Author: Shoji, Y.
Paper Title Page
WEPC016 Amplitude Dependent Orbit Shift and its Effect on Beam Injection 2040
  • Y. Shoji
    LASTI, Hyogo, Japan
  • T. Nakamura, J. Schimizu, M. Takao
    JASRI/SPring-8, Hyogo-ken, Japan
  The betatron oscillation amplitude dependent orbit shift was measured at the electron storage ring, NewSUBARU. The result roughly agreed with the theoretical calculation. The effect of this shift on the beam injection is discussed using parameters of NewSUBARU and SPring-8. Generally there exists a better side for the injection, the inner side or the outer side of the ring, which depends on the sign of the orbit shift at the injection septum. In case of the NewSUBARU, the beam is injected from the outer side and the shift is positive. The effective thickness of the septum is reduced by the large oscillation amplitude of the injected beam. On the other hand at SPring-8, the beam is injected from the inner side of the ring while the orbit shift is negative. This means that the two rings are using better side for the injection.