Status of the LARP Phase II Secondary Collimator Prototype

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


• 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


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


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


BeCu Foils, Rhodium plate “wipers”, Clamps to keep RF Bearing Package

from Dragging


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


Dry Fit Cover to Baseplate & test Rotation w/Foils Attached


Resistivity Test: 1 mOhm/side


Jaw Alignment & CMM


Final Adjustment of Actuator & Drive Wheel (relative to Inner Limit Switch)


Remember to play movie

Slide n° 13 / 18

Leak Test Cooling Tubes (most recent)Pressure & Leak Rate


Left Jaw (AC) Right Jaw (BD)

Slide n° 14 / 18

Prep & “CuSil” the Cooling Tube to the Bellows Feedthrough


Need Today to Remove Spring to CuSil the Remaining Two Tubes


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

?


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


Status of the LARP Phase II Secondary Collimator Prototype

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