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用国产BWS-5KII型皮秒扫描相机测量了北京正负电子对撞机(BEPC)上极端相对论性运动正负电子束团产生的同步辐射光脉冲的时间结构、光脉冲长度与电子束流强度以及射频源电压的关系.当负电子束流强度由2mA增加到30mA时,光脉冲长度由220ps增加到670ps;在20mA电子束流强度条件下,射频源电压由250kV增加到500kV时,光脉冲长度在500ps到700ps范围内变化.测量系统的时间分辨率为30ps;时间刻度误差±15％,触发晃动小于±200ps.
The time structure of synchrotron radiation pulse generated by the extreme relativistic motion of positive and negative electron bunches in the Beijing Electron Positron Collider (BEPC) was measured by a domestic BWS-5KII picosecond scanning camera. The length of the optical pulse and the electron beam intensity And the relationship between RF source voltage.When the intensity of negative electron beam increased from 2mA to 30mA, the length of optical pulse increased from 220ps to 670ps. When the voltage of RF source increased from 250kV to 500kV under the condition of 20mA electron beam intensity, The length varies from 500ps to 700ps. The time resolution of the measurement system is 30ps; the time ticking error is ± 15% and the triggering wobble is less than ± 200ps.