High-precision magnetic field inclination angle measuring system applied to magnetic confinement fusion device

Abstract

The invention belongs to a magnetic confinement plasma diagnostic device, and particularly relates to a high-precision magnetic field inclination angle measuring system applied to a magnetic confinement fusion device. The high-precision magnetic field inclination angle measuring system comprises a neutral beam injection system which is installed in a fusion plasma. The external part of the fusion plasma is provided with a front-end optical lens which is connected with an optical modulation system. The optical modulation system is connected with gratings via optical fibers. The gratings are opposite to optical fiber arrays and a photoelectric conversion system. The optical fiber arrays and the photoelectric conversion system are connected with a phase-locked amplifier. Meanwhile, the optical modulation system is connected with the phase-locked amplifier so as to provide reference signals to the phase-locked amplifier. The phase-locked amplifier is connected with a data acquisition and control computer. The advantages of the high-precision magnetic field inclination angle measuring system are that reliability is great and measuring precision is quite high so that the high-precision magnetic field inclination angle measuring system can be applied to measurement of a plasma magnetic field deflection angle under the weak stark effect and can also be applied to high-precision and high-speed measurement of other linearly polarized light polarization direction.

Description

technical field [0001] The invention belongs to a magnetically confined plasma diagnosis device, and in particular relates to a system for measuring the magnetic field inclination angle through modulation, spectroscopic detection and demodulation based on an optical elastic modulator, a grating, an optical fiber array, a photoelectric conversion and a lock-in amplifier. Background technique [0002] In the research of controlled nuclear fusion experiments, the magnetic confinement device used to confine the plasma is mainly a tokamak (or stellarator) device. Due to the drift of the plasma, it is impossible to achieve the confinement of charged particles solely relying on the longitudinal field; therefore, a poloidal magnetic field must be introduced to make the total field form a helical structure. In this way, the drift direction of the particles in the plasma will change with time, so that the total drift cancels each other out, so that the particles are better restrained ...

AI Technical Summary

Problems solved by technology

However, when the magnetic field strength is low or the neutral beam energy is small, the dynamic Stark effect is very weak, and the Stark energy split of the beam emission spectrum is very small, and it is difficult to use a filter for the mutually orthogonal polarization components in the spectrum. differentiated, resulting in very low precision measurements

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