mechanical engineering design review
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Mechanical Engineering Design Review
BL 4.0.3 ARPES Endstation
Derek Yegian, Jonathan Denlinger, Keith Franck4/18/2008
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Beamline 3D Layout
M302
Entrance slit
Monochromator
M303 G301 G302
G302 (temp)
Exit slit
M321/M331
M332 M333
M322 M323
RIXS
ARPESTOF
Gas Cell
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Endstation Layout
M332 M333
M322 M323
RIXS
ARPES
TOF (2-bunch only)
44”
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ARPES – Phase 1 (Sept. Installation)
Fixed Spool
Sample rotation2-part rotary
AnalyzerFixed, horizontal
TurntableLocked in place
Beam
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Support Structures (a)
• Two independent supports– A) Vertical load (~2000 lbs) of chamber/analyzer carried through SKF
spherical plain bearing on base plate
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Support Structures (b)
• Two independent supports– B) Horizontal load and moments carried through six-strut assembly
» Minor vertical load of tabletop and ancillary structure
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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
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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
Access hole for vertical pusher screw
Lateral pusher screw
Align this flange to rotation axis
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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
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Chamber Port AccuracyCMM 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 beamdy = -0.0076” (crucial for polar rotation)
analyzer
analyzer
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Seismic Parameters
• Center of gravity
Wgt = 3350 lbs. Height = 25.5”
• Base Floor Bolting Pattern
60”
(1) Floor survey3 existing 1/2” HILTI (type HDI) shells do
not affect new anchor locationsNo grade beam conflicts
(2) Add four new 1/2” HILTI (type HDI) expansion anchors on 48”x44”.
(3) Factor of safety~1.4 (w/o vacuum load)
~1.3 (vacuum load)
Weldment: 1350 lbs @ 6.35”
Analyzer325 lbs @ 58”Off-axis 32” est.
IP: 250 lbs @ 17.1”Off-axis 20”
Manipulator/Centiax75 lbs @ 83.8”
Rotary Seal40 lbs @ 71.9”
47”
450 lbs @ 36.5”
Struts: 150 lbs @ 26”Pumping Tree: 450 lbs @ 27”
Chamber: 400 lbs @ 51.3”
48”
52”X
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Seismic Safety
• 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
(Following Engineering note AL0015)
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Top Rotary Seal
(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)
Phase I vs Phase II
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Analyzer Rotation
(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 (?)
Phase I vs Phase II
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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 2Need 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