Tracking Simulations Near Half-Integer Resonance at PEP-II

Details Tracking Simulations Near Half-Integer Resonance at PEP-II Tracking Simulations Near Half-Integer Resonance at PEP-II

2003-05-20

arxiv.org/abs/physics/0305086v1

Conf.Proc.C030512:2291,2003

Physics

Accelerator Physics

4 pages

Scientific paper

Beam-beam simulations predict that PEP-II luminosity can be increased by operating the horizontal betatron tune near and above a half-integer resonance. However, effects of the resonance and its synchrotron sidebands significantly enhance betatron and chromatic perturbations which tend to reduce dynamic aperture. In the study, chromatic variation of horizontal tune near the resonance was minimized by optimizing local sextupoles in the Interaction Region. Dynamic aperture was calculated using tracking simulations in LEGO code. Dependence of dynamic aperture on the residual orbit, dispersion and distortion of beta function after correction was investigated.

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