THE R&D STATUS ON THE FRONT END OF THE HIGH INTENSITY PROTON ACCELERATOR IN JAERI

The R&D for the high intensity and high duty factor proton linear accelerator has been carried out. A hydrogen ion source, an RFQ and an RF power source have been developed and 2 MeV proton beam tests have been conducted to study the front end of the accelerator. In the beam tests, an accelerated current of 70 mA with a duty factor of 7- 10 % was achieved. To demonstrate the high duty factor operation of the DTL, a hot test model was fabricated and high power tests with a duty factor of 20 % have been carried out. In this report, present status of the R&D activities is described