Large-momentum-acceptance superconducting rotating frame for proton therapy

Abstract

The invention discloses a large-momentum-acceptance superconducting rotating frame for proton therapy. The superconducting rotating frame comprises an energy reducer component, a first deflection superconducting magnet component, a second deflection superconducting magnet component and a treatment head component with a pen-shaped beam scanning function; the first deflection superconducting magnetcomponent and the second deflection superconducting magnet component both comprise deflection magnets and focusing magnets, and are both of symmetrical structures; each deflection magnet is a combinedsuperconducting magnet with a dipolar field and an alternating-gradient quadrupole fields; and dispersion elimination is realized in the first deflection superconducting magnet component and the second deflection superconducting magnet component separately, and the maximum value of the dispersion function is suppressed by the strong focusing characteristic of the alternating gradient quadrupole field, so that the superconducting rotating frame has large momentum acceptance. Therefore, the weight and the size of the frame are obviously reduced, and the quench problem caused by rapid magnetic field change of a superconducting magnet is avoided.

Description

technical field [0001] The invention belongs to the technical field of proton therapy, and more specifically relates to a high-momentum acceptance superconducting rotating frame for proton therapy. Background technique [0002] Proton therapy is a precision radiation therapy method for cancer. Based on the proton Bragg peak dose distribution characteristics, dose control at different depths can be achieved by adjusting the energy of the proton beam. At the same time, the commonly used pencil beam scanning technology can be used to achieve transverse beam irradiation, so as to achieve accurate three-dimensional conformal radiotherapy for tumors and reduce the risk of radiation exposure. Damage to surrounding healthy tissue. [0003] The 180-degree or 360-degree rotating gantry is the core subsystem of proton therapy, which can implement multi-irradiation radiation therapy from different angles to the lesion according to the treatment plan. At present, the rotating frame bea...

AI Technical Summary

Problems solved by technology

The main technical problem faced by the superconducting scheme is that for the rapid change of energy in the process of proton therapy (the current level is to change the magnetic stiffness of the proton beam by 1% within 100ms), the corresponding superconducting magnetic field and coil current need to achieve the same change speed, Easy to cause quench and magnetic field instability

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