Method for identifying space position and structure of tearing mode magnetic island in Tokamak
A tokamak and spatial location technology, applied in nuclear reactors, nuclear power generation, climate sustainability, etc., can solve problems such as economic loss, termination of fusion reaction, damage to device wall materials, etc., to optimize parameter settings and improve accuracy Effect
Active Publication Date: 2021-10-22
SOUTHWESTERN INST OF PHYSICS
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When the magnetic island is large enough, these charged particles will directly hit the outer wall of the device, resulting in the termination of the fusion reaction and the destruction of the material of the device wall, causing great economic losses
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[0043] The present invention will be further described below by means of the accompanying drawings and specific embodiments.
[0044] Tokamak is a device that uses a strong magnetic field to confine high-temperature plasma in an annular container to undergo thermonuclear fusion reactions. Its cross-section is as follows: figure 1 As shown, R and Z represent the horizontal direction and vertical direction, respectively, r, θ and φ represent the radial radius, polar angle and circumferential angle, respectively, O is the center of the tokamak ring, R 0 is the plasma center, a is the plasma radius.
[0045] figure 1 The points in are the measurement positions of the microwave electron cyclotron radiation imaging system, which is a microwave imaging system used to measure the evolution of electron temperature (or temperature fluctuation) with time during the fusion reaction of a magnetic confinement nuclear fusion tokamak , is a very important diagnostic tool on the tokamak, and...
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The invention belongs to a magnetic confinement nuclear fusion technology, and particularly relates to a method for identifying the spatial position and structure of a tearing mode magnetic island in tokamak. The method comprises the following steps of: obtaining the polar section temperature of tokamak plasma, obtaining the frequency corresponding to the maximum power as the characteristic frequency of a tearing mode, determining the relative electron temperature disturbance after smoothing, determining the position of a tearing die magnetic field rational surface, and judging a point X and a point O of the tearing mode magnetic island to obtain the spatial position of the tearing mode magnetic island, the rotation direction of the tearing mode and the polar modulus. Based on direct experimental measurement data, any assumption and approximate conditions do not need to be set, the accuracy is improved, the method has the advantages of being simple, rapid, visual and efficient, and an important basis can be provided for accurately controlling the tearing mode in the Tokamak plasma.
Description
technical field [0001] The invention belongs to magnetic confinement nuclear fusion technology, and in particular relates to a method for identifying the spatial position and structure of a magnetic island of a tear mode in a tokamak. Background technique [0002] As a clean energy with sufficient fuel reserves, magnetic confinement nuclear fusion is considered to be one of the important ways to finally solve the human energy crisis. There are usually various instabilities in the magnetic confinement fusion tokamak plasma, and they will seriously reduce the plasma confinement performance. The tearing mode is one of the most threatening instabilities, it will destroy the well-constrained nested magnetic surface in the tokmak, and the reconnection of magnetic field lines will occur to form a magnetic island structure (the center of the magnetic island is defined as point O, and the reconnection The joint point is defined as point X), which causes the rapid radial transport of...
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IPC IPC(8): G21B1/05
CPCG21B1/057Y02E30/10
Inventor 蒋敏石中兵陈伟施培万
Owner SOUTHWESTERN INST OF PHYSICS