Three-step composite Mach probe for plasma diagnosis

Abstract

The invention provides a three-step composite Mach probe for plasma diagnosis, which is applied to a Tokamak magnetic confinement nuclear fusion experimental device and comprises a plurality of double probe pairs, a suspended potential probe and a Mach probe pair which are distributed in a three-step array, and by adopting the scheme, on the basis of the Langmuir probe measurement principle, the circumferential and polar Mach numbers of the same position of the plasma and parameters such as the plasma temperature, the plasma gradient, the plasma density, the plasma gradient, the radial electric field and the polar electric field can be measured at the same time by reasonably arranging the probe array, the measurement time on the nuclear fusion experimental device is greatly shortened, the safety performance is obviously improved, and meanwhile, the measurement of the same small-scale high-frequency transient disturbance parameter can be realized.

Description

technical field [0001] The invention relates to the technical field of boundary plasma electromagnetic diagnosis of a tokamak magnetic confinement nuclear fusion experimental device, in particular to a three-step composite Mach probe for plasma diagnosis. Background technique [0002] For magnetic confinement fusion devices, one of the most critical issues is how to reduce the particle transport and heat transport, and improve the confinement performance of the plasma, so as to achieve high temperature (~10keV), high density (>10 14 cm -3 ) long time (≥100 s) stable confinement of the plasma. Current research shows that the transport induced by turbulent flow, a microscopic random disturbance in the plasma, has a decisive influence on the confinement performance of magnetic confinement fusion. Its existence makes the plasma particle transport and heat transport levels far higher than expected by the neoclassical transport theory, which is the main reason why the level o...

AI Technical Summary

Problems solved by technology

However, in the process of measuring the boundary magnetic field and plasma parameters of the tokamak, due to its ultra-high temperature, the toroidal and poloidal Mach numbers, plasma temperature and its gradient, density and its gradient, radial electric field and polar The one-by-one measurement process of the electric field and other parameters greatly increases the measurement time on the nuclear fusion experimental device, which is risky

And because there are small-scale high-frequency transient disturbances in the boundary parameters of the tokamak, the measurement of the above parameters cannot realize the measurement of the same small-scale high-frequency transient disturbance parameters

Images