Author: Shin, S.
Paper Title Page
THOYGD3
Online Measurement of Bunch Lengths and Fill-pattern in the PLS-II Storage Ring Using a Fast Photodiode  
 
  • W.J. Song
    POSTECH, Pohang, Republic of Korea
  • T. Ha, G. Hahn, Y.D. Joo, D. Kim, Y.S. Lee, S. Shin
    PAL, Pohang, Republic of Korea
  • J.-G. Hwang
    HZB, Berlin, Germany
 
  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.  
slides icon Slides THOYGD3 [3.611 MB]  
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THPOTK007 Magnet Systems for Korea 4GSR Light Source 2781
 
  • D.E. Kim, T. Ha, G. Hahn, Y.G. Jung, H.-G. Lee, J. Lee, S. Shin, H.S. Suh
    PAL, Pohang, Republic of Korea
 
  Funding: Work supported by NRF of the Republic of Korea.
A 4th generation storage ring based light source is being developed in Korea since 2021. It features < 100 pm rad emittance, about 800 m circumference, 4 GeV e-beam energy, full energy booster injection, and more than 40 beamlines which includes more than 24 insertion device (ID) beamlines. This machine requires about ~1000 magnets including dipole, longitudinal gradient dipole, transverse gradient dipole, sextupoles, and correctors. The apertures are small and the lattice space requirements are very tight. In this report, a preliminary design of the each magnet is presented with detailed plan for the future.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOTK007  
About • Received ※ 13 June 2022 — Accepted ※ 20 June 2022 — Issue date ※ 07 July 2022  
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