NLC - The Next Linear Collider Project IR Working Group Summary Tom Markiewicz LC R&D Workshop, UCSC June 29, 2002

Tom Markiewicz NLC - The Next Linear Collider Project IR Group People NLC Accelerator Physics Group NLC Beam Delivery & IR Group LLNL  Group University Groups –Oxford University –U. of British Columbia –Northwestern University –U. of Massachusetts

Tom Markiewicz NLC - The Next Linear Collider Project -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  IR Issues

Tom Markiewicz NLC - The Next Linear Collider Project One Parallel Session Background Update –Takashi Maruyama / SLAC IR Layout & R&D Status –TWM / SLAC SLC  Testbed –Jeff Gronberg / LLNL Polarization Measurements at SLC  Testbed –Sahal Yacoob / NorthWestern University

Tom Markiewicz NLC - The Next Linear Collider Project Background Simulation Results

Tom Markiewicz NLC - The Next Linear Collider Project User Files Available Direct hits on VXD from 1900 bunches: –/afs/slac/www/accel/nlc/local/systems/beamdelivery/g uinea_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?

Tom Markiewicz NLC - The Next Linear Collider Project Beamline: Collimators & Synchrotron Radiation IP Spoilers & Absorbers R=1cm SR Photons at IP Collimation Depth: Was: 8  x x 40  y Now: 19  x x 52  y 400  m 850  m 10 7 Halo left after E_Slit E_Slit Oct Off Oct On

Tom Markiewicz NLC - The Next Linear Collider Project 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

Tom Markiewicz NLC - The Next Linear Collider Project IP Girder Test Concept STS2 Witness IFO.A. IF 7m.5m 4.5m –Support tube (Carbon fiber?) –Permanent magnet or model –Interaction with external solenoid field –Hard or soft actuators –Beam pipe & vacuum

Tom Markiewicz NLC - The Next Linear Collider Project LCD-L2 (3T) with 3.8m L* Optics Snowmass 2001 QD0 SD0 M1 Calorimeter Pair LumMon M2 Beampipe Low Z shield 32 mrad M1 acceptance Support Tube 6.3 mrad Lum-Mon acceptance 1 mrad exit aperture QF1 SF1 52 mrad Cal acceptance Feedback BPM & Kicker

Tom Markiewicz NLC - The Next Linear Collider Project Current IR Thinking M1 M2 36 mrad M1 acceptance 117 mrad Cal acceptance 25 cm radius support tube

Tom Markiewicz NLC - The Next Linear Collider Project Final Doublet Magnet Technology MagnetApertureGradientRmaxZ_ipLength QD01.0 cm144 T/m5.6cm3.81 m2.0m QF11.0 cm36.4 T/m2.2cm7.76 m4.0 m

Tom Markiewicz NLC - The Next Linear Collider Project Photon Collider Testbed Hardware Optical Assembly 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? ½ scale version of the NLC design Position of final quads in SLC sets the scale Final focus optics are fixed Steering mirrors are on piezo movers

Tom Markiewicz NLC - The Next Linear Collider Project Engineering Test Facility at SLC Beam Energy DR  x,y (m-rad) FF  x,y (m-rad)  x /  y  z  x,y N  30 GeV 1100 / 50  8 / 0.1 mm 0.1 – 1.0 mm 1500/55nm 6.0E9

Tom Markiewicz NLC - The Next Linear Collider Project Photon Collider Testbed Hardware ½ Scale prototype of optics / alignment system is currently under construction Beampipe Alignment System

Tom Markiewicz NLC - The Next Linear Collider Project 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