LARP Rotatable Collimators 19 June 2006 ILC R&D Status Meeting Tom Markiewicz/SLAC BNL - FNAL- LBNL - SLAC US LHC Accelerator Research Program

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 2 / 14 Advances since RC1 Baseline

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 3 / 14 New Idea to Eliminate Central Stop 1.Hub located, in Z, near peak temperature location, which lowers peak temperature, reducing gradient and bending. 2.Both ends of jaw deflect away from beam. 3.Total deflection reduced if the shaft deflection can be minimized 4.Cooling coils embedded in I.D. of outer cylinder.

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 4 / 14 Evolution of jaw-hub-shaft 25mm deep cooling tubes SS 1hr beam Transient beam RC1 – not a practical support scheme More realistic Note reduced shaft end deflection – a positive result if stop is used Next for jaw-hub-shaft: Alternative materials to reduce shaft deflection

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 5 / 14 Current Experimental Activities Consistent with Review Committee Dictum to Delay Construction Until Mechanical Design Complete Braze tests of cooling coils in progress: procedures defined Prep for full cooling & deformation tests: parts & lab defined Acquisition of Phase I support & mover assemblies: quote “in the mail” Remodeling of CERN parts for interface to US parts: designer Note faceted face: Vertical Alignment & “Drip Edge”

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 6 / 14 Single Jaw Thermal Test Hardware Ready to buy the following from National Instruments: 1 each SCXI-1600 USB Data Acquisition and Control Module 1 each SCXI Slot Chassis U.S. 120 VAC 1 each SCXI Channel Isothermal Terminal Block 1 each SCXI-1102B 32-Channel Amplifier, 200 Hz Bandwidth 12 each SCXI-1361 Rear Filler Panel 8 each SCXI-1360 Front Filler Panel Cover 1 each Shielded Cable for interconnect Cost is about $5300 –Project now has PC with Labview software installed

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 7 / 14 Brazing Tests Cooling Tube Jaw Center Mandrel ~100 mm ~70 mm dia ~100 mm dia

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 8 / 14 Concept to Eliminate 4-Loop Coils at Ends Restrain each tube on centerline of bearing 200mm 136mm dia

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 9 / 14 Phase II Task Summary Project has slipped 6 months in 6 months due to –Reality of hard deliverables as opposed to softer “design” milestones –Staffing delays: failed job offers, safety mandates, personal issues … –Understandable design requests by review committee Nothing we didn’t know about Budget “slipped” 6 months or $430k as well After taking this hit we believe we are on-track to deliver on new schedule –Nervous now about accident condition: begin to discuss beam tests –Believe various steady state requirements are attack-able on an “as good as can be engineered” basis –Excellent recent ideas simplify design and increase performance x5 Expect thermal tests and completely tested RC1 device by end of FY06 and mid-FY07, respectively Need to get full Phase I mechanism from CERN vendor if we are to make RC2 deliver schedule. If SLAC can concentrate on jaws and have rest of infrastructure provided RC2 can meet LHC schedule. –Slippage hopefully consistent with CERN’s newest schedule

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 10 / 14 Materials for May 2006 BLIP Run are Ready Primary Phase II Materials: Annealed Copper Glidcop (0.15% Al – balance Cu) Other Potential Phase II Materials: Super Invar Gum Metal Other Materials to be (re)tested 2D Carbon-Carbon 3D Carbon-Carbon

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 11 / 14 Jaw Positioning Forces – Phase I => Phase II Jaw end springs will be sized as com- promise 1) bending-generated force applied to nut 2) static deflection due to jaw weight Pull-in headroom expressed as force at nut Upper jaw - shown Lower jaw Jaw deflection = 400 um for 1 hr beam lifetime case, 1200 um for 10 sec minute lifetime power level

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 12 / 14 Bimetallic jaw (SST/Cu): no benefit Solid Cu beneficial SST/Cu Baseline Hollow Cu Solid Cu No benefit from SST core – same CTE as Cu, poor conductivity – temperature distribution unchanged. Cu core => alt heat path to opposite side, reduces  T therefore bending.

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 13 / 14 Alternative Shaft Materials Shaft supported case - No Major Improvement Deflection is combo of bending & swelling

ILC R&D Status - 19 June 2006 Rotatable Collimators - T. Markiewicz Slide n° 14 / 14 Alternative Shaft Materials Central stop-supported case - No Improvement