Electron cloud simulations for the main ring of J-PARC

8th International Particle Accelerator Conference

Yee-Rendon, Bruce^1 ; Muto, Ryotaro^1 ; Ohmi, Kazuhito^1 ; Satou, Kenichirou^1 ; Tomizawa, Masahito^1 ; Toyama, Takeshi^1

KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki

305-0801, Japan^1

关键词: Beam extraction;    Beam instability;    Computational model;    Electron clouds;    High intensity beam;    Potential threats;    Strong dependences;    Trigger conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012065/pdf
DOI  :  10.1088/1742-6596/874/1/012065

来源: IOP

【 摘 要 】

The simulation of beam instabilities is a helpful tool to evaluate potential threats against the machine protection of the high intensity beams. At Main Ring (MR) of J-PARC, signals related to the electron cloud have been observed during the slow beam extraction mode. Hence, several studies were conducted to investigate the mechanism that produces it, the results confirmed a strong dependence on the beam intensity and the bunch structure in the formation of the electron cloud, however, the precise explanation of its trigger conditions remains incomplete. To shed light on the problem, electron cloud simulations were done using an updated version of the computational model developed from previous works at KEK. The code employed the signals of the measurements to reproduce the events seen during the surveys.