Optical mass spectrometer diagnosis technology for distinguishing helium and deuterium in Tokamak residual gas by using penning discharge

A tokamak and Penning discharge technology, which is applied in the field of neutral gas measurement in fusion reactor divertors, can solve the problem of inability to distinguish reaction fuel gas, reaction product gas, etc., achieve effective real-time monitoring and reduce technical difficulty.

Active Publication Date: 2014-08-20
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The purpose of the present invention is to solve the reaction fuel gas (D 2 ) and the problem of the reaction product gas (He)

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  • Optical mass spectrometer diagnosis technology for distinguishing helium and deuterium in Tokamak residual gas by using penning discharge
  • Optical mass spectrometer diagnosis technology for distinguishing helium and deuterium in Tokamak residual gas by using penning discharge

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Embodiment Construction

[0032] Such as Figure 1-2 As shown, an optical mass spectrometer diagnostic technique using Penning discharge to distinguish helium and deuterium in tokamak residual gas, using deuterium (D 2 ) and helium (He) discharge produced by the low-temperature plasma emission spectrum of the characteristic wavelength is very different, the gas deuterium (D 2 ) and helium (He) into the ionization chamber, the gas to be measured is ionized by the Penning discharge system to generate a low-temperature plasma, and then the plasma is analyzed to generate an emission spectrum, and then the two gases (He and D 2 ), specifically comprising the following steps:

[0033] 1), EAST is a divertor position type tokamak device, the sampling pipeline of the diagnostic system is connected with the EAST divertor and the gas to be tested is sampled from the EAST divertor area and delivered to the ionization chamber;

[0034] 2) The Penning discharge system installed on one side of the ionization chamb...

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Abstract

The invention discloses an optical mass spectrometer diagnosis technology for distinguishing helium and deuterium Tokamak residual gas by using penning discharge, and the difference between the characteristic spectrums He-I and D-alpha of the low temperature plasma emission spectrums produced by D2 and He discharge is utilized. The D2 and He to be measured are introduced into an ionization chamber, and a penning discharge system installed at one side of the ionization chamber ionizes the gas to be measured to produce low temperature plasma; then the He-I spectral line and D-alpha spectrum generated by the plasma are analyzed, so as to measure the absolute content of the two gases (He and D2). The invention realizes the diagnosis technology for real-time monitoring of the evolution of He and D2 in Tokamak, thus solving the problem that a commercial mass spectrometer cannot distinguish He and D2 due to close molecular mass numbers (He:4.003, D2:4.028). The diagnosis technology provides direct engineering and physical experiences for ITER and possible future in situ measurement of He / D2 on DEMO.

Description

Technical field: [0001] The invention relates to the field of measurement of neutral gas in a divertor of a fusion reactor, specifically utilizing the different characteristic wavelengths of helium and deuterium discharges in the low-temperature plasma generated by Penning discharges, and designing through the combination of optical fibers, lens groups, and filters, etc. It is a technical means to quantitatively measure the partial pressure of helium and deuterium. Background technique: [0002] In the tokamak fusion reaction, no matter D-D or D-T, part of its energy is released in the form of a particle (which becomes helium after neutralization). In order to prevent the reaction product (He) from gradually diluting the fuel and eventually causing the plasma to go out, the He generated by the reaction must be extracted from the plasma as fast as possible in the next generation thermonuclear fusion device (ITER) (the content of He in the plasma must be less than 10%, otherw...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/68
Inventor 王厚银胡建生
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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