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Lithium silicon compound radio-frequency wall processing technology capable of used in nuclear fusion experimental device

A technology of experimental equipment and processing technology, applied in thermonuclear fusion reactors, nuclear engineering, fusion reactors, etc., can solve problems such as difficulty in forming dense and high-quality coatings, inability to meet high-power, long-pulse physical experiments of fusion equipment, etc.

Inactive Publication Date: 2005-06-08
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Due to the low melting point and low hardness of the lithium material itself, it is difficult for the material itself to form a dense high-quality coating. At present, the high efficiency of in-situ lithiation of all devices in the world can only maintain the level of several guns, which is far from enough. Meet the needs of high-power, long-pulse physical experiments of fusion devices

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  • Lithium silicon compound radio-frequency wall processing technology capable of used in nuclear fusion experimental device

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Embodiment Construction

[0012] Before and after the lithium-silicon radio frequency composite wall treatment, sufficient ion swirl wall cleaning is required. One is to remove as much as possible the impurities adsorbed on the wall before the wall treatment; the other is to remove most of the hydrogen contained in the coating after the wall treatment.

[0013] Due to the strong chemical reactivity of lithium, it can react with the residual gas CO, CO in the ultra-high vacuum tokamak device at room temperature. 2 、H 2 , O 2 、CH 4 and H 2 O reacts chemically with the metal oxides on the wall. Therefore, before the in-situ radio frequency lithium-silicon composite wall treatment, the first wall needs to be fully cleaned by ion swirling walls to remove these impurities as much as possible; After the wall is cleaned, 10% silane and 90% helium need to be introduced, and after 10-20 minutes of radio frequency silicide, lithium vapor is sent into the tokamak tangentially (changed from the original radial d...

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Abstract

The invention discloses a lithium silicon composite radio frequency wall process technology which can be used in the nuclear fusion experimental apparatus. The feature of the invention is that according to the coat component of the wall and the structure design theory, the PACVD method is adopted. The lithium steam is entered to realize normal position radio frequency lithium silicon composite wall process in the HT-7 superconducting tokamak radio frequency silication process. Not only has the coat high performance, but also can improve the lithiation using life from several stirring baking to hundreds stirring baking. So this can create good wall condition for the high efficiency, long pulse plasma physical experiment. Meanwhile, the wall process can be did at the condition that longitudinal field coil is not demagnetization. It is a wall process mode which is more suitable for the ITER and future fusion reactor.

Description

technical field [0001] The invention relates to a lithium-silicon composite radio-frequency wall treatment process that can be used in a nuclear fusion experimental device. Background technique [0002] There are strong nonlinear correlations between the processes occurring on the plasma wall of magnetic confinement nuclear fusion, the properties of the plasma edge, and the properties of the main plasma. Through complex mechanisms, they change the energy and particle transport in the plasma. The plasma Bulk confinement and discharge performance, proper structure of the plasma edge is necessary to obtain high-performance thermonuclear fusion plasma. The surface state of the first wall of the tokamak plays a crucial role in controlling the impurity level in the plasma, recirculating fuel particles, and improving plasma confinement performance. This near-surface region where plasma-wall interaction (PSI) occurs can be improved by discharge cleaning and depositing thin films of...

Claims

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Application Information

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CPCY02E30/10
Inventor 陈俊凌
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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