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Title: Impurity poloidal rotation velocity in tokamaks

Abstract

The impurity poloidal flow velocity, [ital v][sub [theta][ital z]], was measured for Ohmic discharges in banana, plateau, and Pfirsch--Schluter regimes in the Texas Experimental Tokamak (TEXT) [K. W. Gentle, Nucl. Tech./Fusion [bold 1], 479 (1981)]. The velocities were measured spectroscopically using the Doppler shift of a C[sup +4] emission line, and then compared with neoclassical predictions that were evaluated with sets of measured plasma profiles that included the radial electric field. Specifically, neoclassical theory was used to relate [ital v][sub [theta][ital z]] to measured radial profiles, but it was not used to predict any profiles other than [ital v][sub [theta][ital z]]([ital r]). On that basis, neoclassical theory adequately describes [ital v][sub [theta][ital z]]. The prediction is dominated by the impurity and ion density scale lengths. Contributions proportional to the parallel viscosity ratio do not contribute significantly to the prediction in this experiment, and thus are not tested. Similarly, though charge exchange momentum loss may significantly retard the toroidal flow velocity and introduces an unusual electric field dependence into the poloidal flow velocity, the charge exchange contribution to [ital v][sub [theta][ital z]] is too small to be detected.

Authors:
;  [1]
  1. Fusion Research Center, MS 61510, The University of Texas at Austin, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
5142739
DOE Contract Number:  
FG05-88ER53267
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas; (United States)
Additional Journal Information:
Journal Volume: 1:4; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; PLASMA IMPURITIES; BANANA REGIME; DOPPLER EFFECT; ION DENSITY; NEOCLASSICAL TRANSPORT THEORY; PFIRSCH-SCHLUETER REGIME; PLATEAU REGIME; ROTATING PLASMA; VISCOSITY; CLOSED PLASMA DEVICES; IMPURITIES; PLASMA; THERMONUCLEAR DEVICES; TRANSPORT THEORY; TRAPPING; 700330* - Plasma Kinetics, Transport, & Impurities- (1992-)

Citation Formats

Meigs, A G, and Rowan, W L. Impurity poloidal rotation velocity in tokamaks. United States: N. p., 1994. Web. doi:10.1063/1.870755.
Meigs, A G, & Rowan, W L. Impurity poloidal rotation velocity in tokamaks. United States. https://doi.org/10.1063/1.870755
Meigs, A G, and Rowan, W L. 1994. "Impurity poloidal rotation velocity in tokamaks". United States. https://doi.org/10.1063/1.870755.
@article{osti_5142739,
title = {Impurity poloidal rotation velocity in tokamaks},
author = {Meigs, A G and Rowan, W L},
abstractNote = {The impurity poloidal flow velocity, [ital v][sub [theta][ital z]], was measured for Ohmic discharges in banana, plateau, and Pfirsch--Schluter regimes in the Texas Experimental Tokamak (TEXT) [K. W. Gentle, Nucl. Tech./Fusion [bold 1], 479 (1981)]. The velocities were measured spectroscopically using the Doppler shift of a C[sup +4] emission line, and then compared with neoclassical predictions that were evaluated with sets of measured plasma profiles that included the radial electric field. Specifically, neoclassical theory was used to relate [ital v][sub [theta][ital z]] to measured radial profiles, but it was not used to predict any profiles other than [ital v][sub [theta][ital z]]([ital r]). On that basis, neoclassical theory adequately describes [ital v][sub [theta][ital z]]. The prediction is dominated by the impurity and ion density scale lengths. Contributions proportional to the parallel viscosity ratio do not contribute significantly to the prediction in this experiment, and thus are not tested. Similarly, though charge exchange momentum loss may significantly retard the toroidal flow velocity and introduces an unusual electric field dependence into the poloidal flow velocity, the charge exchange contribution to [ital v][sub [theta][ital z]] is too small to be detected.},
doi = {10.1063/1.870755},
url = {https://www.osti.gov/biblio/5142739}, journal = {Physics of Plasmas; (United States)},
issn = {1070-664X},
number = ,
volume = 1:4,
place = {United States},
year = {Fri Apr 01 00:00:00 EST 1994},
month = {Fri Apr 01 00:00:00 EST 1994}
}