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Kawashima, Y.

Paper Title Page
TUPD028 How to Stably Store Electron Beam in a Synchrotron Radiation Facility from the Point of View of an RF System Design 1485
 
  • Y. Kawashima, H. Ego, Y. Ohashi
    JASRI/SPring-8, Hyogo-ken
  • M. Hara
    RIKEN Spring-8, Hyogo
 
  In any synchrotron radiation facilities, the users wish that electron beams are stably stored without beam abortion for as long as possible. It must be recognized that RF system is a main cause of beam abortions. In order to store beam stably, it is necessary for staffs in charge of RF system to foresee various beam instabilities and to take measures. Before discussing coupled-bunch instability problems, one should understand some trivial issues such as ion trapping and fundamental acceleration frequency modulated by high voltage ripple. The former causes transverse mode instability and the latter shakes stored electron beam longitudinally in RF cavities. In newly designed synchrotron radiation facilities, those issues mentioned above should be suppressed before beam commissioning. As for other issues relating with RF system, we would like to state the importance of a water-cooling system with stable temperature for cavities, and the electric earth problem of low level RF system and high voltage power equipment of a klystron. We describe how we have managed those issues in designing of SPring-8 RF system of the storage ring.