Status of the LARPPhase II Secondary Collimator Prototype
30 September 2013LHC Collimation WG Meeting
Tom Markiewicz/SLAC
BNL - FNAL- LBNL - SLACUS LHC Accelerator Research Program
6 September 2013
Collimator Assembled 13-Mar-11Mechanical & Resistance Tests Good
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 2 / 18
Collimator Assembled 18-Sept-13Mechanical & Resistance Tests Good
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 3 / 18
• 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 - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 4 / 18
New Bearing Restraint
LHC Collimation WG Mtg - 30 Sept 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 / 18
New RF Bearing Assembly
LHC Collimation WG Mtg - 30 Sept 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 Closeup of ridge where bearing rolls
Before outer ring screwed on
Slide n° 6 / 18
Final RF Bearing Installed
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 7 / 18
BeCu Foils, Rhodium plate “wipers”, Clamps to keep RF Bearing Package
from Dragging
LHC Collimation WG Mtg - 30 Sept 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
Slide n° 8 / 18
Welding Flanges Attached to Tank Cover and Baseplate
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 9 / 18
Dry Fit Cover to Baseplate & test Rotation w/Foils Attached
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Resistivity Test: 1 mOhm/side
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 11 / 18
Jaw Alignment & CMM
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 12 / 18
Final Adjustment of Actuator & Drive Wheel (relative to Inner Limit Switch)
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. Markiewicz
Remember to play movie
Slide n° 13 / 18
Leak Test Cooling Tubes (most recent)Pressure & Leak Rate
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. Markiewicz
Left Jaw (AC) Right Jaw (BD)
Slide n° 14 / 18
Prep & “CuSil” the Cooling Tube to the Bellows Feedthrough
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Need Today to Remove Spring to CuSil the Remaining Two Tubes
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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
?
LHC Collimation WG Mtg - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 17 / 18
At SLAC• After CuSil test for tube integrity• 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 - 30 Sept 2013 LARP RC Status - T. MarkiewiczSlide n° 18 / 18