Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
In the BEPC electron-positron storage ring, the bunch length and its lengthening are quite important characters. It determines the efficiency of getting physical events and the luminosities achievable, and it plays a key role in the upgrade of BEPC. Because of advantages of precision and visualisation, streak camera is commonly used to measure the beam length in accelerators. In this paper we describe the operation principle, the features and the basic system configuration of the streak camera. The systematic and random errors in the, measurement are analysed. Some typical results of measurement in recent years are presented.