Multi-element array radio frequency wave heating antenna with low radio frequency sheath and high flexibility

Abstract

The invention discloses a multi-element array radio frequency heating antenna with a low radio frequency sheath and high flexibility, which is characterized in that one end of an outer conductor is fixedly connected with the back of an antenna supporting box body through a flange, the front of the antenna supporting box body is fixedly connected with the back of a Faraday shielding cavity, a current band is located at the inner side of the Faraday shielding cavity, one end of the current band is fixed on the inner wall of the Faraday shielding cavity, an inner conductor sequentially penetrates through the outer conductor, the antenna supporting box body and the Faraday shielding cavity and is connected with the other end of the current band. The ion cyclotron heating antenna mainly rotates along the circumferential field component of the magnetic field of a Tokamak device, the radio frequency sheath potential at two ends of the antenna is reduced, and the generation of impurities is reduced. Comb-shaped slits are formed on Faraday shielding partition plates, field components of excited magnetic sound waves are allowed to pass through without being influenced, and insulating ceramic with a high dielectric constant is designed between the Faraday shields to serve as a limiter, thereby avoiding the formation of a channel between plasmas and current bands, reducing the mutual coupling between the current bands, and improving the coupling power.

Description

technical field [0001] The invention relates to the technical field of magnetic confinement nuclear fusion plasma heating, in particular to a low radio frequency sheath and high flexibility multi-element array radio frequency wave heating antenna. Background technique [0002] Ion cyclotron resonance heating (ICRH) is one of the very effective auxiliary heating means in the tokamak device, which can directly and effectively heat the ions in the plasma. Compared with low confounding waves and electron cyclotron resonance heating, the problem of improving the coupling efficiency of the antenna is very prominent due to the low operating frequency of the ion cyclotron frequency band. It can be seen from the absorption performance of the plasma on the radio frequency wave in the tokamak, k / / The smaller spectral component double-pass absorption efficiency is very low, it will reflect back and forth multiple times in the device, it will form a coaxial mode on the plasma surfac...

AI Technical Summary

Problems solved by technology

It can be seen from the absorption performance of the plasma on the radio frequency wave in the tokamak, k / / The smaller spectral component double-pass absorption efficiency is very low, it will reflect back and forth multiple times in the device, it will form a coaxial mode on the plasma surface, which will lead to a significant increase in the plasma boundary temperature, but at the same time the antenna attachment The interaction between the plasma and the antenna components is intensified, and the impurity concentration increases, especially at the position where the radio frequency potential at both ends of the antenna is high, the impurity concentration is higher, the radiation loss is enhanced, and the coupling performance is also poor, which eventually leads to a decrease in the heating effect

In addition, currently existing magnetic confinement nuclear fusion devices in the world, due to space requirements, antenna assembly brings great difficulties. How to flexibly accommodate assembly requirements and take into account the increase in coupling power is currently a common practice both at home and abroad. a difficulty

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