Status of the LARP Phase II Secondary Collimator Prototype
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Status of the LARPPhase II Secondary Collimator Prototype
14 October 2013LHC Collimation WG Meeting
Tom Markiewicz/SLAC
BNL - FNAL- LBNL - SLACUS LHC Accelerator Research Program
6 September 2013
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Collimator Assembled 13-Mar-11Mechanical & Resistance Tests Good
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. MarkiewiczSlide n° 2 / 20
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Collimator Assembled 18-Sept-13Mechanical & Resistance Tests Good
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• Continuous 15m copper tube wrapped on copper mandrel• Tube enters from far end of mandrel then begins spiral to provide
~1m free length that can twist to allow rotation• 25mm thick Glidcop “jaw” brazed to mandrel
• 20 “20mm wide facets” 25um flat are the collimating surfaces• Molybdenum shaft with 2mm “heat expansion gap” from mandrel
• Mandrel held at midpoint only by a brazed Glidcop “hub”
Jaw Designed to Minimize Thermal Distortion1 hour beam→12kW with 10 second transients x5→60kW
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. MarkiewiczSlide n° 4 / 20
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New Bearing Restraint
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz
“Naked” Hub Screwed to Axle Bearing on Hub Spacer Ring & Bearing in Housing
Bearing Restraint Ring, Bearing in Housing & Clip Oversize Outer Housing w/ Flats that prevent rotation in jaw supports
Slide n° 5 / 20
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New RF Bearing Assembly
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz
Ceramic bearing in race & the 2 rings that capture it
Assembled bearing package that will hold the RF Foil
Trapped bearing in ring that is fixed to the collimator jaw
Attaching outer ring to collimator Close-up of ridge where bearing rolls
Before outer ring screwed on
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Final RF Bearing Installed
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BeCu Foils, Rhodium plate “wipers”, Clamps to keep RF Bearing Package
from Dragging
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz
Foils, wipers & clamps Thermistor/Foil/Wiper Holder
Holder w/Wiper/Foil Attached
Beam-side View View Behind Foil w/ Clamp ATtached
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Welding Flanges Attached to Tank Cover and Baseplate
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Dry Fit Cover to Baseplate & test Rotation w/Foils Attached
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Resistivity Test: 1 mOhm/side
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Jaw Alignment & CMM
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Final Adjustment of Actuator & Drive Wheel (relative to Inner Limit Switch)
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz
Remember to play movie
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Leak Test Cooling Tubes (most recent)Pressure & Leak Rate
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz
Left Jaw (AC) Right Jaw (BD)
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Prep & “CuSil” the Cooling Tube to the Bellows Feedthrough
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz
BeforeSlide n° 15 / 20
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On 30 Sept Remove Return Spring to CuSil the Remaining Two Tubes
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz
Before After
Leak Check Tubes Again
Slide n° 16 / 20
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Install Tank Cover, Install Thermistor Feedthrough Flanges, Simulate Weld with Vise Grips and
Test Rotation Drive (1 OCT)
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Design, Fab, Install, Adjust & Test Flexure to Set Actuator Height
(can always be accessed through flange openings and adjusted if needed)
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Work List
After that, wind 2nd mandrel, then …………..Prep with strips & braze coils and inner hub/shafts to mandrels (2 of 2 done)Machine assembly round & concentric to axis at diameter to accept Glidcop jawsMachine & Cu plate Glidcop jawsPrep and braze jaws to mandrels (2nd done 8-Apr-13)
Machine facets, end features (2nd done 28-May-13)
Install RF bearing housingInstall shaft support bearings and rotation drivesTest prior to installation in vacuum systemPrep existing vacuum base plate to receive new collimatorsMount, align & testDecide details of how vacuum cover will be attached to vacuum base plate &
machine appropriatelyMate cover & baseplateTest rotation after welding, pre and post vacuumVacuum bakeoutTest after bakeoutShip
Begin 3-June-2-13
SLA
CS
LAC
?
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At SLAC• Clamp vacuum cover in place, attach foils & test rotate 1 facet• Weld cover, vacuum test all welds & CuSil joints• Final full facet test rotation in vacuum• Solder metric water fittings, pressure test then dry & leak test tubes again• Immobilize jaws & ship (in 2 weeks time?)At CERN• Decide whether to open vacuum seal or not• Off beam tests:
• Function, metrology, impedance, vacuum• Bakeout (???)
• SPS tests (???)• Hi Rad Mat Tests & Subsequent Analysis
Suggested Plan That Needs More Discussion
LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. MarkiewiczSlide n° 20 / 20