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Title: Impurity flows and plateau-regime poloidal density variation in a tokamak pedestal

Abstract

In the pedestal of a tokamak, the sharp radial gradients of density and temperature can give rise to poloidal variation in the density of impurities. At the same time, the flow of the impurity species is modified relative to the conventional neoclassical result. In this paper, these changes to the density and flow of a collisional impurity species are calculated for the case when the main ions are in the plateau regime. In this regime, it is found that the impurity density can be higher at either the inboard or outboard side. This finding differs from earlier results for banana- or Pfirsch-Schlueter-regime main ions, in which case the impurity density is always higher at the inboard side in the absence of rotation. Finally, the modifications to the impurity flow are also given for the other regimes of main-ion collisionality.

Authors:
 [1];  [2];  [3]
  1. Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts 02139 (United States)
  2. Department of Applied Physics, Nuclear Engineering, Chalmers University of Technology and Euratom-VR Association, Goeteborg (Sweden)
  3. Department of Nuclear Techniques, Budapest University of Technology and Economics, Association EURATOM, H-1111 Budapest (Hungary)
Publication Date:
OSTI Identifier:
22043500
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 18; Journal Issue: 9; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COLLISIONS; DENSITY; ELECTRON TEMPERATURE; ION TEMPERATURE; MODIFICATIONS; NEOCLASSICAL TRANSPORT THEORY; PFIRSCH-SCHLUETER REGIME; PLASMA; PLASMA DENSITY; PLASMA IMPURITIES; PLATEAU REGIME; ROTATION; TOKAMAK DEVICES

Citation Formats

Landreman, M, Fueloep, T, and Guszejnov, D. Impurity flows and plateau-regime poloidal density variation in a tokamak pedestal. United States: N. p., 2011. Web. doi:10.1063/1.3631819.
Landreman, M, Fueloep, T, & Guszejnov, D. Impurity flows and plateau-regime poloidal density variation in a tokamak pedestal. United States. https://doi.org/10.1063/1.3631819
Landreman, M, Fueloep, T, and Guszejnov, D. 2011. "Impurity flows and plateau-regime poloidal density variation in a tokamak pedestal". United States. https://doi.org/10.1063/1.3631819.
@article{osti_22043500,
title = {Impurity flows and plateau-regime poloidal density variation in a tokamak pedestal},
author = {Landreman, M and Fueloep, T and Guszejnov, D},
abstractNote = {In the pedestal of a tokamak, the sharp radial gradients of density and temperature can give rise to poloidal variation in the density of impurities. At the same time, the flow of the impurity species is modified relative to the conventional neoclassical result. In this paper, these changes to the density and flow of a collisional impurity species are calculated for the case when the main ions are in the plateau regime. In this regime, it is found that the impurity density can be higher at either the inboard or outboard side. This finding differs from earlier results for banana- or Pfirsch-Schlueter-regime main ions, in which case the impurity density is always higher at the inboard side in the absence of rotation. Finally, the modifications to the impurity flow are also given for the other regimes of main-ion collisionality.},
doi = {10.1063/1.3631819},
url = {https://www.osti.gov/biblio/22043500}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 9,
volume = 18,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2011},
month = {Thu Sep 15 00:00:00 EDT 2011}
}