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SLAC Publication: SLAC-PUB-15613
SLAC Release Date: June 18, 2013
Validation of the Microwave Instability in the Damping Ring of SuperKEKB using VFP Solver
Wang, Lanfa.
Microwave instability driven by coherent synchrotron radiation (CSR) impedance in the Damping Ring of Super-KEKB is a concern due to its high bunch current and strong CSR. To confirm the threshold of the instability, we simulate the microwave instability using Vlasov-Fokker-Planck (VFP) solver to provide a benchmark with Particle-In-Cell (PIC) code. The longitudinal wake potential is calculated as a sum of the contributions from the vacuum chamber components distributed around the ring, includin... Show Full Abstract
Microwave instability driven by coherent synchrotron radiation (CSR) impedance in the Damping Ring of Super-KEKB is a concern due to its high bunch current and strong CSR. To confirm the threshold of the instability, we simulate the microwave instability using Vlasov-Fokker-Planck (VFP) solver to provide a benchmark with Particle-In-Cell (PIC) code. The longitudinal wake potential is calculated as a sum of the contributions from the vacuum chamber components distributed around the ring, including geometric and CSR wake fields. The CSR wake is dominant. Our study shows that the threshold is just above the design current and saw-tooth type of instability can be clearly seen above the threshold. Show Partial Abstract
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  • Interest Categories: Accelerator Physics