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TY - CONF AU - Song, W.J. AU - Ha, T. AU - Hahn, G. AU - Hwang, J.-G. AU - Joo, Y.D. AU - Kim, D. AU - Lee, Y.S. ED - Kim, Changbum ED - Schaa, Volker R. W. ED - Kim, Dong-Eon ED - Lee, Jaeyu TI - Development of an On-Line Bunch Length Monitoring System at PLS-II Using an Ultrafast Photodiode J2 - Proc. of IBIC2021, Pohang, Rep. of Korea, 24-28 May 2021 CY - Pohang, Rep. of Korea T2 - International Beam Instrumentation Conference T3 - 10 LA - english AB - Users of time-resolving experiments at 3rd generation synchrotron light sources deem online bunch length and filling pattern monitoring as an important real-time diagnostic. We developed an on-line monitoring system that can measure bunch lengths and filling pattern using a photodiode, a wideband pre-amplifier, and a sampling digitizer. Two different methods were evaluated to reconstruct the bunch lengths: Gaussian deconvolution method as an approximation scheme and Fourier analysis as a method to restore the original signal by using the power transmission characteristics of the electronic devices in the system, including a bias-tee, a wideband amplifier, cables, and the photodiode. A bunch lengthening experiment has been conducted to compare and verify the results of those two methods of the photodiode and the result of the streak camera images by changing the overall gap voltage of the superconducting RF cavities. In this paper, we elaborate upon the said photodiode-based measurement techniques, and present the experimental results. PB - JACoW Publishing CP - Geneva, Switzerland SP - 384 EP - 387 KW - electron KW - experiment KW - synchrotron KW - electronics KW - operation DA - 2021/10 PY - 2021 SN - 2673-5350 SN - 978-3-95450-230-1 DO - doi:10.18429/JACoW-IBIC2021-WEPP10 UR - https://jacow.org/ibic2021/papers/wepp10.pdf ER -