北京正负电子对撞机中的束束作用偏转效应

Beam-beam deflection effect in Beijing electron positron collider

利用静电分离器对正负电子束团在垂直方向上的相对轨道偏差进行了扫描,并用数字示波器对束流轨道的变化进行监视,在北京正负电子对撞机(BEPC)上完成了垂直方向上的束束作用偏转效应的观察与测量。实验过程和实验结果可为北京正负电子对撞机改进工程(BEPCⅡ)的对撞调节提供参考依据。把束团之间相对位置偏差的测量转换为对束流偏转角度的测量是可行的,也是有效克服束流位置探测器分辨率不足的一种方法。

It＇s an essential step for the commissioning of electron-positron collider to realize the absolute collision of electron and positron beams at the interaction point. The relative transverse offset between electron and positron beams causes the beam-beam deflection, which can be utilized effectively to detect and control the offset of two beams at the interaction point. Observation and measurement of the beam-beam deflection in vertical plane have been carried out in Beijing electron positron collidor （BEPC） successfully with a digital high-sensitive oscillograph and a pair of electrostatic separators. The study results not only prove the feasibility of this adjustment method but also provide valuable experience for the commissioning of BEPC Ⅱ.