Author: Fukui, T.
Paper Title Page
MOPMW009 RF System of the SPring-8 Upgrade Project 414
  • H. Ego, T. Fujita, N. Hosoda, K. Kobayashi, T. Masuda, S. Matsubara, T. Sugimoto
    JASRI/SPring-8, Hyogo-ken, Japan
  • T. Asaka, T. Fukui, T. Inagaki, C. Kondo, H. Maesaka, T. Ohshima, T. Sakurai
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  The RF system of the SPring-8 storage ring has stably generated an accelerating voltage of 16 MV at a frequency of 508.58 MHz since 1997. In the upgrade of the SPring-8, a beam energy is lowered from 8 to 6 GeV and a needed voltage is 7 MV. The upgrade employs multi-bending optics, and shortens the straight sections available for RF accelerating cavities by 30%. On account of the space, the RF system is to be so rearranged that the number of cavities can be reduced to half. The analog low-level RF (LLRF) system in use controls the voltage with sufficiently small deviations of less than 0.1 % in amplitude and less than 0.1 degree in phase, but becomes out-of-dates and hard to be maintained. We plan to replace them with a compact digital LLRF system in the MTCA.4 standard and based on under-sampling scheme. The SACLA linac is used for injecting a low-emittance beam to the ring. Because we have to balance the FEL operation and the beam injection on demand, pulse-by-pulse control of beam parameters is going to be implemented to the SACLA LLRF modules. Furthermore, we build a timing system for injection to a target bucket-position in the ring within a time deviation of 3 ps.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW009  
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