| 摘要 |
PROBLEM TO BE SOLVED: To permit a rotary gantry to be reduced in size and weight, and accurate rotation control of the rotary gantry and accurate irradiation on a target. SOLUTION: The electromagnet for controlling a charged particle beam guides a charged particle beam accelerated by an accelerator to a target by forming a deflecting magnetic field stored in the rotary gantry of an irradiation therapy instrument and varying the path of the charged particle beam, and a converging magnetic field controlling a diverging component receding from the center of the path of the charge particle beam, and has superconducting coils 41:42 whose shapes are set so as to simultaneously form the deflecting magnetic field and the converging magnetic field as a synthetic magnetic field and change the direction of the magnetic field along the path of the charged particle beam. COPYRIGHT: (C)2011,JPO&INPIT |
