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Title: Combined RF current drive and bootstrap current in tokamaks

Abstract

By calculating radio frequency current drive (RFCD) and the bootstrap current in a consistent kinetic manner, we find synergistic effects in the total noninductive current density in tokamaks [1]. We include quasilinear diffusion in the Drift Kinetic Equation (DKE) in order to generalize neoclassical theory to highly non-Maxwellian electron distributions due to RFCD. The parallel plasma current is evaluated numerically with the help of the FASTEP Fokker-Planck code [2]. Current drive efficiency is found to be significantly affected by neoclassical effects, even in cases where only circulating electrons interact with the waves. Predictions of the current drive efficiency are made for lower hybrid and electron cyclotron wave current drive scenarios in the presence of bootstrap current. (c) 1999 American Institute of Physics.

Authors:
 [1];  [1];  [1]
  1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
20216700
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Other Information: PBD: 20 Sep 1999; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CURRENT-DRIVE HEATING; TOKAMAK TYPE REACTORS; BOOTSTRAP CURRENT; ELECTRON DENSITY; CURRENT DENSITY; PLASMA SIMULATION; BOLTZMANN STATISTICS; THEORETICAL DATA

Citation Formats

Schultz, S. D., Bers, A., and Ram, A. K. Combined RF current drive and bootstrap current in tokamaks. United States: N. p., 1999. Web. doi:10.1063/1.59750.
Schultz, S. D., Bers, A., & Ram, A. K. Combined RF current drive and bootstrap current in tokamaks. United States. doi:10.1063/1.59750.
Schultz, S. D., Bers, A., and Ram, A. K. Mon . "Combined RF current drive and bootstrap current in tokamaks". United States. doi:10.1063/1.59750.
@article{osti_20216700,
title = {Combined RF current drive and bootstrap current in tokamaks},
author = {Schultz, S. D. and Bers, A. and Ram, A. K.},
abstractNote = {By calculating radio frequency current drive (RFCD) and the bootstrap current in a consistent kinetic manner, we find synergistic effects in the total noninductive current density in tokamaks [1]. We include quasilinear diffusion in the Drift Kinetic Equation (DKE) in order to generalize neoclassical theory to highly non-Maxwellian electron distributions due to RFCD. The parallel plasma current is evaluated numerically with the help of the FASTEP Fokker-Planck code [2]. Current drive efficiency is found to be significantly affected by neoclassical effects, even in cases where only circulating electrons interact with the waves. Predictions of the current drive efficiency are made for lower hybrid and electron cyclotron wave current drive scenarios in the presence of bootstrap current. (c) 1999 American Institute of Physics.},
doi = {10.1063/1.59750},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}