Electron cloud and space charge effects in the Fermilab Booster

Ng, K.Y. ; /Fermilab

关键词: BUILDUP;    CLOUDS;    ELECTRONS;    FERMILAB;    LANDAU DAMPING;    MAGNETS;    ORIGIN;    SECONDARY EMISSION;    SPACE CHARGE Accelerators;   

DOI  :  10.2172/917873
RP-ID  :  FERMILAB-FN-0803-AD
PID  :  OSTI ID: 917873
Others  :  TRN: US0805169

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The stable region of the Fermilab Booster beam in the complex coherent-tune-shift plane appears to have been shifted far away from the origin by its intense space charge making Landau damping appear impossible. Simulations reveal a substantial buildup of electron cloud in the whole Booster ramping cycle, both inside the unshielded combined-function magnets and the beam pipes joining the magnets, whenever the secondary-emission yield (SEY) is larger than {approx}1.6. The implication of the electron-cloud effects on the space charge and collective instabilities of the beam is investigated.