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

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SUN Shuai-Shuai, XU Guang-Lei, LEI Ge, HUANG Yan, GAO Zhen-Hua, ZHANG Zhi-Yin and TAO Ye. Fluorescence lifetime measurement from a designated single-bunch in the BEPCⅡ colliding mode[J]. Chinese Physics C, 2011, 35(10): 969-973. doi: 10.1088/1674-1137/35/10/016
SUN Shuai-Shuai, XU Guang-Lei, LEI Ge, HUANG Yan, GAO Zhen-Hua, ZHANG Zhi-Yin and TAO Ye. Fluorescence lifetime measurement from a designated single-bunch in the BEPCⅡ colliding mode[J]. Chinese Physics C, 2011, 35(10): 969-973.  doi: 10.1088/1674-1137/35/10/016 shu
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Received: 2011-01-04
Revised: 2011-03-06
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Fluorescence lifetime measurement from a designated single-bunch in the BEPCⅡ colliding mode

Abstract: 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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