Superconducting cyclotron superconducting magnet excitation method

Abstract

The invention discloses an excitation method of a superconducting magnet for a superconducting cyclotron, belongs to the field of particle cyclotron acceleration and solves the problem of quenching easily caused in a primary excitation process. Firstly, a corresponding excitation current is calculated according to magnetic field intensity. Then, excitation is operated to the superconducting magnetfor many times, and the input current of each excitation is 4% to 5%, 8.5% to 9.5%, 20% to 25%, 40% to 50% and 100% of the excitation current in sequence. The excitation method of the superconductingmagnet for the superconducting cyclotron avoids the problem of the quenching easily in the primary excitation to required magnetic field intensity through progressive excitation. The limit field strength of the superconducting magnet can be obtained through an exploratory excitation method and through the limit field strength, the magnetic field intensity can be guided to reach the primary excitation without exceeding the limit field strength in subsequent excitation. Through the excitation method of the superconducting magnet for the superconducting cyclotron, the risk of quench loss in theprogressive excitation is small. The problem of the quenching can be completely avoided according to the excitation method of the superconducting magnet for the superconducting cyclotron to carry outthe excitation, so that the amount of liquid helium produced and consumed is greatly saved because of quenching.

Description

technical field [0001] The invention relates to the field of superconducting cyclotron, more specifically, it relates to a superconducting cyclotron superconducting magnet excitation method. Background technique [0002] A cyclotron is a kind of particle accelerator, which uses a magnetic field and an electric field to make charged particles perform cyclotron motion, and is repeatedly accelerated by a high-frequency electric field during the motion. The superconducting cyclotron is the core equipment of the current medical proton therapy accelerator. Medical proton therapy accelerators can treat tumors with protons and heavy ion rays in the microscopic world. It is the most advanced radiation therapy technology in the world today, and only a few developed countries have mastered and applied this technology. The development of superconducting cyclotron is being carried out in China. [0003] The magnetic field of the superconducting cyclotron is mainly provided by the superc...

AI Technical Summary

Problems solved by technology

When the excitation current increases too fast, the critical field strength decreases, and the required magnetic field strength is likely to exceed the critical magnetic field to cause a quench. During the quench process, the coil will heat up, resulting in the consumption of liquid helium vaporization, and even burning the superconducting coil.

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