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Report No.
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Operation status of the J-PARC negative hydrogen ion source

Oguri, Hidetomo  ; Ikegami, Kiyoshi*; Okoshi, Kiyonori ; Namekawa, Yuya; Ueno, Akira  

A cesium-free H$$^{-}$$ ion source driven with a LaB$$_{6}$$ filament is being operated for J-PARC for about 4 years. Although the ion source can produce the H$$^{-}$$ ion current of 36 mA, the maximum current is restricted to 16 mA for the stable operation of the RFQ linac which has serious discharge problem from September 2008. The beam run is performed during 1 month cycle, which consisted of a 4-5 weeks beam run and a few days down-period interval. At the recent beam run, approximately 700 h continuous operation was achieved, which is satisfied with the requirement of the ion source lifetime for the J-PARC first stage. At every runs, the beam interruption time due to the ion source failure is a few hours, which correspond to the ion source availability of 99%. The R&D work is being performed in parallel with the operation in order to enhance the further beam current by using an ion source test stand.

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