Superconductive electromagnet device and charged particle beam therapeutic device

Abstract

The invention provides a superconductive electromagnet device which can reduce superconducting coil material usage amount, and a charged particle beam therapeutic device. A superconductive electromagnet (41) includes a first coil portion (42a) that is arranged close to a gap of a yoke (43), a second coil portion (42b) that is arranged farther from the gap than the first coil portion (42a), and first and second power sources (51,52) that supply currents to the first and second coil portions (42a, 42b0, respectively. This configuration can change respective values of the currents flowing in the first and second coil portions (2a,42b). The value of the current flowing in the first coil portion (42a) is set to be greater than the value of the current flowing in the second coil portion (42b), thereby increasing distribution of the value of the current flowing in the first coil portion (42a) and decreasing distribution of the current flowing in the second coil portion (42b). When a magnetomotive force generated by the superconductive coil (42) is applied in the same manner, a cross-sectional area of the second coil portion (42b) is reduced.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2014-107807 filed on May 26, 2014. The entire contents of this Japanese application are incorporated herein by reference. [0002] The invention relates to a superconducting magnet device and a charged particle beam therapy device. Background technique [0003] For example, in a charged particle beam therapy apparatus for treating cancer patients by irradiating charged particle beams, there is known an electromagnet that deflects a charged particle beam using a superconducting magnet as a deflection electromagnet that forms a deflection magnetic field around the track of the charged particle beam. (For example, refer to Patent Document 1). [0004] Patent Document 1: Japanese Patent Laid-Open No. 2011-072717 [0005] The maximum current value that can be passed to the superconducting coil of the superconducting magnet differs depending on the strength of the magnetic field in ...

AI Technical Summary

Problems solved by technology

Specifically, due to the influence of the leakage flux from the gap of the iron core, the closer the gap is, the higher the magnetic flux density is, and the maximum current value that can be energized to the superconducting coil is limited.

Therefore, in the superconducting coil, the maximum current value that can be energized is sufficient at the part disposed on the side away from the gap, resulting in wasteful

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