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Title: A model for the advantage of early electron cyclotron current drive in the suppression of neoclassical tearing modes

Abstract

An analytic model for the advantage of the early application of electron cyclotron current drive (ECCD) in the suppression of neoclassical tearing modes (NTMs) is presented. The improved performance of early ECCD is attributed to the second (smaller) saturation island width, which appears for sufficiently small (relative to the ECCD deposition width) critical island widths, in the strongly nonlinear growth rate profile. The operational range for the advantage of early ECCD is obtained, and it is shown that it is favored by broad deposition profiles. The preliminary experimental results in ASDEX Upgrade [H. Zohm et al., Nucl. Fusion 41, 197 (2001)] are consistent with the present model.

Authors:
; ;  [1];  [2]
  1. National Technical University of Athens, Association Euratom-Hellenic Republic (Greece)
  2. (Germany)
Publication Date:
OSTI Identifier:
20974934
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 4; Other Information: DOI: 10.1063/1.2720372; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASDEX TOKAMAK; DEPOSITION; ECR CURRENT DRIVE; INHIBITION; NEOCLASSICAL TRANSPORT THEORY; NONLINEAR PROBLEMS; PLASMA; PLASMA CONFINEMENT; TEARING INSTABILITY

Citation Formats

Lazaros, Avrilios, Maraschek, Marc, Zohm, Hartmut, and Max Planck Institute for Plasma Physics, Euratom Association, Garching Germany. A model for the advantage of early electron cyclotron current drive in the suppression of neoclassical tearing modes. United States: N. p., 2007. Web. doi:10.1063/1.2720372.
Lazaros, Avrilios, Maraschek, Marc, Zohm, Hartmut, & Max Planck Institute for Plasma Physics, Euratom Association, Garching Germany. A model for the advantage of early electron cyclotron current drive in the suppression of neoclassical tearing modes. United States. doi:10.1063/1.2720372.
Lazaros, Avrilios, Maraschek, Marc, Zohm, Hartmut, and Max Planck Institute for Plasma Physics, Euratom Association, Garching Germany. Sun . "A model for the advantage of early electron cyclotron current drive in the suppression of neoclassical tearing modes". United States. doi:10.1063/1.2720372.
@article{osti_20974934,
title = {A model for the advantage of early electron cyclotron current drive in the suppression of neoclassical tearing modes},
author = {Lazaros, Avrilios and Maraschek, Marc and Zohm, Hartmut and Max Planck Institute for Plasma Physics, Euratom Association, Garching Germany},
abstractNote = {An analytic model for the advantage of the early application of electron cyclotron current drive (ECCD) in the suppression of neoclassical tearing modes (NTMs) is presented. The improved performance of early ECCD is attributed to the second (smaller) saturation island width, which appears for sufficiently small (relative to the ECCD deposition width) critical island widths, in the strongly nonlinear growth rate profile. The operational range for the advantage of early ECCD is obtained, and it is shown that it is favored by broad deposition profiles. The preliminary experimental results in ASDEX Upgrade [H. Zohm et al., Nucl. Fusion 41, 197 (2001)] are consistent with the present model.},
doi = {10.1063/1.2720372},
journal = {Physics of Plasmas},
number = 4,
volume = 14,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}