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Status of the LARP Phase II Secondary Collimator Prototype

US LHC Accelerator Research Program. BNL - FNAL- LBNL - SLAC. Status of the LARP Phase II Secondary Collimator Prototype. 30 September 2013 LHC Collimation WG Meeting Tom Markiewicz/SLAC. 6 September 2013. Collimator Assembled 13-Mar-11 Mechanical & Resistance Tests Good.

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Status of the LARP Phase II Secondary Collimator Prototype

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  1. US LHC Accelerator Research Program BNL - FNAL- LBNL - SLAC Status of the LARPPhase II Secondary Collimator Prototype 30 September 2013 LHC Collimation WG Meeting Tom Markiewicz/SLAC 6 September 2013

  2. Collimator Assembled 13-Mar-11Mechanical & Resistance Tests Good LARP RC Status - T. Markiewicz

  3. Collimator Assembled 18-Sept-13Mechanical & Resistance Tests Good LARP RC Status - T. Markiewicz

  4. Jaw Designed to Minimize Thermal Distortion1 hour beam→12kW with 10 second transients x5→60kW • 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” LARP RC Status - T. Markiewicz

  5. New Bearing Restraint “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 LARP RC Status - T. Markiewicz

  6. 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 LARP RC Status - T. Markiewicz

  7. Final RF Bearing Installed LARP RC Status - T. Markiewicz

  8. BeCu Foils, Rhodium plate “wipers”, Clamps to keep RF Bearing Package from Dragging Holder w/Wiper/Foil Attached Foils, wipers & clamps Thermistor/Foil/Wiper Holder Beam-side View View Behind Foil w/ Clamp ATtached LARP RC Status - T. Markiewicz

  9. Welding Flanges Attached to Tank Cover and Baseplate LARP RC Status - T. Markiewicz

  10. Dry Fit Cover to Baseplate & test Rotation w/Foils Attached LARP RC Status - T. Markiewicz

  11. Resistivity Test: 1 mOhm/side LARP RC Status - T. Markiewicz

  12. Jaw Alignment & CMM LARP RC Status - T. Markiewicz

  13. Final Adjustment of Actuator & Drive Wheel (relative to Inner Limit Switch) Remember to play movie LARP RC Status - T. Markiewicz

  14. Leak Test Cooling Tubes (most recent)Pressure & Leak Rate Left Jaw (AC) Right Jaw (BD) LARP RC Status - T. Markiewicz

  15. Prep & “CuSil” the Cooling Tube to the Bellows Feedthrough LARP RC Status - T. Markiewicz

  16. Need Today to Remove Spring to CuSil the Remaining Two Tubes LARP RC Status - T. Markiewicz

  17. 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 jaws • Machine & Cu plate Glidcop jaws • Prep and braze jaws to mandrels (2nd done 8-Apr-13) • Machine facets, end features (2nd done 28-May-13) • Install RF bearing housing • Install shaft support bearings and rotation drives • Test prior to installation in vacuum system • Prep existing vacuum base plate to receive new collimators • Mount, align & test • Decide details of how vacuum cover will be attached to vacuum base plate & machine appropriately • Mate cover & baseplate • Test rotation after welding, pre and post vacuum • Vacuum bakeout • Test after bakeout • Ship Begin 3-June-2-13 SLAC SLAC? LARP RC Status - T. Markiewicz

  18. Suggested Plan That Needs More Discussion • 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 LARP RC Status - T. Markiewicz

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