M ay 2 00 3 SLAC – PUB – 9812 May 2003 Tracking Simulations Near Half - Integer Resonance at PEP - II 1
نویسندگان
چکیده
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. 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.
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Beam-beam simulation studies for PEP-II and KEKB
We have performed 3D PIC simulations for PEP-II, SuperKEKB and KEKB parameters by using SLAC[1], LBL[3] and KEK[2] code. Input parameters for PEP-II, SuperKEKB and KEKB are listed in table 1, 2, 3, respectively. The simulation results are shown in Fig. 1, 2, 3 and 4. These results are in reasonable agreement. For PEP-II parameter at the LER horizontal tune of 0.5125, Luminosity by KEK code is s...
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