120 mA operation of J-PARC cesiated RF-driven H ion source

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

On 2020, the stable operation of the J-PARC cesiated RF-driven H ion source (IS) with a 65 keV 110 mA beam, whose emittances were suitable for the radio-frequency quadrupole LINAC, was reported. In the J-PARC IS operation, the stable plasma production with a 50 kW 2 MHz RF power for more than 3 months, an RF power efficiency higher than 2.6 mA/kW and the possibility of the space charge limited beam intensity pulling up by increasing the extraction and acceleration voltages (V and V) were proven. The stable operation results with a 69.9 keV 120 mA beam realized by increasing the withstand voltage around the 2 MHz RF matching circuit are presented. The 107.8 mA of the beam was measured inside the emittances used for the RFQ design.