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Report No.

Operation status of the J-PARC ion source

Oguri, Hidetomo  ; Okoshi, Kiyonori ; Ikegami, Kiyoshi*; Yamazaki, Saishun; Takagi, Akira*; Koizumi, Isao; Ueno, Akira  

A cesium-free negative hydrogen ion source driven with a LaB6 filament is being operated for J-PARC. The ion source has been providing a beam for approximately eight years without any serious troubles. The source plasma is produced by an arc discharge and confined by a multi-cusp magnetic field produced by permanent magnets surrounding the chamber wall. The ion source has been operated in two different modes such as low current mode of 19 mA and high current mode of 32 mA. Continuous operation for about six weeks and about one week was achieved in low and high current mode, respectively. After the operation, we replace the filament by a brand-new one to prevent the filament from failing during the operation. The required time for the replacement including the filament degassing process, the vacuuming and the conditioning operation is about 15 hours.



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