Research on time response of photomultiplier tubes

Timing characteristic of photomultiplier tubes is very important for the applications of many high energy and nuclear physics experiments. A characterization system for photomultiplier tubes which is able to calibrate time response has been built up in our lab. Experiments were designed and completed to decide the appropriate timing calibration method for different photomultiplier tubes. The timing of light source and the illumination area during the measurements were proved to affect the calibration results in different extend for different tubes. Details of the experiments and corresponding results will be presented in this proceeding.