Title :
Tracking simulations near half-integer resonance at PEP-II
Author :
Cai, Y. ; Nosochkov, Y.
Author_Institution :
SLAC, Menlo Park, CA, USA
Abstract :
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 β distortion after correction was investigated.
Keywords :
beam handling equipment; betatrons; particle beam diagnostics; storage rings; LEGO code; PEP-II luminosity; beam-beam simulation; beta distortion; chromatic perturbation; dispersion function; dynamic aperture; half-integer resonance region; high energy ring; horizontal betatron tune; interaction region; local sextupole optimisation; low energy ring; residual orbit; synchrotron sidebands; tracking simulation; Apertures; Gold; Lattices; Linear particle accelerator; Nonlinear optics; Optical tuning; Orbital calculations; Predictive models; Resonance; Synchrotrons;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289095
