Tokamak divertor target plate temperature accurate measurement method

Abstract

The invention relates to the field of infrared temperature measurement, in particular to a tokamak divertor target plate temperature accurate measurement method. The method comprises the following steps: 1) fitting the relation between the radiation energy emitted by a blackbody furnace and the radiant energy measured by a thermal imager; 2) exploring the relation between the emissivity and the temperature in the baking state, and fitting a curve of the temperature and the emissivity; 3) in the discharge state, calculating the real temperature of the divertor target plate according to the grayvalue of the thermal imager picture. Therefore, the emissivity obtained by the method is a value which changes along with the change of the temperature, and the values of the emissivity of the different detection points are different, the influence of the emissivity as a fixed value on the temperature measurement result is avoided, and the temperature measurement result is quite high in precision; the transmission of the radiation energy of the divertor target plate is under the condition of vacuum, the interference of atmospheric radiation to target radiation is avoided, and the accuracy ofthe measurement result is further improved.

Description

Technical field: [0001] The invention relates to the field of infrared temperature measurement, in particular to a method for accurately measuring the temperature of a target plate of a tokamak divertor. Background technique: [0002] The tokamak device is a device for nuclear fusion research. When the tokamak device is working, a large number of plasmas run at high speed in its cavity under the action of magnetic confinement. In the tokamak device, two methods are usually adopted to separate the central high-temperature plasma from the wall of the vacuum chamber: (1) using a restrictor: the outer edge of the central plasma is tangent to the aperture of the restrictor, and the The plasma is divided into two regions, inner and outer, and the magnetic surface tangent to the aperture bar is called the last closed magnetic surface; (2) Using a divertor: the specially designed external coil current and the main plasma current generate a magnetic field or two The configuration of...

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Problems solved by technology

[0018] In the prior art, when the target plate of the tokamak divertor is discharged, the contact temperature measurement cannot quickly respond to the rapid change of temperature in the temperature measurement, and the empirical value of the emissivity is used in the non-contact temperature measurement or the emissivity is calibrated by taking several points In practice, the emissivity is not a fixed value. The emissivity changes with the temperature, and the divertor target plate is not a Lambertian body. The emissivity of the same point measured at different angles is also different. Yes, so the existing tokamak uses a fixed value of emissivity as the basis for temperature measurement, which will inevitably introduce principle errors

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