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

Ueno, Akira  

On 2018, the stable operation of the J-PARC cesiated RF-driven H ion source (IS) with a 62 keV 100 mA beam, whose emittances were suitable for the radio-frequency quadrupole LINAC (RFQ), 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 and the possibility of the space charge limited beam intensity pulling up by increasing the extraction and acceleration voltages were proven. The stable operation results with a 65 keV 110 mA beam are presented. Since the 102.5 mA of the beam was measured inside the emittances used for the RFQ design, the RFQ with a 97.6% acceleration efficiency could accelerate a 100 mA beam.