LASER PRODUCED IONS AS AN INJECTION BEAM FOR CANCER THERAPY FACILITY

Ion production from a solid target by a high-power short-pulse laser has been proposed to replace the injector linac for the synchrotron dedicated for cancer therapy in order to reduce the size of the facility. For the reduction of the energy spread of the laser-produced ions up to ±5 %, a scheme of phase rotation is to be utilized. A quarter wave length resonator with the resonant frequency of 79.3~82.7 MHz and its power amplifier of the maximum power of 30 kW are designed and fabricated. Ion production from the solid target has also been studied and experimental results suggest the ion production from under dense plasma for the case with the presence of prepulse.