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Strong-strong and coherent beam-beam effects

Strong-strong and coherent beam-beam effects. Xavier Buffat (CERN, EPFL). Nicolas Mounet & Lenny Rivkin. Paul A. Goergen ( TU Darmstadt). Coherent beam-beam and Impedance Beam-beam and Impedance by Simon White Coherent modes in LHC by Xavier Buffat

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Strong-strong and coherent beam-beam effects

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  1. Strong-strong and coherent beam-beam effects Xavier Buffat(CERN, EPFL) Nicolas Mounet & Lenny Rivkin Paul A. Goergen (TU Darmstadt)

  2. Coherent beam-beam and Impedance • Beam-beam and Impedance by Simon White • Coherent modes in LHC by Xavier Buffat • Coherent modes in Tevatron by Giulio Stancari • Instrumentation and observations • Digitized BPM signals by Giulio Stancari • Orbit effects in LHC by Michaela Schaumann • Ultrafast orbit effects by Tobias Baer • BTF measurements by Paul Görgen

  3. Single bunch: Head-on & long range • Full head-on has a clear stabilizing effect even without chromaticity, octupolesor damper Head-on, small ξ Long range Chromaticity Chromaticity

  4. Multi bunch: complexity • COMBI code for 36x36 bunches colliding in one IP Courtesy of T. Pieloni

  5. Michaela Shaumann - Observed Beam-Beam Induced Orbit Effects at LHC

  6. Beam Dump on 8.7.2012 • Beam dump trigger by B2 LL-RF (cryo problem). Unusual single-turn losses on B1 in before beam dump. 100mV 1 turn Dump B1 1 turn 300mV · 1380b≈ 0.6 Gy/s at BLMEI.06L7.B1E10_TCHSH.6L7.B1 RS1 50µs 08.08.2012 20:46 Signal from B1 diamond BLM in IR7.

  7. First Turn Horizontal • Phase of oscillation very well explained. • Simulated oscillation amplitude 40% smallerthan measured amplitude. • Good agreement between simulations of Gaussian beam and particle in bunch centre. IP5 IP5 IP1 Simulation and measurement for bunches with full long range interactions. Not all BPMs have a valid acquisition, in some areas data is only available for BPMs at low beta function.

  8. Coherent beam-beam and Impedance • Good start in treating beam-beam and impedance,lots of work ahead, some very promising results • Instrumentation and observations • LHC needs many observables to help unravel the rich structure of this «universal» machine – on to 25 ns and beyond!Diagnostics • does not have to be interesting • does not have to be 120% right • IT HAS TO BE USABLE AND BE USED

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