Dual-drive four-resonant-cavity high-frequency D circuit

Abstract

The invention relates to a dual-drive four-resonant-cavity high-frequency D circuit, and the high-frequency D circuit comprises three parts: a dual high-frequency emitter system, a four high-frequency resonant cavity system, and a single low-level system. Two 100kW high-frequency emitters drive two groups of cavities I and R. Each group of high-frequency cavities comprise two double acceleration gap resonance D boxes which are connected with each other in a central region through a conductor. The low-level system comprises a cavity resonance loop, an I-cavity voltage amplitude control loop, an R-cavity voltage balancing loop, a remote control circuit and a fine tuning capacitor control loop. The D circuit provided by the invention can improve the acceleration phase precision of a high-frequency system of a medical superconductive circular accelerator, can effectively avoid a problem of upper and lower frequency mixing caused by the mutual coupling capacitance of two groups of cavities, is easier to stable the acceleration voltages and resonance frequencies of the two groups of cavities, and can effectively improve the reliability of speeding-up ions of a high-frequency system.

Description

technical field [0001] The invention belongs to the overall design of the high-frequency system of a medical superconducting cyclotron, and in particular relates to a high-frequency D circuit with double drives and four resonant cavities. Background technique [0002] A cyclotron is a device that uses a magnetic field to make charged particles perform cyclotron motion, and is repeatedly accelerated by a high-frequency alternating electric field to increase the energy of the particles. Its basic components include a magnet system, a high-frequency system and a vacuum system. The role of the high frequency system is to provide energy gain to the accelerated ions. The superconducting cyclotron has been a research hotspot in the field of medical accelerators in the past ten years. It uses superconducting coils to generate a magnetic field, so the volume of the magnet system is smaller than that of a normal temperature cyclotron, and the entire accelerator has a compact structure...

AI Technical Summary

Problems solved by technology

[0004] There are two direct limitations of this method: ① When the D voltage amplitude is balanced, the acceleration phase cannot be guaranteed

②Unable to ensure that the system works at the required lower frequency

Finally, in this scheme, once an abnormality such as high-voltage breakdown and ignition occurs in a certain cavity, all four cavities will be affected, and the reliability of the beam delivery will be low.

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