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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. 14 October 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 14 October 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 Close-up 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 Before LARP RC Status - T. Markiewicz

  16. On 30 Sept Remove Return Spring to CuSil the Remaining Two Tubes Before After Leak Check Tubes Again LARP RC Status - T. Markiewicz

  17. Install Tank Cover, Install Thermistor Feedthrough Flanges, Simulate Weld with Vise Grips and Test Rotation Drive (1 OCT) LARP RC Status - T. Markiewicz

  18. Design, Fab, Install, Adjust & Test Flexure to Set Actuator Height(can always be accessed through flange openings and adjusted if needed) LARP RC Status - T. Markiewicz

  19. 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

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

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