扭摆器中的微束团不稳定性(英文)

Microbunch Instability in Wigglers

用理论和数值的方法,首次研究了扭摆器中相干同步辐射效应诱发的微束团不稳定性.这一不稳定性只存在于小能散的情况,并当电子能量或峰值磁场取特定值时,不稳定度达到最大值.在BFEL的扭摆器中,可能有轻微的不稳定性存在;在CTF的扭摆器中,则不会有不稳定性发生.

We studied the microbunch instability in wigglers induced by coherent synchrotron radiation（CSR）theoretically and numerically for the first time.This instability occurs only at very small energy spread,and reaches maximum when the energy of electrons and the peak value of the magnet field adopt specific values.Results show that the instability may slightly exist in the wiggler of Beijing Free Electron Laser（BFEL）,but does not happen at all in the wigglers of the proposed China Test Facility（CTF）for the X-ray free electron laser.