Superconducting electromagnet and particle beam therapy system and operation method of superconducting electromagnet

摘要

The reference magnetic field individually set for each patient or affected part is gradually changed between patients or affected part, that is, the basic magnetic field component having a small temporal change rate of the magnetic field is excited by the outer peripheral side superconducting coil 6 and its power supply 7. Then, a magnetic field component having a large time change rate of changing the magnetic field at high speed in the vicinity of the reference magnetic field necessary for irradiating each layer in one patient or one diseased part is divided from the basic magnetic field component, and independent of the coil 6 The inner peripheral side superconducting coil 8 and the power supply 9 thereof excite a magnetic field component having a large time change rate. As a result, the quench risk can be suppressed as compared with the prior art, and it is possible to provide a superconducting electromagnet capable of changing the magnetic field at high speed and a particle beam therapy system using the superconducting electromagnet.