LARP Phase II Secondary Collimator Status Report SLAC ILC R&D Summary Meeting 24 April 2006 T. Markiewicz/SLAC

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 2 / 15 Status of Phase II Rotating Collimator Project at Pheasant Run LARP Mtg. SLAC and CERN agree on an initial set of specifications for the first mechanical prototype RC1 –Put a new vacuum tank with cylinder jaws that fits LHC spatial constraints on a CERN Phase I base and use CERN Phase I scheme for jaw alignment and cooling input –Provide 12kW cooling to each 136mm x 95cm jaw through flexible tubing –Relax 25um flatness tolerance but provide flexible jaw support and a central stop mechanism to ensure thermal bowing is AWAY from beam 400 um sagitta for 1 hr beam lifetime engineering steady state 1200 um sagitta for 12min beam lifetime 10 second transient

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 3 / 15 Progress of Phase II Rotating Collimator Project since Pheasant Run LARP Mtg. RC1 Prototype Conceptual Design Report –reviewed and accepted by CERN and suggestions incorporated –independent review 12/15/05 Lou Bertolini-LLNL, Alex Makarov-FNAL, Bill Turner (LBL) Major Findings: Fine, but …. –Do not ‘cut metal’ until jaw support and stop scheme developed »In progress –Check thin-Cu over Stainless for performance √ No improvement –Increase engineering effort Full time engineer (Steve Lundgren) and designer hired 3 April Current Activities: –Braze tests of cooling coils beginning –Prep for full cooling & deformation tests –Acquisition of Phase I support & mover assemblies –Redrawing of CERN parts for US fabrication

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 4 / 15 Unresolved Jaw Support Issues Support needs to: hold ~100kg jaw to 5-10um accuracy not sag under gravity for vertical and skew orientations permit ~1200 um flex for 10 second bursts of 60kW energy deposition work with torque of Phase I stepping motors

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 5 / 15 Unresolved Central Stop Issues Interplay between alignment scheme independent motion of each end of each jaw and stop must be on beam centerline this can vary ±5mm/ store Reproducibility of alignment on successive stores May use two stops to control tilt Slot deep enough to avoid damage in accident Stop far enough from beam to never be damaged & is out of way at injection

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 6 / 15 Unresolved Issues with Jaw Rotation Torque required to rotate 360 understood and is substantial; Coil “creep” may alleviate. Details of actuator not yet worked out Interference with RF parts and gross jaw adjustment during injection not studied

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 7 / 15 FY06 Goals of Phase II Rotating Collimator Project and Beyond Work Plan outlined 10/6/ Single jaw thermal test: one jaw with internal helical cooling channels to be thermally loaded for testing the cooling effectiveness and measuring thermal deformations. 2.Full RC1 prototype: a working prototype for bench top testing of the jaw positioning mechanism, supported to simulate operation in all necessary orientations, but not intended for mounting on actual beamline supports with actual beamline, cooling, control and instrumentation connections. Deliverables listed 10/6/ Final version of RC1 CDR: Awaiting support/stopper design 2.External review of RC1 CDR: √ 3.Performance report on RC1: Progress delayed ~6 months due to reviews & manpower issues New Plan: Slip schedule ~6 months –Single jaw tests, support/stopper design & write-up by EOFY06 –RC1 performance report by mid FY07 –$400k returned to LARP management in FY06 adjustment –Expect slippage of Jan 2008 beam-testable RC2 delivery consistent with CERN’s latest schedule

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 8 / 15 LARP Phase II Secondary Collimator RC1 Collimator Test Plan (slides prepared by Steve Lundgren) Near term –Jaw/Cooling Tube Joint Development –Single Jaw Thermal Tests Later this year…… –Design and fab hardware for Mechanical Prototype Tests

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 9 / 15 Jaw/Cooling Tube Joint Development Purpose: determine appropriate joint configuration & fabrication methods Square hollow magnet conductor for first test ~ 9 mm x 9 mm Copper jaw and mandrel Cu-Au braze After first braze, machine coil o.d. for correct fit to jaw i.d. After second braze, section assy to inspect coverage Round tubing with grooved (?) mandrel is next Cooling Tube Jaw Center Mandrel ~100 mm ~70 mm dia ~100 mm dia

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 10 / 15 Development/Test Lab Itemavailability Chillerexisting Vacuum equip’tSLAC misc? Heater controllerselect/buy Gantryselect/buy Tools, tableselect/buy Instrumentationselect/buy Power/waterto be installed

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 11 / 15 Single Jaw Thermal Test Purpose: measure cooling effectiveness and thermal deformations Internal helical cooling tube Collimator midpoint stop and flexible end supports Commercial electric resistance heaters, coupled with thermal grease –SS power ~10 kW, evenly distributed –No transient testing –FE model test => validation of simulations No Jaw rotation Inert gas atmosphere or vacuum chamber…TBD

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 12 / 15 Single Jaw Thermal Test setup Reference bar, water cooled to maintain straightness (radiation shield ?) Standoffs fix jaw distance to reference bar at center Capacitive proximity sensors at ends Flexible end mounts 2 x 5 kW heaters, coupled with thermal grease Orientation: may be rotated 90 o, or 180 o or on end Thermocouples measure temperature distribution

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 13 / 15 Single Jaw Test Thermocouple Locations Thermocouples are recessed into Jaw slightly below the surface Spaced along Heater length and around Jaw circumference Should yield the Jaw heating profile predicted by the FE analysis 12 x Thermocouples 2 x 5kW Heaters

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 14 / 15 RC1 Mechanical Prototype Test Purpose: bench top testing of the jaw actuating mechanism in CERN orientations Vacuum tank with easy access CERN adjustment mechanism Realistic cooling water feed-throughs and flexible connections Simplistic control system for jaw aperture and rotation. Minimal instrumentation connections for position, temperature, etc. –RC2 will incorporate LHC-compliant interfaces Heat loading may not be possible Use CERN Phase I components as appropriate

ILC R&D Status Meeting April 2006 Phase II Secondary Collimators - T. MarkiewiczSlide n° 15 / 15 RC1 Mechanical Prototype FY08, RC2 FY07 RC1 consists of jaws, tank & actuators - evaluated for horizontal (shown), vertical (90 o ) and skew (+/- 45 o ) orientations. Variant: use CERN vac tank, dummy jaws of correct weight