The delivery system of hadron therapy at insititute of modern physics

The hadron therapy system at Institute of Modem Physics will provide carbon ion beams for clinical treatment of in-depth tumors. The beam delivery system, which is used to transfer the beam to irradiation fields, is critical for the heavy ion cancer clinical trials. The tumor is uniformly irradiated. Primarily accelerated by the cyclotron, the heavy ion beam pours into the cooler storage ring main (CSRm) for accumulation and acceleration. The ion beam is extracted by resonance, before the beam is transferred to the tumor through the transfer line. Based on the medical requirements and technical specifications to design and optimize the transfer line, a set of lens parameters is adopted to flexibly adjust the beam spot size. The feasibility of a scanning system is verified by simulating the beam scanning process. (authors)