Distortion of Crabbed Bunch Due to the Electron Cloud

[摘要] In order to improve the luminosity, two crab cavities have been installed in KEKB HER and LER [1]. Since there is only one crab cavity in each ring, the crab cavity generates a horizontally titled bunch along the whole ring. The achieved specific luminosity with crabbed bunch is higher, but it is not as high as that from beam-beam simulation [2]. One of the suspicions is the electron cloud. The electron cloud in LER (positron beam) may distort the crabbed bunch and cause the luminosity drop. This note briefly estimates the bunch shape distortion due to the electron cloud in KEKB LER.

[发布日期] 2008-05-28

[学科分类] 核物理和高能物理

[关键词] STORAGE RINGS;CAVITIES;BEAM LUMINOSITY;BEAM SHAPING;BEAM BUNCHING;POSITRON BEAMS;BEAM DYNAMICS Accelerators;ACCPHY