NIFS-057

FULL TEXT (PDF, 565 KB)


Author(s):

S.-I.Itoh, H.Maeda and Y.Miura

Title:

Improved Modes and the Evaluation of Confinement Improvement

Date of publication:

Oct. 1990

Key words:

Tokamak, Improved confinement, Evaluation of improvement, Fusion product, tau_ E and fuel purity, Dilution and Radiation

Abstract:

Various improved confinement modes in tokamak are surveyed and their characteristics are reviewed. To search for the potentiality as a fusion core plasma in reactor, an examination to evaluate the core performance has been made. The fusion product near the ignition condition, where Q is large, is used for the evaluation. The dilution of the fuel ion and the profile effect are simultaneously examined together with the obtained tau_E. Because of the fuel dilution and of the bulk radiation, the good performance does not always correspond to the mode with long tau_E. If their time evolution is taken into account the problem becomes more serious. Further extensive research to control the fuel purity is surely needed to ensure the long pulse operation.

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