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IR Working Group Summary

IR Working Group Summary. Tom Markiewicz LC R&D Workshop, UCSC June 29, 2002. IR Group People. NLC Accelerator Physics Group NLC Beam Delivery & IR Group LLNL gg Group University Groups Oxford University U. of British Columbia Northwestern University U. of Massachusetts.

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IR Working Group Summary

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  1. IR Working Group Summary Tom Markiewicz LC R&D Workshop, UCSC June 29, 2002

  2. IR Group People NLC Accelerator Physics Group NLC Beam Delivery & IR Group LLNL gg Group University Groups • Oxford University • U. of British Columbia • Northwestern University • U. of Massachusetts

  3. -20m < Issues < 200m • Backgrounds • Simulations • Final Doublet Magnet Technology • Vibration Stabilization • IR Layout • Instrumentation • L,E,& P Measurements for Physics in Beamline Inst. WG • Vibration Sources: measurement & modeling • gg IR Issues

  4. One Parallel Session • Background Update • Takashi Maruyama / SLAC • IR Layout & R&D Status • TWM / SLAC • SLC gg Testbed • Jeff Gronberg / LLNL • Polarization Measurements at SLC gg Testbed • Sahal Yacoob / NorthWestern University

  5. Background Simulation Results

  6. User Files Available • Direct hits on VXD from 1900 bunches: • /afs/slac/www/accel/nlc/local/systems/beamdelivery/guinea_pig/ver_1999_07_08/nlc500h/pairs/ • LD_direct • SD_direct • Need discussion with relevant groups to determine best way to transfer results on secondary charged particles, photons & neutrons • Results of GEANT or FLUKA runs • Normalized, parameterized energy & spatial or angular distributions?

  7. SR Photons at IP R=1cm Beamline: Collimators & Synchrotron Radiation 107 Halo left after E_Slit IP Oct Off Oct On 100 10 850mm 400mm E_Slit Collimation Depth:Was: 8sx x 40syNow: 19sx x 52sy Spoilers & Absorbers

  8. Inertial Vibration Stabilization Projects • New Sensor • under construction • Simple 3m pseudo-magnet test • Parameters & parts defined • Relative motion of two blocks • Wait for new sensor & retest of single block

  9. STS2 STS2 STS2 STS2 STS2 Witness IF O.A. IF IP Girder Test Concept 4.5m .5m 7m • Support tube (Carbon fiber?) • Permanent magnet or model • Interaction with external solenoid field • Hard or soft actuators • Beam pipe & vacuum 7m

  10. LCD-L2 (3T) with 3.8m L* OpticsSnowmass 2001 52 mrad Cal acceptance 32 mrad M1 acceptance Calorimeter SF1 QF1 M2 M1 SD0 QD0 Feedback BPM & Kicker 6.3 mrad Lum-Mon acceptance Low Z shield Beampipe Pair LumMon 1 mrad exit aperture Support Tube

  11. Current IR Thinking 117 mrad Cal acceptance 36 mrad M1 acceptance M2 M1 25 cm radius support tube

  12. Final Doublet Magnet Technology

  13. Photon Collider Testbed HardwareOptical Assembly ½ scale version of the NLC design Position of final quads in SLC sets the scale • Unknown factor: Optics damage • IP cannot often be opened up to fix the optics • Radiation damage to the coating • Laser power damage to the mirrors • What is the MTBF? Final focus optics are fixed Steering mirrors are on piezo movers

  14. Engineering Test Facility at SLC 30 GeV 1100 / 50 1600 / 160 8 / 0.1 mm 0.1 – 1.0 mm 1500/55nm 6.0E9 Beam Energy DR gx,y (m-rad) FF gx,y (m-rad) x / y  z x,y N

  15. Photon Collider Testbed Hardware½ Scale prototype of optics / alignment system is currently under construction Beampipe Alignment System

  16. Concluding Statement • There are many tools & resources that have been developed already by NLC sponsored “Machine Detector Interface” group • Transfer of tools & projects to fresh faces would help project and provide a relatively easy way into the accelerator R&D world for interested groups or individuals

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