Operation status of the J-PARC H ion source

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

In September 2014, a cesiated RF-driven negative hydrogen ion (H) source was initiated to operate at the Japan Proton Accelerator Research Complex (J-PARC). The extracted H beam current and the continuous operation time of the ion source have been improved upon their own records. In the RUN#79 (from April to July 2018), the ion source delivered the H beam current of 47 mA to the post-accelerators for 2,201 hours continuously. In October 2018, the beam current from the ion source was increased to 60 mA in order to inject the beam current of 50 mA into the 3 GeV synchrotron. In the RUN#80 (from October to December 2018), the continuous operation time of 1,791 hours was achieved. For the past year, we had the antenna failures twice during the operation, and needed to replace to a spare ion source. We have been developed the J-PARC-made antenna by using a test-stand. Recent experiment result showed the continuous operation time of 2,083 hours was achieved with the J-PARC-made antenna.