Polarized electron cyclotron emission (ECE) diagnosis system for measuring plasma current distribution

Abstract

The present invention belongs to the nuclear fusion plasma diagnosis field, in particular relates to a polarized ECE diagnosis system for measuring the plasma current distribution and the safety factor distribution. The system is composed of a frequency sweep source, a signal generator, a frequency multiplier, a mixer, an isolator, a polarized antenna system, an intermediate frequency system, a demodulation system, a video amplification system, a data acquisition and analysis system and the like. By measuring a polarized distribution ratio of the ECE, a pitch angle of the magnetic field distribution, the plasma current distribution and the safety factor q distribution are obtained. According to the present invention, by utilizing the basic properties of an X mold and an O mold of an ECE wave and by two antenna channels, the intensity ratio of the ECE waves of different angles is measured, and the pitch angle of the magnetic field distribution is obtained, and further the current distribution and the safety factor distribution are obtained. The measurement of the system is not influenced by the external conditions, such as the plasma heating, etc., to be the passive measurement, so that the data of the current distribution and the safety factor distribution can be obtained at any time.

Description

technical field [0001] The invention belongs to the field of nuclear fusion plasma diagnosis, in particular to a polarized electron cyclotron emission (ECE) diagnosis system for measuring plasma current distribution and safety factor distribution, which has high time and space resolution, low cost, fixed Good domain and other advantages. Background technique [0002] The poloidal magnetic field of the tokamak plasma is generated by the plasma current, and the poloidal magnetic field or safety factor q=rB Φ / RB θ The distribution of is a very important parameter in the study of plasma confinement, which is of great significance to the analysis of plasma transport, formation of magnetic islands, magnetic fluid instability, sawtooth collapse, and plasma radial electric field distribution. In recent years, in order to realize the steady-state operation of high-constraint plasma, a variety of advanced tokamak operation schemes have been proposed, such as making the plasma cente...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a polarized ECE diagnostic system for measuring plasma current distribution, which can solve the problem of the complexity of the plasma current distribution measurement system such as the dynamic Stark effect and far-infrared polarization interference diagnostic system, the system volume is huge, and the price Expensive, difficult to maintain, etc.

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