摘要
Harmonic cavities(HCs)are widely used in electron storage rings,mainly to increase the Touschek lifetime by lengthening bunches.HCs have become critical components of almost all fourth-generation synchrotron light sources.In addition to the benefits of increasing the Touschek lifetime,they also affect the collective beam instabilities in electron storage rings.However,the influ-ence of HC settings on collective beam instabilities is still not well understood.HCs are typically designed to operate under so-called ideal lengthening conditions,which do not necessarily optimize the suppression of collective beam instabilities.We therefore extended earlier studies of col-lective beam instabilities to consider more general HC settings.We present preliminary studies and analyses of the influences of different HC settings on microwave and transverse mode-coupling instabilities.
基金
supported by the National Natural Science Foundation of China(Nos.11805217 and 11775239)
the Youth Innovation Promotion Association CAS,and NKPSTRD(No.2016YFA0402001).