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Author(s):
K.Itoh and S.-I.Itoh
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Title:
Peaked-Density Profile Mode and Improved Confinement in Helical Systems
Date of publication:
Oct. 1990
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Key words:
Improved Confinement, Peaked Density Profile Anomalous Transport, Helical Systems, Tokamaks
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Abstract:
The difference in the effect of the peaked density profile on the improved transport between tokamaks and toroidal-helical systems is discussed. Based on the theory that the rotational shear causes the inward pinch in tokamaks, the magnitude of the possible inward pinch is estimated. Owing to the strong damping of the rotation due to the helical ripple, the anomalous inward pinch would be small. This may be consistent with recent observation in Heliotron E device that the density peakedness of n(0)/< n >=5 does not correspond to the improved confinement.
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