Compact injector with alternating phase focusing-interdigital H-mode linacand superconducting electron cyclotron resonance ion source for heavy ion cancer therapy

We have researched a compact medical accelerator with low investment and ru nning cost for the popularization of heavy ion cancer therapy. As the first step, the compact injector system has been investigated for a Heavy Ion Me dical Accelerator in Chiba at National Institute of Radiological Sciences. The proposed new injector system consists of a 6 MeV/u interdigital H-mode (IH) linac of 3.1 m long and a 18 GHz superconducting electron cyclotron re sonance (ECR) (SC-ECR) ion source. The IH linac with high power efficiency is appropriate to a medical and industrial injector system. Its beam trajec tory was simulated and a prototype has been constructed. The SC-ECR ion sou rce has been designed to realize lightweight and low power consumption and the mirror field distribution was estimated. (C) 2000 American Institute of Physics. [S0034-6748(00)53902-1].