Status of the KEK injector linac

In April 1977, the KEK proton synchrotron started to run for experiments in high energy physics. Typical beam intensites of the injector are currently: 620 mA from the preinjector column 250-mA beam into the linac and 130 mA at the linac exit at 20 MeV. The rf system was modified to feed more power into the buncher and the debuncher. Rf windows, isolators, control system of the Cockcroft generator and an optical fiber data transfer system have been developed or improved. The linac beam of 200 mA has been achieved by removing grids from the buncher and lowering the column pressure of the preinjector. Although beam loading is not completely compensated in the accelerating field of the tank, the momentum spectrum of the beam is not seriously affected by the beam loading