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Author(s):
T. Tanabe, N. Noda and H. Nakamura
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Title:
Review of High Z Materials for PSI Applications
Date of publication:
June 1992
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Key words:
Divertor, Graphite, Hydrogen recycling, High Z, Impurities, Low Z, Molybdenum, Review, Sputtering,Tungsten
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Abstract:
Application of carbon based low Z materials to PFM has significantly improved plasma parameters in large tokamaks. There are, however, serious concerns of erosion, neutron damage etc. for application of low Z materials in future D-T burning machine. To apply high Z metals to PFM, there are several issues to be solved; high Z impurity production by sputtering , their accumulation in plasma center, and high radiation loss. Because of these concerns high Z metals are not widely employed nor planned to be used in the present large tokamaks. Since our efforts have been concentrated to optimize the low Z materials , little systematic investigations for high Z materials in tokamak have been done, lacking data base especially those concerning the impacts on plasma core. In order to employ high Z material as PFM near future, material properties related to impurity production and hydrogen recycling are reviewed and discussed what is important and what shall be done.
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