JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB 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. AU - Shin, S. ED - Zimmermann, Frank ED - Tanaka, Hitoshi ED - Sudmuang, Porntip ED - Klysubun, Prapong ED - Sunwong, Prapaiwan ED - Chanwattana, Thakonwat ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker R.W. TI - Online Measurement of Bunch Lengths and Fill-pattern in the PLS-II Storage Ring Using a Fast Photodiode J2 - Proc. of IPAC2022, Bangkok, Thailand, 12-17 June 2022 CY - Bangkok, Thailand T2 - International Particle Accelerator Conference T3 - 13 LA - english AB - Providing bunch lengths and a filling pattern of the bunch train in real-time is one of the important challenges in beam instrumentation of the 3rd generation light source. In particular, the time length and intensity information of the synchrotron light is useful to beamlines and their users who perform time-resolved experiments. We developed an online monitoring system that can measure bunch lengths and a filling pattern simultaneously by directly observing the synchrotron radiation with a picosecond-resolution photodiode and high input analog bandwidth digitizer. We adopted the Gaussian deconvolution method to restore the original waveform of synchrotron radiation using the system impulse response function of 29 ps in RMS which was obtained from a 100 fs length laser pulse experiment. In this paper, we present the experimental setup and signal processing method in detail as well as the online measurement results of the bunch length and filling pattern using the fast photodiode in the PLS-II. PB - JACoW Publishing CP - Geneva, Switzerland ER -