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Description
Conventional TCSPC bunch-length measurements are degraded by low-frequency longitudinal phase drift. A previously proposed dynamic compensation method based on BPM zero crossing extraction was validated in single bunch mode, but multi bunch operation introduces additional challenges: system delay misassignment and baseline superposition in BPM waveforms. This paper extends the method to the “2 + 35” multi bunch filling mode of the HLS II storage ring. Using a dual channel oscilloscope to simultaneously acquire PMT sin-gle photon pulses and BPM signals, offline processing incorporates dCFD, per bunch zero crossing detection, and a delay scan calibration. Independent longitudinal profiles of all 37 bunches are reconstructed, all exhibiting clean Gaussian single peak shapes with consistent cen-troids. The average bunch length is about 232 ps, with a relative standard deviation of approximately 3% across bunches. The results demonstrate that the method effec-tively eliminates phase drift, requires simple hardware, and is robust for routine multi bunch operation, making it readily transferable to other storage rings.
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| Supervisor's name | Yongbin Leng |
| Supervisor's email | lengyb@ustc.edu.cn |
| Paper submission software | MSWord |