First operation of new inductive accelerating module at JAERI

A new electron induction acceleration unit is completed and operated at JAERI. Several new technologies are involved therein: (1)New Fe-based nanocryostal-line soft magnetic material “Finemet” is used in foil. Its higher saturation flux density and lower power loss than the other Fe based amorphous alloys improves the performance. (2) The waveform of the accelerating voltage can be kept constant within ±1 % during the pulse, and moreover the ramp of the pulse can be varied in the range of +/− 200 kV/130ns. (3) The accelerating units are divided into two parts: One is for the beam generation and the other for the post acceleration. The latter is fabricated so that the driving circuit be separated from the acceleration column. A final beam of 2.5 MeV (variable for 1.3−2.5 MeV), 3 kA and 160 ns flat top is expected. The results of a cold test of the system combined with the power supply and acceleration cell are given.