MERLIN%20BEAMLINE%20RIXS%20refocusing%20mirror%20system

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MERLIN BEAMLINERIXS 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
Beam
Beam
View from an inboard downstream position
View from an outboard upstream position
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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 (R38.1M) 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
51.5
33.5
36.25
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Stability of the stand
Shear plates, no Zanite First mode at 77Hz
Zanite, no shear plates First mode at 82Hz
Without Shear Plates or Zanite - first mode at
61Hz
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.
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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
• F1435.7/4251 lbs
• gt Safety factor from seismic calculations is 2.8
  or greater

32.5
31.5
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Vacuum vessel ports
Downstream diagnostic
Roll Mechanism
Upstream diagnostic
Future diagnostic
Diagnostic port
Bender
Access Ports
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Phosphor coated surfaces
Downstream Bender clamp
mask
Upstream Bender clamp
Variable width vertical aperture
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M322 description and specifications
Table II alignment and stability requirement for
M322
alignment Mechanical step stability
X 100mm (1mm) N/A 10mm
Y 100mm (1mm) N/A 10mm
Z 100mm (1mm) N/A 10mm
QX 1mrad N/A 0.1mrad
QY gt60mrad (100mrad) 5mrad 2.4mrad
QZ 100mrad (1mrad) N/A 11mrad
Ref 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 (doesnt 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 )
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M323 Elliptical Bender Mechanism
Table III alignment and stability requirement
for M323.
alignment Mechanical step stability
X 100mm N/A 10mm
Y 100mm (500mm) N/A 3.3mm
Z 5mm (50mm) N/A 0.25mm
QX 5mrad (20mrad) N/A 0.13mrad
QY 25mrad (200mrad) N/A 10mrad
QZ 1mrad N/A 0.1mrad
Note Can roll M322 if Y or Z offset too large.
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M323 Elliptical Bender Mechanism
Optic
S Spring
Leaf Spring
Bender Beam 101 lever
Hard stops
LVDT
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
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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
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FEA of bending mechanism

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

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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)
Hard stop to limit leaf spring (set .5mm above
10mm nominal bend)
Washer (2x)
Precision ball (2x)
Threaded rod
LVDT 050- HR Resolution .05 um (20x min. step
size)
4-0-3 RIXS KB mirror review
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5/27/2019
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M323 Parameter Table
Rotary motion of screw Linear motion of screw
Mirror Leaf spring Vertical spring
Material Silicon 17-4 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 10,0001 /- .5mm / 1 um

Bender Beam
Aluminum
6.35
190
.25

2.2 / 3.6 (at spring)
/- 5mm
(10 um 14.4 )
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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