Impurity poloidal rotation velocity in tokamaks

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870755· OSTI ID:5142739

Meigs, A G; Rowan, W L ^[1]

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1. Fusion Research Center, MS 61510, The University of Texas at Austin, Austin, Texas 78712 (United States)

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.

• DOE Contract Number: FG05-88ER53267
• OSTI ID: 5142739
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:4; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330* -- Plasma Kinetics
Transport
& Impurities-- (1992-)
BANANA REGIME
CLOSED PLASMA DEVICES
DOPPLER EFFECT
IMPURITIES
ION DENSITY
NEOCLASSICAL TRANSPORT THEORY
PFIRSCH-SCHLUETER REGIME
PLASMA
PLASMA IMPURITIES
PLATEAU REGIME
ROTATING PLASMA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY
TRAPPING
VISCOSITY