Keyword: coherent-effects
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THPOA14 Ion Effects in the APS Particle Accumulator Ring ion, simulation, vacuum, emittance 1123
  • J.R. Calvey, K.C. Harkay, C. Yao
    ANL, Argonne, Illinois, USA
  Trapped ions in the APS Particle Accumulator Ring (PAR) lead to a positive coherent tune shift in both planes, which increases along the PAR cycle as more ions accumulate. This effect has been studied using an ion simulation code developed at SLAC. After modifying the code to include a realistic vacuum profile, multiple ionization, and the effect of shaking the beam to measure the tune, the simulation agrees well with our measurements. This code has also been used to evaluate the possibility of ion instabilities at the high bunch charge needed for the APS-Upgrade.  
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