Speaker
Description
Abstract: The longitudinal density distribution of electron bunch-es is a critical parameter for evaluating the performance of storage rings. To meet the requirements for real-time, cost-effective, and flexible longitudinal diagnostics for the Hefei Advanced Light Facility (HALF), we have devel-oped a Time-Correlated Single Photon Counting (TCSPC) measurement system based on a general-purpose high-speed oscilloscope at the Hefei Light Source II (HLS-II). Unlike traditional setups relying on dedicated TCSPC modules, this system utilizes an oscilloscope to directly acquire single-photon pulses from a Photomultiplier Tube (PMT). Experiments conducted at the HLS-II beamline successfully recovered the bunch fill pattern and recon-structed the photon arrival time distribution. To address the measurement errors caused by amplitude fluctuations, a post-processing algorithm incorporating Software Con-stant Fraction Discrimination (CFD) and time folding was developed. This approach effectively suppressed the time walk effect and enabled high-resolution reconstruction of the bunch profile. The results demonstrate that this oscil-loscope-based scheme possesses excellent online monitor-ing capabilities, providing a cost-effective technical solu-tion for HALF and similar facilities.
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