Status of the LARPPhase 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-11Mechanical & Resistance Tests Good

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

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

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• 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 - 14 Oct 2013 LARP RC Status - T. MarkiewiczSlide 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. MarkiewiczSlide 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

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

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Resistivity Test: 1 mOhm/side

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

Jaw Alignment & CMM

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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

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Install Tank Cover, Install Thermistor Feedthrough Flanges, Simulate Weld with Vise Grips and

Test Rotation Drive (1 OCT)

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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. MarkiewiczSlide 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

SLA

CS

LAC

?

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