离子俘获的线性理论及其应用

从线性理论出发,研究了电子束团在储存环里均匀分布和束团串两种情况下离子俘获的条件;在离子系统里引入Twiss参量,推导出电子束团串俘获离子的阈值流强的公式;并以此讨论北京正负电子对撞机(BEPC)在同步辐射专用运行时观察到的电子束流现象,提出采用束团串运行来克服BEPC中的束流寿命下降.

Linear Theory of Ion Trapping and Its Application

The conditions for ion trapping are studied in the case of uniformly distributed electron bunches and bunch trains in storage rings based on the linear theory. The formulas of the threshold current for ion trapping are derived by means of the Twiss parameters in the ion focused system. Based on the theory, the beam behavior observed in the dedicated synchrotron radiation operation of the Beijing Electron-Positron Collider (BEPC) is discussed. It is proposed to apply the bunch than in the BEPC storage ring in order to overcome the beam lifetime drop during the single electron beam operation.