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Yang, J.S.

Paper Title Page
MPPP027 Suppression of the Longitudinal Coupled-Bunch Instabilities by the RF Phase Modulation in the Pohang Light Source 1970
 
  • I. Hwang, M. Yoon
    POSTECH, Pohang, Kyungbuk
  • Y.J. Han, E.-S. Kim, J.S. Yang
    PAL, Pohang, Kyungbuk
  
  In the 2.5 GeV Pohang Light Source, we have investigated the suppression of the longitudinal coupled instabilities (CBI) caused by higher order modes (HOMs) of RF cavities. At higher beam current than 170 mA the 758 MHz or 1300 MHz HOMs occurred and the beam could be unstable. The longitudinal CBI could be suppressed by modulating the phase of an RF accelerating voltage at a frequency of 2 times the synchrotron oscillation frequency and by adjusting the water temperatures of the RF cavities. The longitudinal beam oscillations measured by streak camera in synchro-scan mode were shown. The experiment results were compared with the macro particle tracking simulation.  
WPAT014 Sequence Control System of 1-MW CW Klystron for the PEFP 1401
 
  • B.R. Park, J. Choi, M.-H. Chun, Y.J. Han, M.H. Jeong, S.-C. Kim, J.S. Yang, I.H. Yu
    PAL, Pohang, Kyungbuk
  
  Funding: Work support by the PEFP(Proton Engineering Frontier Project), Korea.

Sequence control system of 1-MW CW klystron for the PEFP (Proton Engineering Frontier Project) has been developed in order to drive the 1-MW klystron amplifier. The system is able to control several power supplies and many environment conditions. The hardware of sequence control and the interlock system are based on the Allen-Bradley's SLC500 Program Logic Controller (PLC). Also the system can be controlled by a touch screen at local mode or Ethernet network with high level HMI at remote mode.