Author: Getmanov, Ya.V.
Paper Title Page
WEPWA047 Longitudinal Stability of Multiturn ERL with Split Accelerating Structure 2226
  • Ya.V. Getmanov, O.A. Shevchenko, N. Vinokurov
    BINP SB RAS, Novosibirsk, Russia
  • T. Atkinson
    HZB, Berlin, Germany
  • N. Vinokurov
    KAERI, Daejon, Republic of Korea
  Some modern projects of the new generation light sources use the conception of multipass energy recovery linac with split (CEBAF-like) accelerating structures. One of the advantages of these light sources is the possibility to obtain a small longitudinal beam size. To help reduce it, the longitudinal dispersion should be non-zero in some arcs of the accelerator. However small deviations in voltages of the accelerating structures can be enhanced by induced fields from circulating bunches due to the dependence of the flight time on the energy spread and the high quality factor of the superconducting radio-frequency cavities. Therefore, instabilities related with interactions of the electron bunches and longitudinal modes of the cavities can develop in the installation. Stability conditions for the interactions with fundamental accelerating mode of the split accelerating system are discussed. Numerical simulations are made for two projects - MARS and FSF.