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Title: Effects of beam-driven poloidal rotation on the neoclassical bootstrap current

Abstract

Unbalanced neutral beam injection drives toroidal and poloidal rotations in a tokamak plasma. The beam toroidal momentum input drives the toroidal rotation, and the parallel friction between the thermal ions and fast ions induces the poloidal rotation. A theory of the beam-driven poloidal rotation and its effects on energy transport was given recently by Hinton and Kim. In this work, we extend their considerations to the effects on the neoclassical bootstrap current. For parameters of interest in present neutral beam heated tokamaks, the magnitude of the beam-driven poloidal rotation can be significantly larger than that of the standard neoclassical value due to the ion temperature gradient. The presence of this driven poloidal rotation will manifest itself in modification of the neoclassical bootstrap current. In the case of coinjection, the driven poloidal rotation is in the opposite direction to the rotation driven by the temperature gradient, therefore it enhances the bootstrap current. In comparison with the standard theoretical predictions of the neutral beam-driven current, that enhancement in the bootstrap current varies with the beam and plasma parameters. A calculation of the parallel transport coefficients associated with the driven poloidal flow in finite-aspect ratio tokamaks will be presented. Experimental conditions for observingmore » the enhancement in bootstrap current will be discussed.« less

Authors:
;  [1]
  1. General Atomics, San Diego, CA (United States)
Publication Date:
OSTI Identifier:
489455
Report Number(s):
CONF-960354-
TRN: 97:011602
DOE Contract Number:  
AC03-89ER51114
Resource Type:
Conference
Resource Relation:
Conference: International Sherwood fusion theory conference, Philadelphia, PA (United States), 18-20 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 international Sherwood fusion theory conference; PB: 244 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; BOOTSTRAP CURRENT; NEOCLASSICAL TRANSPORT THEORY; TOKAMAK DEVICES; BEAM-PLASMA SYSTEMS; NEUTRAL ATOM BEAM INJECTION; TEMPERATURE GRADIENTS

Citation Formats

Lin-Liu, Y R, and Hinton, F L. Effects of beam-driven poloidal rotation on the neoclassical bootstrap current. United States: N. p., 1996. Web.
Lin-Liu, Y R, & Hinton, F L. Effects of beam-driven poloidal rotation on the neoclassical bootstrap current. United States.
Lin-Liu, Y R, and Hinton, F L. 1996. "Effects of beam-driven poloidal rotation on the neoclassical bootstrap current". United States.
@article{osti_489455,
title = {Effects of beam-driven poloidal rotation on the neoclassical bootstrap current},
author = {Lin-Liu, Y R and Hinton, F L},
abstractNote = {Unbalanced neutral beam injection drives toroidal and poloidal rotations in a tokamak plasma. The beam toroidal momentum input drives the toroidal rotation, and the parallel friction between the thermal ions and fast ions induces the poloidal rotation. A theory of the beam-driven poloidal rotation and its effects on energy transport was given recently by Hinton and Kim. In this work, we extend their considerations to the effects on the neoclassical bootstrap current. For parameters of interest in present neutral beam heated tokamaks, the magnitude of the beam-driven poloidal rotation can be significantly larger than that of the standard neoclassical value due to the ion temperature gradient. The presence of this driven poloidal rotation will manifest itself in modification of the neoclassical bootstrap current. In the case of coinjection, the driven poloidal rotation is in the opposite direction to the rotation driven by the temperature gradient, therefore it enhances the bootstrap current. In comparison with the standard theoretical predictions of the neutral beam-driven current, that enhancement in the bootstrap current varies with the beam and plasma parameters. A calculation of the parallel transport coefficients associated with the driven poloidal flow in finite-aspect ratio tokamaks will be presented. Experimental conditions for observing the enhancement in bootstrap current will be discussed.},
doi = {},
url = {https://www.osti.gov/biblio/489455}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1996},
month = {Tue Dec 31 00:00:00 EST 1996}
}

Conference:
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