Proton synchrotron employing combined magnets

Abstract

The invention relates to a proton synchrotron employing combined magnets. The proton synchrotron comprises eight deflecting combined magnets forming an annular structure by connection of eight straight segments or six deflecting combined magnets and two deflecting two-pole magnets that form an annular structure by connection of eight straight segments. The deflecting combined magnets are two-poleand four-pole combined magnets having functions of the two-pole magnet and horizontal focusing and horizontal defocusing type four-pole magnets. The straight segments include four-pole six-pole combination magnets having horizontal focusing or horizontal defocusing functions. According to the invention, because the two-pole and four-pole combined magnets and the two-pole and four-pole combined magnets are employed by the medical proton synchrotron for the first time, the full-loop envelope function is controlled to be at a small level and the strong focusing structure is kept; the acceptance of the synchrotron is enhanced and the proton storage number is increased; the error influence is reduced; the proton utilization and duty cycle are increased; and the treatment time is reduced.

Description

technical field [0001] The invention relates to the field of synchronous accelerators for tumor treatment, in particular to a proton synchronous accelerator using 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 energ...

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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