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Beam Simulation at Cornell

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Title: PowerPoint Presentation Author: Ritchie Patterson Last modified by: Ritchie Patterson Created Date: 6/24/2002 6:23:59 PM Document presentation format – PowerPoint PPT presentation

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Title: Beam Simulation at Cornell


1
Beam Simulation at Cornell
  • Main Beam Transport
  • Beam Halo
  • Spin Transport

Gerry Dugan, Lawrence Gibbons, Brian Heltsley,
RP, Dave Rubin, David Sagan
Ritchie PattersonUCSC, June 2002
2
Main Beam Transport
  • What
  • Simulate beam transport from Source to Damping
    Ring and Damping Ring to Dump
  • Why
  • Evaluate emittance dilution in the face of
    wakefields, ground motion and mechanical noise
  • Develop feedback algorithms
  • Write specs for beam instrumentation

3
Main Beam Transport - Tools Status
  • Sophisticated simulations of beam transport from
    the damping ring to dump exist
  • LIAR/DIMAD (SLAC), MERLIN (DESY) PLACET (CERN)
  • Bunch generally represented as macroparticles
  • R-matrix transport includes wakefields, B fields
    up to qudrupole or sextupole, misalignments, BPM
    resolutions

4
Main Beam Transport - Cornell role
  • Help refine simulation tools
  • Develop tuning algorithms
  • Explore utility of simulating Source to Damping
    Ring

5
Beam Halo
  • What
  • Identify sources of beam halo
  • Simulate halo transport
  • Why
  • Halo drives collimation design
  • Affects background in detector
  • Complete understanding of sources of halo has
    been elusive. Eg, SLC simulations significantly
    underestimated halo.

6
Beam Halo studies
  • Investigate halo sources
  • Damping ring
  • Touschek scattered particles
  • RF structure dark current
  • Halo transport
  • Like main beam transport, but harder depends on
    field nonlinearities in magnets

7
Spin Transport
  • LC physics wants longitudinally polarized e-
    beam
  • Common wisdom says that polarization of e- at
    source will be preserved during transport to IP.
  • This project
  • Check the common wisdom by simulating spin
    transport
  • Identify potential sources of depolarization

8
Budget
Year 1 Year 2 Year 3
Grad students (2) 80k 80k 80k
Computing hardw. 10k 20k
TOTAL 80k 90k 100k
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