Fluorescence lifetime measurement from a designated single-bunch in the BEPCⅡ colliding mode |
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作者姓名: | 孙帅帅 徐广磊 雷革 黄艳 高振华 张智印 陶冶 |
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作者单位: | 1. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;;2. Accelerator Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China |
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基金项目: | Supported by National Natural Science Foundation of China (10635060,20871116); Innovation Fund of Institute of HighEnergy Physics (IHEP) |
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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.
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关 键 词: | 北京正负电子对撞机 荧光寿命测量 碰撞模式 多束团 北京同步辐射装置 填充图案 同步加速器 时间分辨率 |
收稿时间: | 2011-01-04 |
修稿时间: | 2011-03-06 |
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