Endurance test of the J-PARC-made RF antenna coil for H ion source

Shibata, Takanori*; Shinto, Katsuhiro   ; Nammo, Kesao*; Okoshi, Kiyonori ; Kawai, Isao*; Ikegami, Kiyoshi*; Oguri, Hidetomo  

In the recent J-PARC user operation from 8th November 2023 to 1st July 2024, a single J-PARC radio frequency (RF) hydrogen negative ion (H ion) source generated an H ion beam with its continuous operation of 4,962 hours (approximately 6.8 months). The extracted beam current for the user operation is 60 mA under input RF power to the ion source of 25 - 30 kW. The key component of the RF ion source is the internal antenna coil. A new J-PARC-made antenna coil is manufactured to enable a stable supply of the ion source components for the J-PARC operation. Endurance tests and soundness evaluations were performed for several antenna samples at the offline test stand to judge the availability of the prototype.