A current compensation device for reducing the radio frequency sheath of the heating antenna

Abstract

The invention discloses a current compensation device for reducing the radio frequency sheath of a heating antenna, which comprises a supporting box, the supporting box includes a grounding backplane and a window, the window includes an end bottom plate and side baffles, and the upper and lower ends of the grounding backplane are respectively provided with The end bottom plate and the left and right ends of the grounding back plate are respectively provided with side baffles, and the middle position of the two side baffles is provided with a polar partition. is a parallelogram of θ, the inclination angle θ and the included angle θ between the total magnetic field of the tokmak and the ring direction are the same. When high antenna power is fed in, the present invention eliminates the high-strength ring on the surface by insulating the bottom plate of the supporting box on the one hand. On the other hand, the partial insulation of the pole-toward partition to block the circular current flowing through the Faraday shield can effectively weaken the parallel current imaginary part that forms the radio-frequency sheath potential, so that the peak value of the radio-frequency sheath potential during antenna operation is greatly reduce.

Description

technical field [0001] The invention relates to the technical field of magnetic confinement nuclear fusion Tokamak auxiliary heating equipment, in particular to a current compensation device for reducing the radio frequency sheath of a heating antenna. Background technique [0002] The tokamak device is an important device for the current magnetic confinement fusion research and the future development of fusion energy. Ion cyclotron resonance heating (ICRH) and current drive (CD) are important means for the tokamak device to obtain a steady state and high-parameter plasma. All large-scale magnetic confinement nuclear fusion devices at home and abroad are equipped with ion cyclotron heating systems. In future fusion reactors, the heating power of ion cyclotron heating antennas will be as high as tens of megawatts (≥20MW). However, the RF sheath driven by the ion cyclotron wave will lead to a strong interaction between the plasma and the boundary material, causing a series of ...

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Problems solved by technology

In addition, the ions are accelerated under the action of the radio frequency electric field and collide with the material, causing the energy to be transferred from the radio frequency field to the surface of the material, resulting in parasitic power loss (sheath power loss), which is one of the main factors leading to the power loss of the radio frequency wave at the boundary

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