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Chou, P.J.

Paper Title Page
MPPP005 A New Kicker for the TLS Longitudinal Feedback System 949
 
  • W.K. Lau, L.-H. Chang, C.W. Chen, H.Y. Chen, P.J. Chou, K.-T. Hsu, S.Y. Hsu, T.-T. Yang
    NSRRC, Hsinchu
  • M. Dehler
    PSI, Villigen
 
  A new longitudinal kicker that is modified from the Swiss Light Source (SLS) design to fit into the TLS storage ring. It will be served as the actuator in the longitudinal multi-bunch feedback control loop. Beam coupling impedance has been calculated by Gdfidl with a PC cluster. Previous to the installation of this new kicker, bench measurement has been performed in the laboratory to characterize this new kicker. The experimental setups for bandwidth and coaxial wire measurement of longitudinal coupling impedance and their corresponding test results will be reported. As a cross check, bead-pull measurement has also been done to verify the beam coupling measurement by coaxial wire method at the kicker center frequency. Longitudinal field profile of the accelerating mode along the beam path has also been mapped. High order cavity modes of the kicker have also been observed and their effects on the beam are evaluated.  
MPPP034 Collective Effects in the TLS Storage Ring after the Installation of Superconducting RF Cavity 2360
 
  • P.J. Chou, J. Chen, K.-T. Hsu, C.-C. Kuo, C. Wang, M.-H. Wang
    NSRRC, Hsinchu
 
  A superconducting rf cavity designed by Cornell University was installed in the storage ring at Taiwan Light Source in December of 2004. The purpose of rf system upgrade is to achieve a stored beam current of 400 mA without collective instabilities caused by high-order-modes of rf cavities. Beam measurements related to collective effects are performed. Results are compared with those measured prior to the rf system upgrade. Theoretical studies on collective effects after the rf upgrade are also presented.