BNL - FNAL- LBNL - SLAC Status of the LARP Phase II Secondary - - PowerPoint PPT Presentation

Status of the LARP Phase II Secondary Collimator Prototype

14 October 2013 LHC Collimation WG Meeting Tom Markiewicz/SLAC

BNL - FNAL- LBNL - SLAC US LHC Accelerator Research Program

6 September 2013

Collimator Assembled 13-Mar-11 Mechanical & Resistance Tests Good

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 2 / 20

Collimator Assembled 18-Sept-13 Mechanical & Resistance Tests Good

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 3 / 20

• 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 Distortion

1 hour beam→12kW with 10 second transients x5→60kW

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 4 / 20

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

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

Slide n° 6 / 20

Final RF Bearing Installed

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 7 / 20

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

Slide n° 8 / 20

Welding Flanges Attached to Tank Cover and Baseplate

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 9 / 20

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

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 10 / 20

Resistivity Test: 1 mOhm/side

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 11 / 20

Jaw Alignment & CMM

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 12 / 20

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

Slide n° 13 / 20

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)

Slide n° 14 / 20

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

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz

Before

Slide n° 15 / 20

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

Install Tank Cover, Install Thermistor Feedthrough Flanges, Simulate Weld with Vise Grips and Test Rotation Drive (1 OCT)

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 17 / 20

Design, Fab, Install, Adjust & Test Flexure to Set Actuator Height

(can always be accessed through flange openings and adjusted if needed)

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 18 / 20

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?

LHC Collimation WG Mtg - 14 Oct 2013 LARP RC Status - T. Markiewicz Slide n° 19 / 20

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. Markiewicz Slide n° 20 / 20