Author: Marutsuka, K.
Paper Title Page
WEXAS0102 SuperKEKB Operating Experience of RF System at High Current 131
 
  • M. Nishiwaki, T. Abe, K. Akai, S. Enomoto, T. Furuya, A. Kabe, T. Kageyama, T. Kobayashi, K. Marutsuka, S. Mitsunobu, Y. Morita, K. Nakanishi, S. Ogasawara, T. Okada, M. Ono, H. Sakai, Y. Takeuchi, K. Watanabe, Ma. Yoshida, S.I. Yoshimoto, K. Yoshino
    KEK, Ibaraki, Japan
 
  SuperKEKB aims for high luminosity on the order of 1035 cm-2s-1 with high beam currents of 2.6 A for electron and 3.6 A for positron to search a new physics beyond the Standard Model in the B meson regime. In recent operations, we achieved new record of the luminosity of 4.7x1034 cm-2s-1 with 1.1 A for electron and 1.3 A for positron. The RF system that is basically reused from KEKB is operating stably in the high current operation owing to the measures against to large beam power and HOM power. To cope with the large beam power, it has been increased the number of klystrons that drive only one normal conducting cavity (ARES) and reinforced the input couplers of ARES. As a measure against HOM power, the additional HOM dampers have been installed to superconducting cavities. One-third of LLRF control systems have been replaced with newly developed digital system to improve accuracy and flexibility. New damper system for coupled bunch instability expected in high current has been installed to new digital system. In this report, operation status of RF system under the high current operation will be presented.  
slides icon Slides WEXAS0102 [8.011 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-WEXAS0102  
About • Received ※ 28 November 2022 — Accepted ※ 07 February 2023 — Issue date ※ 15 February 2023  
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