A high-frequency cavity with compensation capacitor and its working frequency adjustment method

Abstract

The invention belongs to the technical field of cyclotrons and in particular relates to a high frequency cavity with compensation capacitors and a method for adjusting the working frequency thereof. The high frequency cavity with the compensation capacitors comprises a high frequency cavity accelerating electrode plate, a trimmer and a pair of compensation capacitors, wherein the high frequency cavity accelerating electrode plate is arranged inside a high frequency cavity shell; the trimmer is arranged in the middle position of the tail inside the high frequency cavity shell; the distance between the high frequency cavity accelerating electrode plate and the trimmer is adjustable; the compensation capacitors are arranged at the tail inside the high frequency cavity shell and at the two sides of the trimmer; the compensation capacitors are used for adjusting the working frequency of the high frequency cavity. The high frequency cavity has a simple structure, is convenient to dismantle and install, is simple and rapid in working frequency adjustment, is low in cost and can satisfy the adjusting accuracy of the working frequency of the running high frequency cavity.

Description

technical field [0001] The invention belongs to the technical field of cyclotrons, and in particular relates to a high-frequency cavity with a compensation capacitor and a working frequency adjustment method thereof. Background technique [0002] A cyclotron is a device that makes use of a magnetic field and an electric field to make charged particles undergo cyclotron motion, and is repeatedly accelerated by a high-frequency electric field during the motion. It is an important instrument in high-energy physics. 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. [0003] Construction time must be considered during the construction of a medical proton therapy accelera...

AI Technical Summary

Problems solved by technology

Due to the complex structure of the edge of the high-frequency accelerating electrode, the edge needs to be processed many times to meet the final requirements, which often takes a long time

Another method is to increase the area of ​​the fine-tuning capacitor to about 5 times the original area, so that the adjustment ability of the fine-tuning capacitor to the operating frequency of the high-frequency cavity is increased from 0.4MHz to 2MHz. Although this method can quickly complete the high-frequency The frequency adjustment process of the cavity, but during the operation of the high-frequency cavity, because the frequency adjustment amount of the fine-tuning capacitor corresponding to the unit distance is too large, the compensation of the deformation caused by the heat generated by the fine-tuning capacitor is too rough, causing the problem that it is difficult to carry out precise control

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