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U.S. FCAL Efforts

U.S. FCAL Efforts. William Morse - BNL. U.S. Interests. BNL – BeamCal, GamCal Yale – GamCal Colorado – SUSY studies Morse is the SiD forward coordinator Have submitted GamCal R&D Proposal to DOE Preparing BeamCal R&D Proposal to DOE. U.S. Interests. BNL PI: W. Morse

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U.S. FCAL Efforts

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  1. U.S. FCAL Efforts William Morse - BNL FCAL Munich October 17 2006 W.M. Morse

  2. U.S. Interests • BNL – BeamCal, GamCal • Yale – GamCal • Colorado – SUSY studies • Morse is the SiD forward coordinator • Have submitted GamCal R&D Proposal to DOE • Preparing BeamCal R&D Proposal to DOE FCAL Munich October 17 2006 W.M. Morse

  3. U.S. Interests • BNL PI: W. Morse • F. Lanni, D. Lissauer: BeamCal readout issues • Z. Li: radiation damage issues • B. Parker: machine interface issues • Yale PI: M. Zeller • G. Atoian, V. Issakov, A. Poblaguev: GamCal design issues • Colorado PI: U. Nauenberg: SUSY studies FCAL Munich October 17 2006 W.M. Morse

  4. BeamCal Radiation Damage • 10MGy/yr from electrons • 21014 n/cm2 per yr, mainly from giant dipole resonance (10-40 MeV NnN*) • Zheng Li (BNL Instrumentation) recommends high resistivity MCZ Si cooled to -10C FCAL Munich October 17 2006 W.M. Morse

  5. SiD 14mr with anti-solenoid FCAL Munich October 17 2006 W.M. Morse

  6. SiD Anti-Solenoid Magnet • Brett Parker (BNL) design – see VLCW06 talk • Lower B affects pairs and also backsplash to vertex detector FCAL Munich October 17 2006 W.M. Morse

  7. Fast Feedback • The ILC fast feedback team requests a signal at 3MHz with low latency almost proportional to actual luminosity for fast optimization • Comprehensive info at 5Hz to a data base (still to be defined) FCAL Munich October 17 2006 W.M. Morse

  8. Achieving the Design Luminosity Will Be a Challenge • Bunch P- (t) {N, E, x, y, z, x, y, z, xy, x, y} • Bunch P+(t) {N, E, x, y, z, x, y, z, xy, x, y} • Instantaneous Luminosity: y x FCAL Munich October 17 2006 W.M. Morse

  9. Run Time Measurements • Beam-beam deflections (pickup electrodes) • Beam-strahlung gammas (GamCal) • Beam-strahlung pairs (BeamCal) • We need robust and complementary information FCAL Munich October 17 2006 W.M. Morse

  10. Beam-strahlung • F = e(E + cB). Bmax  1KT • Instantaneous power radiated: • P  3% Pe N  1.5Ne • Bethe-Heitler: e → e e+e- • BH  38 mb • <E>  1GeV • Landau-Lifshitz: ee → ee e+e- • LL  19 mb • <E>  0.15GeV • Other processes much smaller • C. Rimbault et al., Phys Rev ST AB 9,034402 (2006). FCAL Munich October 17 2006 W.M. Morse

  11. Bethe-Heitler Pairs • e → e e+e- For left and right detectors separately: N+/xy and N-/xy. Question: How well does this really work? Answer: Needs simulation. FCAL Munich October 17 2006 W.M. Morse

  12. Landau-Lifshitz Pairs • ee → eee+e- For left and right detector equally 1 GeV FCAL Munich October 17 2006 W.M. Morse

  13. Simulations • W. Morse (BNL) • W. Lohman, E. von Oelson, and M. Ohlerich (DESY Zeuthen) • To Be Submitted as an ILC Note • Guinea Pig simulations varying some of the 500 GeV ILC bunch parameters around nominal values FCAL Munich October 17 2006 W.M. Morse

  14. Vertical offset E BeamCal (TeV) FCAL Munich October 17 2006 W.M. Morse

  15. Vertical Offset R (10-6) FCAL Munich October 17 2006 W.M. Morse

  16. Bunch Width BeamCal E (TeV) R 10-6 FCAL Munich October 17 2006 W.M. Morse

  17. Comparison • Sign of dE/d(bunch characteristic) at design values. Note that all five lines are different, which means complementary information. FCAL Munich October 17 2006 W.M. Morse

  18. Bunch Height FCAL Munich October 17 2006 W.M. Morse

  19. Bunch Length FCAL Munich October 17 2006 W.M. Morse

  20. Is There More Info in BeamCal? • T.Tauchi,K.Yokoya • Phys Rev E51,6119(95) • 6<r<7cm azimuthal dist • But, Moliere dia. 2cm! • Also, 1 Bhabha/BX! • Thus we need more simulation to show that it is robust enough. FCAL Munich October 17 2006 W.M. Morse

  21. Robust and Complementary Luminosity, ie. R, is low. Note that all columns are different, ie. complementary information. FCAL Munich October 17 2006 W.M. Morse

  22. Large Crossing Angle GamCal Gas jet followed by a 1m long 1.5T dipole magnetic field. Trajectories of positrons of momentum 0.1, 1, and 10 GeV/c are shown. FCAL Munich October 17 2006 W.M. Morse

  23. GamCal Backgrounds FCAL Munich October 17 2006 W.M. Morse

  24. Conclusions • We need robust, redundant information: • Beam-beam deflections • Beam-strahlung gammas • Beam-strahlung pairs • E(pairs)/E(gammas) particularly valuable • Largely proportional to instantaneous luminosity FCAL Munich October 17 2006 W.M. Morse

  25. Extra Slides FCAL Munich October 17 2006 W.M. Morse

  26. 1 2 y - + z FCAL Munich October 17 2006 W.M. Morse

  27. Perfect Collisions FCAL Munich October 17 2006 W.M. Morse

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