MERLIN BEAMLINE RIXS refocusing mirror system
description
Transcript of MERLIN BEAMLINE RIXS refocusing mirror system
MERLIN BEAMLINE
RIXS refocusing mirror system
D. Yegian
12-19-08
4-0-3 RIXS KB mirror review 204/21/23
The MERLIN beamline 4-0-3
4-0-3 RIXS KB mirror review 304/21/23
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
4-0-3 RIXS KB mirror review 604/21/23
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”
4-0-3 RIXS KB mirror review 704/21/23
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
4-0-3 RIXS KB mirror review 804/21/23
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)
4-0-3 RIXS KB mirror review 2004/21/23
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