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Present status of the J-PARC cesiated rf-driven H$$^-$$ ion source

J-PARCセシウム添加型高周波負水素イオン源の現状

神藤 勝啓; 大越 清紀; 池上 清*; 高木 昭*; 柴田 崇統*; 南茂 今朝雄*; 滑川 裕矢*; 上野 彰; 小栗 英知

Shinto, Katsuhiro; Okoshi, Kiyonori; Ikegami, Kiyoshi*; Takagi, Akira*; Shibata, Takanori*; Nammo, Kesao*; Namekawa, Yuya*; Ueno, Akira; Oguri, Hidetomo

Operation of a cesiated RF-driven negative hydrogen ion source was initiated in September 2014 in response to the requirements of beam current upgrade in J-PARC linac. Delivery of the required beam current from the ion source to the J-PARC accelerators has been successfully performed. In 2016-2017 campaign, continuous operation of the ion source for approximately 1,840 hours (RUN#75 from April to July 2017) was achieved with beam current, macro pulse width and repetition of 45 mA, 500 $$mu$$s and 25 Hz, respectively. We present the operation status of the ion source and a high current H$$^-$$ beam with 70 mA extracted from the ion source for the further high-power upgrade in J-PARC accelerators.

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