Method for cleaning first mirror for tokamak device by direct-current cascade arc plasma torch

Abstract

The invention provides a method for cleaning a first mirror for a tokamak device by a direct-current cascade arc plasma torch. The method for cleaning the first mirror for the tokamak device by the direct-current cascade arc plasma torch comprises the following steps of presetting a working gas and measuring the emission spectrum of a standard lamp; turning on a vacuum apparatus, a water cooling apparatus and a gas inlet apparatus in succession, and completing the preparatory work of the discharging of the direct-current cascade arc plasma torch; discharging to generate the direct-current cascade arc plasma torch, and cleaning a sample of the first mirror; changing a relevant cleaning parameter to carry out personalized cleaning on the sample of the first mirror; detecting the recovery condition of the reflectivity of the sample of the first mirror in situ after the cleaning is carried out for a certain time, and determining whether to clean continuously or not according to a detection result; if the continuous cleaning is needed, repeatedly cleaning until cleaning requirements are met. The direct-current cascade arc plasma torch adopted for the method for cleaning the first mirror for the tokamak device by the direct-current cascade arc plasma torch is many in adjustable discharging parameter, good in directionality and free from impurity; the large-area, long-distance, uniform and quick removal of an impurity sedimentary formation on the surface of the first mirror can be realized; the on-line detection of the reflectivity is completed.

Description

technical field [0001] The invention relates to magnetic confinement nuclear fusion technology, in particular to a method for cleaning the first mirror of a tokamak with a DC cascade arc plasma torch. Background technique [0002] In the experimental research of magnetic confinement nuclear fusion, due to the complex and severe discharge environment inside the tokamak device, many experimental parameters must be obtained through optical diagnostic techniques. However, due to the complex structure of the tokamak, some parts of the plasma are not conducive to the detection of optical signals. At this time, some mirrors are needed to transmit the optical detection signal to the detection system, and these mirrors are the first mirrors. [0003] During the discharge process of the tokamak device, in addition to generating high-temperature plasma with hundreds of millions of degrees, it is also accompanied by intense heat flux radiation, high-energy particle radiation and variou...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to propose a method for cleaning the first mirror of the Tokamak with a DC cascaded arc plasma torch, aiming at the poor cleaning effect of the above-mentioned prior cleaning method for the first mirror of the Tokamak. The cascade arc plasma torch has the advantages of multiple adjustable discharge parameters, good directionality, and no impurities. It can achieve large-area, long-distance, uniform, and rapid removal of impurity deposits on the surface of the first mirror, and complete online detection of reflectivity.

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