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Author(s):
N. Ohyabu, A. Sagara, T. Ono, T. Kawamura and O. Motojima
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Title:
Carbon Sheet Pumping
Date of publication:
July 1993
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Key words:
carbon wall, hydrogen pumping, divertor, recycling control, confinement enhancement, charge exchange
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Abstract:
A new hydrogen pumping scheme has been proposed which controls recycling of the particles for significant improvement of the energy confinement in toroidal magnetic fusion devices. In this scheme, a part of the vacuum vessel surface near the divertor is covered with carbon sheets of a large surface area. Before discharge initiation, the sheets are baked up to 700 ~ 1000 C degree to remove the previously trapped hydrogen atoms. After being cooled down to below - 200 C degree, the unsaturated carbon sheets trap high energy charge exchange hydrogen atoms effectively during a discharge and overall pumping efficiency can be as high as ~ 50 %.
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