Proton synchrotron composed of combined magnets

Abstract

The invention relates to a proton synchrotron composed of combined magnets. The proton synchrotron comprises four deflecting combined magnets connected by four straight sections to form a ring structure. The deflecting combined magnets are combined magnets having the functions of a deflecting dipole magnet and horizontal focusing and horizontal defocusing quadrupole magnets. The straight sectionsinclude quadrupole-hexapole combined magnets having a horizontal focusing or horizontal defocusing function. Quadrupole-dipole and quadrupole-hexapole combined magnets are used for the first time on amedical proton accelerator, a full-loop envelope function is controlled to a small level, the acceptance of the synchrotron and the number of proton storage are effectively improved, the proton utilization rate and the duty cycle are increased and the treatment time is shortened. In addition, the use of the combined magnets and four blocks of bent iron reduces the gap between the magnet elementsand the same, and the functions of the medical accelerator are realized with as few elements as possible, so that the space occupied by the synchrotron is reduced and the equipment cost and treatmentcost are lowered.

Description

technical field [0001] The invention relates to the field of synchrotrons for tumor treatment, in particular to a proton synchrotron composed of combined magnets. Background technique [0002] The excellent Bragg peak characteristics of proton in the depth direction make it one of the most advanced methods in tumor treatment. At present, there are more and more proton therapy devices and treatment centers in the world. The proton cancer treatment accelerators currently in operation and under construction are mainly cyclotrons and synchrotrons. [0003] The cyclotron can provide a stable continuous beam, and its beam cutting and opening speed is very fast, which can meet the requirements of respiratory gating. However, the energy change of the cyclotron depends on the mechanical device placed on the high-energy line—the energy reducer, which reduces the energy of the beam by scattering; its advantage is that the energy can be adjusted quickly, and the energy change speed can...

AI Technical Summary

Problems solved by technology

However, the design of this kind of accelerator is relatively complicated, using 8 deflecting dipole magnets and 12 focusing and defocusing quadrupole magnets, the increase of components means the decline of reliability; The gap between them becomes a waste; the third is that the magnetic field strength is very high, close to saturation, and the excitation efficiency is not high, resulting in high energy consumption. The magnet is a high-power device, and a lot of energy is wasted in the cycle of energy-up and down-energy

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