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Strong-strong and coherent beam-beam effects

This paper explores coherent beam-beam effects and impedance in particle accelerators, emphasizing observations from the LHC and Tevatron. Researchers Xavier Buffat, Nicolas Mounet, Lenny Rivkin, and Paul A. Goergen present key findings on head-on and long-range interactions, beam dump behaviors, and ultrafast orbit effects. The study highlights the complexities of multi-bunch collisions as well as the importance of precise instrumentation for diagnostics. Promising results from simulations and measurements pave the way for future research in understanding the intricate dynamics of particle beams.

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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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