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Development of a Cs-seeded RF-driven H$$^{-}$$ ion source for the J-PARC

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

A cesium (Cs) seeded RF-driven H$$^{-}$$ ion source using an internal-antenna developed at the SNS (Spallation Neutron Source) is under development for the J-PARC (Japan Proton Accelerator Research Complex). The axial magnetic field optimization by using an axial magnetic field compensation (AMFC) coil significantly enhances the H$$^{-}$$ ion beam by typically 10%. An H$$^{-}$$ ion beam with a flat top duty factor of 2.5% (1 ms $$times$$ 25 Hz) of 77 mA, whose about 90% (corresponding to about 70 mA) of emittance of each direction is within 1.5 $$pi$$mm$$cdot$$mrad, is successfully extracted. During a demonstration operation over 100-hours, an H$$^{-}$$ ion beam over 66 mA was successfully produced with a relatively low RF power of about 40 kW by seeding Cs for 4-minutes a day.

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