2015•Proceedings of the 2nd International Symposium on Science at J-PARC — Unlocking the Mysteries of Life, Matter and the Universe —Requires access
Improvements of Low Level RF Control Systems for J-PARC LINAC 400-MeV Upgrade
Zhigao Fang, K. Futatsukawa, Y. Fukui, T. Kobayashi, Shinichiro Michizono, Fumiaki Sato, Shinichi Shinozaki, E. Chishiro
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Abstract
The low level RF (LLRF) control systems have been successfully improved for the J-PARC LINAC upgrade. After the installation of 972-MHz high- acceleration section behind the 324-MHz low- section beginning in the summer of 2013, the proton beam was successfully accelerated to 400 MeV in January 2014. Many improvements in the LLRF control systems have been carried out to facilitate the operation of the J-PARC LINAC at 400 MeV. The reference 12-MHz signal delay settings for the feedback control systems have been optimized using 12-MHz delay modules. The stability performances of the 972-MHz RF&CLK (Clock) and Mixer&IQ (Mixer & IQ-modulator) boards have been improved using temperature-compensation techniques. By improving the hardware of the feedback control systems, very good stability of the RF systems has been achieved.