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Mechanical Engineering Design Review

Mechanical Engineering Design Review. BL 4.0.3 ARPES Endstation. Derek Yegian, Jonathan Denlinger, Keith Franck 4/18/2008. Beamline 3D Layout. Monochromator. M322. M323. M302. M303. G301. G302. G302 (temp). RIXS. M321/M331. Entrance slit. Gas Cell. Exit slit. M332. M333. ARPES.

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Mechanical Engineering Design Review

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  1. Mechanical Engineering Design Review BL 4.0.3 ARPES Endstation Derek Yegian, Jonathan Denlinger, Keith Franck 4/18/2008

  2. Beamline 3D Layout Monochromator M322 M323 M302 M303 G301 G302 G302 (temp) RIXS M321/M331 Entrance slit Gas Cell Exit slit M332 M333 ARPES TOF

  3. Endstation Layout M322 M323 RIXS M332 M333 ARPES 44” TOF (2-bunch only)

  4. ARPES – Phase 1 (Sept. Installation) Beam Fixed Spool Sample rotation 2-part rotary Analyzer Fixed, horizontal Turntable Locked in place

  5. Support Structures (a) • Two independent supports • A) Vertical load (~2000 lbs) of chamber/analyzer carried through SKF spherical plain bearing on base plate

  6. Support Structures (b) • Two independent supports • B) Horizontal load and moments carried through six-strut assembly • Minor vertical load of tabletop and ancillary structure

  7. Chamber Assembly (a) Vertical rotation Alignment • Goal: Top chamber flange to rotate with 20 micron sphere of confusion (1) Turntable on top plate -- turntable rests on angled surface of cam bearings (2) Align bottom bushing to turntable rotation axis using dial indicator

  8. Align this flange to rotation axis Lateral pusher screw Access hole for vertical pusher screw Chamber Assembly (b) Vertical rotation Alignment (3) Install pumping base and top chamber through the turntable (4) Align top flange of chamber to rotation axis for position and perpendicularity - use dial indicator - adjustment screws for tilt, radial

  9. Chamber Assembly (c) Vertical rotation Alignment (5) Tighten bolts on bottom alignment plate (6) Raise lower support bearing (still allows chamber rotation) -- swivel self-aligning bearing; 30,000 lb. capacity -- leveling pad vertical adjustment -- plan for 1 mm vertical rise (chamber fiducialization) -- takes weight off cam bearings / six strut support assembly (7) Phase I: Clamp chamber to base plate (no rotation) -- keep lifted off cam bearings Tighten bolts Raise feet by 1mm

  10. Chamber Port Accuracy CMM report • Goal: Top chamber flange to rotate with <10 micron axis of confusion (1) Top port alignment to bottom flange -- center offset: dx=0.0067” dy=0.0142” , dr=0.0157” -- parallelism: dz = 24.375” dA = 0.6 millirad (2) Intersection of analyzer flange to vertical axis: dz = -0.0185” (from design value of 9.0” below top flange) -- not crucial: align beam to analyzer + sample to beam dy = -0.0076” (crucial for polar rotation) analyzer analyzer

  11. 48” 52” Seismic Parameters • Center of gravity • Base Floor Bolting Pattern • Floor survey • 3 existing 1/2” HILTI (type HDI) shells do not affect new anchor locations • No grade beam conflicts • Add four new 1/2” HILTI (type HDI) expansion anchors on 48”x44”. • Factor of safety • ~1.4 (w/o vacuum load) • ~1.3 (vacuum load) Manipulator/Centiax 75 lbs @ 83.8” 47” Rotary Seal 40 lbs @ 71.9” Analyzer 325 lbs @ 58” Off-axis 32” est. Chamber: 400 lbs @ 51.3” 60” 450 lbs @ 36.5” X Struts: 150 lbs @ 26” Pumping Tree: 450 lbs @ 27” Wgt = 3350 lbs. Height = 25.5” IP: 250 lbs @ 17.1” Off-axis 20” Weldment: 1350 lbs @ 6.35”

  12. Seismic Safety (Following Engineering note AL0015) • Center of Gravity 3700 lbs at 28.6” from floor (2.38” towards analyzer) • Floor Anchoring —use new ½” HILTI HDI on 48” x 44” Allowable loads: Tension: 2,374 lbs. / Shear: 1,798 lbs. — min. lever distance from bolt to edge = 46” • Horizontal inertial load in earthquake as high as 0.7 g acceleration x 3700 lbs. = 2580 lbs. • Tension load due to overturning: worst case leverage ratio = 25” / 21.8” = .62 pull-out load on two anchors = 2580x.62 = 1600 lbs. pull-out load (tension) per anchor = 1600 / 2 = 800 lbs. • Shear load due to sliding: shear load per anchor = 2580 / 4 = 640 lbs. • Safety Factor = 1/( (800/2374) + (640/1798) ) = 1.4 If 500 lbs of vacuum load added (equiv. 450 lbs towards analyzer, 210 lbs perp. analyzer) Safety Factor = 1 / ( (3030*.57/2/2374) + (3030/4/1798)) = 1.3

  13. Top Rotary Seal Phase I vs Phase II (Phase I) Standard 2-part face seal (have in hand) -- APX design --> LBNL --> DV Manufacturing (fab) H=1.81” -- double-sided flange on bottom for clearance of top ports standard: H=0.87” -- double-sided flange on top to match Phase II height custom: H=1.8535” (or 2 x 0.87” = 1.74”?) Sum = 4.53” (Phase II) -- Custom 3-part radial seal: H = 4.53375” -- bottom connects to rotatable chamber (analyzer polar angle) -- middle connects to fixed stand -- top connects to rotatable manipulator (sample polar angle)

  14. Analyzer Rotation Phase I vs Phase II (Phase I) -- rigid nipple -- analyzer in horizontal geometry (vertical slit) -- support bracket off of base plate -- increase rigidity to stand (Phase II) -- Custom high load 2-part radial seal -- Rotation for selection two orientations (not scanning) -- Slow rotation speed (factor for safety) -- Sliding contact of analyzer lens mu-metal with chamber mu-metal (?)

  15. Summary Phase 1 (Sept. install): Fixed chamber and analyzer Turntable installed but locked down Assembly will require extensive alignment Vertical load taken by spherical bearing Phase 2 Need robotics safety review/plan for motions Vacuum load preloads cam bearings Seismic loading has a factor of safety of 1.27 min. Redesign of analyzer mu-metal liner may be needed

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