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Cupolo, J.

Paper Title Page
WEPEA078 Instabilities Related with RF Cavity in the Booster Synchrotron for NSLS-II 2669
 
  • Y. Kawashima, J. Cupolo, H. Ma, J. Oliva, J. Rose, R. Sikora, M. Yeddulla
    BNL, Upton, Long Island, New York
 
 

The booster synchrotron for NSLS-II accepts beam with 200 MeV from a linac and raises its energy up to 3 GeV. In order to raise beam energy up to 3 GeV, a 7-cell PETRA cavity is installed. Beam instabilities related with the cavity are discussed. In particular, in order to avoid coupled-bunch instability, we consider that cooling water temperature for the cavity should be changed to shift frequencies of higher order modes (HOM) to avoid beam revolution lines. To obtain the relation between the temperature dependence of amount of frequency shift in each HOM and cavity body temperature, we carried out the measurement by changing cavity body temperature. From the measurement data, we calculate the required temperature variation. We summarize the results and describe the system design.