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Impedance measurement of an antenna with hydrogen plasma driven by 13.56 MHz-rf for J-PARC H$$^{-}$$ ion source

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

A Cs free H$$^{-}$$ ion source driven with a LaB$$_{6}$$ filament is being operated at the J-PARC. Although it satisfies the J-PARC first stage requirements of an H$$^{-}$$ ion beam current of 30 mA and a life-time of 500 hours, it was proven that the current was not increased by seeding Cs. In order to satisfy the second stage requirements of an H$$^{-}$$ ion beam current of 50 mA and a life-time of 2000 hours, the development of a 13.56 MHz-rf-driven H$$^{-}$$ ion source was started by using an antenna developed at the SNS. As the first step, the impedance of an antenna with hydrogen plasma was measured. For an rf-power of 1.25 kW or 7.45 kW, it was measured as 11.82+80.22j $$Omega$$ or 21.16+58.24j $$Omega$$, respectively, which has a high real-part and positive rf-power dependence unexpectedly. By using the measured impedance, the circuit to produce rf-plasma in the plasma chamber on the -50kV potential with a 13.56 MHz-rf on the ground potential was designed by LTSpice IV.

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