Author: Zheng, Q.
Paper Title Page
MOP290 Self Excited Operation for a 1.3 GHz 5-cell Superconducting Cavity 660
 
  • K. Fong, M.P. Laverty, Q. Zheng
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • E.P. Chojnacki, G.H. Hoffstaetter, D. Meidlinger, S.P. Wang
    CLASSE, Ithaca, New York, USA
 
  Self-Excited operation of a resonant system does not require any external frequency tracking as the frequency is determined by the phase lag of the self-excited loop, it is therefore particularly useful for testing high Q RF cavities that do not have an automatic tuning mechanism. Self-exited operation has long been shown to work with single-cell cavities. We have recently demonstrated that it is also possible for multi-cell cavities, where multiple resonant modes are present. The Cornell 1.3 GHz 5-cell superconducting cavities was operated using Self-Excited operation and we were able to lock to the accelerating (pi) mode, despite the presence of neighbouring modes that are less than 10 MHz away. By means of the loops phase advance, we were able to select which mode was excited.