A radio frequency wave resonant heating antenna

Abstract

The invention discloses a low-frequency wave resonant heating antenna, which includes a supporting box of the antenna, a Faraday shielding plate, a radiation current strip and a resonance unit, and the radiation current strip is placed around the supporting box of the antenna and the Faraday shielding plate Inside the formed cavity, they are arranged side by side at equal intervals, and the end of the bottom surface is fixedly connected to the inner surface of the bottom of the supporting box; the resonant unit of the antenna includes a dielectric substrate, a periodic high-impedance surface structure and a grounded metal rod, and the resonant unit It is used to improve the resonant frequency and electromagnetic wave power spectrum of the antenna. The resonant unit is located inside the antenna cavity. The dielectric substrate is closely attached to the back of the radiation current strip. The high-impedance surface structure is embedded in the dielectric substrate, and the metal rod is connected to the back of the supporting box. The inner surface is fixedly connected for grounding. The antenna utilizes circuit resonance to reduce the energy reflection at the port of the ion cyclone heating system in the magnetic confinement nuclear fusion device, and improves the coupling degree of the antenna radiation power and the plasma load.

Description

technical field [0001] The invention relates to the field of radio-frequency wave heating of magnetically confined plasma used in magnetically confined nuclear fusion devices, in particular to a low-reflection, high-coupling radio-frequency wave resonant heating antenna. Background technique [0002] Ion cyclotron heating (ICRF) is an important way of plasma heating in magnetic confinement fusion devices. The radio frequency waves generated by the system can directly and effectively heat the ions in the plasma. All large-scale magnetic confinement nuclear fusion devices at home and abroad are equipped with ion cyclotron heating systems, but the problems of excessive reflection at the ICRF antenna port and low radiation coupling efficiency of ion cyclotron heating are very prominent. The ICRF antenna of the magnetically confined tokamak EAST device in my country has a serious mismatch without the support of an additional impedance matching system, the return loss of the anten...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of large port return loss and low power coupling in existing equipment, the present invention provides a radio frequency wave The resonant heating antenna has the characteristics of low reflection and high coupling. Under the limited power input, the return loss of the port is reduced, and the power output and coupling are increased.

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