In the recent J-PARC user operation from Nov. 10th, 2022 to June 22nd, 2023, continuous operation of 4,412 hours with hydrogen negative ion (H− ion) beam current up to 60 mA was achieved by J-PARC radio frequency (RF) H− ion source. This was also the first time to supply H− ion beam to the Linac in the yearly J-PARC user operation term by a single ion source (w/o ion source exchange). To satisfy the requirements of the further upgrade in J-PARC, a soundness evaluation of the present ion source components has been performed. Furthermore, the RF ion source with a newly manufactured RF antenna coil has been under development.
