MERLIN BEAMLINE RIXS refocusing mirror system D. Yegian

4-0-3 RIXS KB mirror review210/16/2015 The MERLIN beamline 4-0-3

4-0-3 RIXS KB mirror review310/16/2015 The endstations area Mirrors to be reviewed

4-0-3 RIXS KB mirror review410/16/2015 The mirror system View from an outboard upstream position View from an inboard downstream position Beam

4-0-3 RIXS KB mirror review510/16/2015 The mirrors on the mounting plate M323 Silicon Flat (Ellipse) Spec , Dwg. 26F168 Vertical deflection 6 degree M322 Silicon Spherical (R=38.1M) Spec , Dwg. 26F239 Horizontal deflection 6 degree Beam

4-0-3 RIXS KB mirror review610/16/2015 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 review710/16/2015 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 review810/16/2015 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”

4-0-3 RIXS KB mirror review910/16/2015 Vacuum vessel ports Bender Downstream diagnostic Roll Mechanism Upstream diagnostic Diagnostic port Future diagnostic Access Ports

4-0-3 RIXS KB mirror review1010/16/2015 Phosphor coated surfaces mask Downstream Bender clamp Upstream Bender clamp Variable width vertical aperture

4-0-3 RIXS KB mirror review1110/16/2015 M322: description and specifications Table II: alignment and stability requirement for M322 alignment Mechanical stepstability X 100  m (1mm) N/A 10  m Y 100  m (1mm) N/A 10  m Z 100  m (1mm) N/A 10  m XX 1mradN/A0.1mrad YY  rad (100  rad)5  rad2.4  rad ZZ 100  rad (1mrad) N/A 11  rad Ref: RIXS_refocus_ doc in eRoom

4-0-3 RIXS KB mirror review1210/16/2015 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

4-0-3 RIXS KB mirror review1310/16/2015 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. alignment Mechanical stepstability X 100  m N/A 10  m Y 100  m (500  m) N/A 3.3  m Z 5  m (50  m) N/A 0.25  m XX 5  rad (20  rad) N/A 0.13  rad YY 25  rad (200  rad) N/A 10  rad ZZ 1mradN/A0.1mrad Note: 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 Spring S Spring Bender Beam 10:1 lever

Glue Block Details Mask captures mirror “Washer” bars to minimize torsion upon tightening Hysol NA 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 NA. Max downstream is 15 MPa, max upstream is 10 MPa.

4-0-3 RIXS KB mirror review1910/16/2015 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 review2010/16/2015 M323 Parameter Table MirrorLeaf springVertical spring MaterialSilicon17-4 PH (up/down)17-4 PH Thickness[mm] / Free length[mm] Width[mm]~26.0 (varies)25 Couple / Force[N-m] / N3.66/ / 30.6 N Translation / step size10,000:1+/-.5mm / 1 um Bender Beam Aluminum / 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