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MERLIN BEAMLINE RIXS refocusing mirror system

MERLIN BEAMLINE RIXS refocusing mirror system. D. Yegian 12-19-08. The MERLIN beamline 4-0-3. The endstations area. Mirrors to be reviewed. The mirror system. Beam. Beam. View from an inboard downstream position. View from an outboard upstream position.

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MERLIN BEAMLINE RIXS refocusing mirror system

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  1. MERLIN BEAMLINERIXS refocusing mirror system D. Yegian 12-19-08

  2. The MERLIN beamline 4-0-3 4-0-3 RIXS KB mirror review

  3. The endstations area Mirrors to be reviewed 4-0-3 RIXS KB mirror review

  4. The mirror system Beam Beam View from an inboard downstream position View from an outboard upstream position 4-0-3 RIXS KB mirror review

  5. 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

  6. 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” 4-0-3 RIXS KB mirror review

  7. 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. 4-0-3 RIXS KB mirror review

  8. 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 32.5” 31.5” 4-0-3 RIXS KB mirror review

  9. Vacuum vessel ports Downstream diagnostic Roll Mechanism Upstream diagnostic Future diagnostic Diagnostic port Bender Access Ports 4-0-3 RIXS KB mirror review

  10. Phosphor coated surfaces Downstream Bender clamp mask Upstream Bender clamp Variable width vertical aperture 4-0-3 RIXS KB mirror review

  11. M322: description and specifications Table II: alignment and stability requirement for M322 Ref: RIXS_refocus_101607.doc in eRoom 4-0-3 RIXS KB mirror review

  12. 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 review

  13. 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 ) 4-0-3 RIXS KB mirror review

  14. M323 Elliptical Bender Mechanism Table III: alignment and stability requirement for M323. Note: Can roll M322 if Y or Z offset too large.

  15. M323 Elliptical Bender Mechanism Optic S Spring Leaf Spring Bender Beam 10:1 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

  16. 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

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

  18. 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.

  19. 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) 9/19/2014 4-0-3 RIXS KB mirror review 19

  20. M323 Parameter Table Rotary motion of screw Linear motion of screw 4-0-3 RIXS KB mirror review

  21. 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

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