresses in bending mechanism parts are well below yield strength for Stainless 17-4 PH. Max stress 25 MPa.

FEA of glue block

Bond shear stresses are below shear strength of epoxy: 32 MPa for Hysol 9309.3 NA. Max downstream is 15 MPa, max upstream is 10 MPa.

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Linkage

Clamp nut (2x)

Precision ball (2x)

Threaded rod

Washer (2x)

LVDT: 050- HR

Resolution: .05 um (20x min. step size)

Hard stop to limit leaf spring (set .5mm above 10mm nominal bend)

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M323 Parameter Table

Mirror Leaf spring Vertical spring

Material Silicon17-4 PH

(up/down) 17-4 PH

Thickness [mm] 8.0 2.03 / 2.53 0.76

Free length [mm] 450 180 58.4

Width [mm] ~26.0 (varies) 25 25

Couple / Force [N-m] / N 3.66/6.11 18.3 / 30.6 N

Translation / step size 10,000:1 +/- .5mm / 1 um

Bender Beam

Aluminum

6.35

190

.25

2.2 / 3.6 (at spring)

+/- 5mm

(10 um = 14.4 °)

Rotary motion of screw

Linear motion of screw

Additional Components

Upstream assembly has pumping for vessel, diagnostic paddle (wire, mesh, photodiode), and shutter

Within vessel, variable vertical defining aperture for selecting illumination location on optic