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MA cavities for J-PARC with controlled Q-value by external inductor

J-PARC RCS MA空胴の外部インダクタによるQ値の調整

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

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

The original J-PARC RCS cavity design used cut-cores to control the Q-value. Adjusting the distance between the C-shaped core parts the optimum Q=2 is reached. Because of problems related to the cut-core surfaces, the "hybrid cavity" was introduced, using tanks with uncut cores (Q=0.6) in parallel to tanks with cut cores with a wider gap (Q=4), resulting in total Q=2. This was successfully tested. The manufacturing procedure for cut-cores involves more steps than for uncut cores. To reduce long-term operation risks, the RCS cavities are loaded with uncut cores for day-1 operation. With uncut cores (Q=0.6) the maximum beam power is limited. Therefore we introduce a parallel inductor, placed in the push-pull tube amplifier driving the cavity, to adjust the Q-value to 2. Parallel vacuum capacitors shift the resonance to 1.7 MHz. Each of the 10 RCS cavity systems necessary for day-1 is tested for at least 300 hours to detect initial problems before installation into RCS. We report the results of cavity performance tests with external inductor, which simulate 25 Hz operation and the optimization of the combined system of cavity and amplifier.

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