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Status of J-PARC ring RF systems

J-PARC ring RFシステムの現状

Schnase, A.; 野村 昌弘; 田村 文彦 ; 山本 昌亘; 芳賀 浩一; 長谷川 豪志; 吉井 正人*; 大森 千広*; 原 圭吾*; 戸田 信*; 高木 昭*; 穴見 昌三*; 絵面 栄二*

Schnase, A.; Nomura, Masahiro; Tamura, Fumihiko; Yamamoto, Masanobu; Haga, Koichi; Hasegawa, Katsushi; Yoshii, Masahito*; Omori, Chihiro*; Hara, Keigo*; Toda, Makoto*; Takagi, Akira*; Anami, Shozo*; Ezura, Eiji*

We present the Status of the J-PARC RF systems of the Rapid Cycling Synchrotron (RCS) and the 50 GeV Main-ring (MR). The RCS RF systems are prepared for beam commissioning scheduled in September 2007. The 10 cavities, amplifiers and power supplies are installed in the RCS tunnel. The cavities are loaded with improved uncut cores. The parallel inductor for Q=2 was successfully tested and installed in all systems. The long-term performance and reliability of each of the 180 cores was checked for at least 300 hours. One set of cores performed a 1000-hour power test. We operate the cavities in the tunnel together with the LLRF system to check the interoperability and prepare for 25 Hz RCS operation. Some issue related to noise and grounding was solved. Unwanted resonances of the tube amplifier in the RCS frequency range were analyzed and removed. For the MR RF systems, we have decided to employ the diamond polishing technique for cut-core production. The long run high power tests with cut-core loaded cavities are ongoing. We prepare for installation start to MR in September 2007.

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