Fluorescence lifetime measurement from a designated single-bunch in the BEPCⅡ colliding mode  

作　　者：孙帅帅 徐广磊 雷革 黄艳 高振华 张智印 陶冶 

机构地区：[1]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences [2]Accelerator Center,Institute of High Energy Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics C》2011年第10期969-973,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10635060,20871116);Innovation Fund of Institute of HighEnergy Physics (IHEP)

摘　　要：Fluorescence lifetime measurement in the time domain requires excitation from a well separated single bunch using synchrotron light sources. In the colliding mode of the Beijing Electron Positron Collider Ⅱ （BEPCⅡ）, a hybrid filling pattern was realized such that a single bunch was placed in the middle of a large gap between two multi-bunch groups. Detection of fluorescence lifetime, based on the excitation of the light pulse from this designated single-bunch, was established at Beamline 4B8 of the Beijing Synchrotron Radiation Facility （BSRF）. The timing signal of the BEPCII was utilized as a trigger to gate this fluorescence event. L-Tryptophan amino acid, a known lifetime standard, was selected to assess the lifetime measurement performance. The measured lifetime was consistent in both colliding and single-bunch mode with the time resolution down to 450 ps. Moreover, both the bunch purity and the fine structure of the hybrid filling pattern were characterized.Fluorescence lifetime measurement in the time domain requires excitation from a well separated single bunch using synchrotron light sources. In the colliding mode of the Beijing Electron Positron Collider Ⅱ （BEPCⅡ）, a hybrid filling pattern was realized such that a single bunch was placed in the middle of a large gap between two multi-bunch groups. Detection of fluorescence lifetime, based on the excitation of the light pulse from this designated single-bunch, was established at Beamline 4B8 of the Beijing Synchrotron Radiation Facility （BSRF）. The timing signal of the BEPCII was utilized as a trigger to gate this fluorescence event. L-Tryptophan amino acid, a known lifetime standard, was selected to assess the lifetime measurement performance. The measured lifetime was consistent in both colliding and single-bunch mode with the time resolution down to 450 ps. Moreover, both the bunch purity and the fine structure of the hybrid filling pattern were characterized.

关 键 词：fluorescence lifetime time-correlated single-photon counting （TCSPC） synchrotron radiation hybrid filling pattern bunch purity 

分 类 号：O572.214[理学—粒子物理与原子核物理]