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SC AMD Vinod Bharadwaj, SLAC September 27, 2006 “OXFORD MEETING”

SC AMD Vinod Bharadwaj, SLAC September 27, 2006 “OXFORD MEETING”. Introduction SC Concept Eddy Current R&D “Optical Matching Device” - OMD. EM Shower. Conventional. e + to damping rings. POSITRON PRODUCTION SCHEMES. 6 GeV e -. W-Re Target. Undulator-based (from USLCTOS).

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SC AMD Vinod Bharadwaj, SLAC September 27, 2006 “OXFORD MEETING”

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  1. SC AMD Vinod Bharadwaj, SLACSeptember 27, 2006“OXFORD MEETING” • Introduction • SC Concept • Eddy Current R&D • “Optical Matching Device” - OMD Vinod Bharadwaj, SLAC

  2. EM Shower Conventional e+ to damping rings POSITRON PRODUCTION SCHEMES 6 GeV e- W-Re Target Undulator-based (from USLCTOS) Radio-active sources – 22Na 1 curie = 3.7 x 1010 disintegrations/second (not really feasible) Vinod Bharadwaj, SLAC

  3. GENERIC POSITRON SOURCE e-- e-, γ γ L-band NC capture section e+ ~200 MeV target 6-d aperture solenoid, 0.5T flux concentrator SC pre-accelerator to accelerate to damping ring energy ‘adiabatic matching device’ 5T-0.5T Vinod Bharadwaj, SLAC

  4. AMD Parameters and Advantage • Enhanced positron capture • Factor of two for downstream field • 40 % extra for target submerged in field Vinod Bharadwaj, SLAC

  5. Existing Technique - PULSED FLUX CONCENTRATOR For ILC – very long pulse needed 1 ms, flattop Possible, but not easy (15 kW LN2 cooling) No target field immersion Need prototype CAN A DC DEVICE WORK?? Vinod Bharadwaj, SLAC

  6. Pulsed AMD Challenges • Device pulsed for ~ 200K pulses at ~ 0.4 Hz • For ILC – • very long pulse needed, 1 ms • flattop • Possible, but not easy • (15 kW LN2 cooling) • mechanical impulses • No target field immersion • Need prototype • CAN A DC DEVICE WORK?? Vinod Bharadwaj, SLAC

  7. DC AMD CONCEPT (VB, Kashikhin-FNAL) Vinod Bharadwaj, SLAC

  8. Field Profile Vinod Bharadwaj, SLAC

  9. SC AMD Parameters ISSUES • Advantages • DC object • Target immersed in magnetic field • Questions • Eddy Currents • Beam energy deposition in solenoid • Solenoid activation Vinod Bharadwaj, SLAC

  10. CRITICAL R&D • Critical R&D Issues • Need to determine whether DC device will work • Need to determine extentof immersion enhancement • Need to understand eddy current issues experimentally, analytically and numerically • Eddy Currents • Did one experiment at SLAC • Results did not agree with MAXWELL 3D simulation • No good analytic understanding of problem • Full blown experiment needed Vinod Bharadwaj, SLAC

  11. Cu Disk Strain Gauges NdFeB Magnet Vinod Bharadwaj, SLAC

  12. Magnetic Field Map Vinod Bharadwaj, SLAC

  13. Vinod Bharadwaj, SLAC

  14. Full Blown Eddy-Current Experiment • Need good simulation and analytic “feel” for the problem • Target wheel • Actual size - ~ I meter diameter wheel • Actual material – Ti6Al4V • No cooling – not needed for this test • No vacuum seals – can be done at atmosphere • Target wheel motor • Enough to spin it with a rim speed of 150 m/s (nominal is 100 m/s) • Solenoid • > 10 tesla coil field • > 5 tesla at the target • Made in Russia??? • Instrumentation – temperature, torque, motor power, protection • Place to do experiment - Cockcroft?? • Time scale - ideally results by Fall 2007 Vinod Bharadwaj, SLAC

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