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Impurity toroidal rotation and transport in Alcator C-Mod ohmic high confinement mode plasmas

Authors :
S.M. Wolfe
Martin Greenwald
A.E. Hubbard
J. A. Snipes
D. A. Mossessian
J.L. Terry
J. E. Rice
E.S. Marmar
John Goetz
T. Sunn Pedersen
Robert Granetz
Ian H. Hutchinson
Source :
Scopus-Elsevier

Abstract

Central toroidal rotation and impurity transport coefficients have been determined in Alcator C-Mod [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] Ohmic high confinement mode (H-mode) plasmas from observations of x-ray emission following impurity injection. Rotation velocities up to 3×104 m/sec in the co-current direction have been observed in the center of the best Ohmic H-mode plasmas. Purely ohmic H-mode plasmas display many characteristics similar to ion cyclotron range of frequencies (ICRF) heated H-mode plasmas, including the scaling of the rotation velocity with plasma parameters and the formation of edge pedestals in the electron density and temperature profiles. Very long impurity confinement times (∼1 sec) are seen in edge localized mode-free (ELM-free) Ohmic H-modes and the inward impurity convection velocity profile has been determined to be close to the calculated neoclassical profile.

Details

Database :
OpenAIRE
Journal :
Scopus-Elsevier
Accession number :
edsair.doi.dedup.....289e970555d9f58f0518692b25d08a1d