Two electron cyclotron resonance (ECR) ion sources were manufactured for the accelerator facility at the Hyogo Ion Beam Medical Center. H2+, He2+, and C4+ were chosen as the accelerating ions because they have the highest charge to mass ratio among ion states which satisfy the required intensity and quality. The sources have the same structure as the 10 GHz ECR source at the Heavy Ion Medical Accelerator in Chiba except for a few improvements in the magnetic structure. Their performance was investigated at the Sumitomo Heavy Industries factory before shipment. The maximum intensity was 1500 μA for H2+, 1320 μA for He2+, and 580 μA for C4+ at the end of the ion source beam transport line. These are several times higher than required. Sufficient performance was also observed in the flatness and long-term stability of the pulsed beams. These test results satisfy the requirements for medical use.

The Japan Atomic Energy Research Institute has been proposing the Neutron Science Project (NSP). The joint project of the NSP and the JHF of KEK is under discussion. The new project makes use of the R&D results of the NSP and the JHF. The R&D activities of the proton accelerator at JAERI will be presented in this paper.The development work and characteristics measurements have been made for the low energy components of the linac; performance tests of a negative hydrogen ion source, development of an integrated type RFQ and high duty factor power tests of a DTL model tank. A superconducting linac is a main option for the high energy part of the linac. Vertical tests of a single cell superconducting cavity have been made. The maximum peak surface fields of 44 MV/m and 47 MV/m have been achieved for β=0.5 and 0.89 cavities, respectively. A 600 MHz IOT RF source has been manufactured and dummy load tests at 35 kW CW have been successfully conducted.