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Title: Turbulent transport of impurities and their effect on energy confinement

Abstract

By presenting linear and nonlinear gyrokinetic studies, based on a balanced neutral beam injection deuterium discharge from the DIII-D tokamak, we demonstrate that impurities alter the scaling of the transport on the charge and mass of the main species, and even more importantly, they can dramatically change the energy transport even in relatively small quantities. A poloidally varying equilibrium electrostatic potential can lead to a strong reduction or sign change of the impurity peaking factor due to the combined effect of the in–out impurity density asymmetry and the E × B drift of impurities. Finally, we present an approximate expression for the impurity peaking factor and demonstrate that impurity peaking is not significantly affected by impurity self-collisions.

Authors:
 [1];  [2];  [2];  [3]
  1. Chalmers Univ. of Technology, Göteborg (Sweden). Dept. of Applied Physics; Euratom-VR Association, Göteborg (Sweden); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  2. Chalmers Univ. of Technology, Göteborg (Sweden). Dept. of Applied Physics; Euratom-VR Association, Göteborg (Sweden)
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565027
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 55; Journal Issue: 7; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; physics

Citation Formats

Pusztai, I., Mollén, A., Fülöp, T., and Candy, J. Turbulent transport of impurities and their effect on energy confinement. United States: N. p., 2013. Web. doi:10.1088/0741-3335/55/7/074012.
Pusztai, I., Mollén, A., Fülöp, T., & Candy, J. Turbulent transport of impurities and their effect on energy confinement. United States. doi:10.1088/0741-3335/55/7/074012.
Pusztai, I., Mollén, A., Fülöp, T., and Candy, J. Fri . "Turbulent transport of impurities and their effect on energy confinement". United States. doi:10.1088/0741-3335/55/7/074012. https://www.osti.gov/servlets/purl/1565027.
@article{osti_1565027,
title = {Turbulent transport of impurities and their effect on energy confinement},
author = {Pusztai, I. and Mollén, A. and Fülöp, T. and Candy, J.},
abstractNote = {By presenting linear and nonlinear gyrokinetic studies, based on a balanced neutral beam injection deuterium discharge from the DIII-D tokamak, we demonstrate that impurities alter the scaling of the transport on the charge and mass of the main species, and even more importantly, they can dramatically change the energy transport even in relatively small quantities. A poloidally varying equilibrium electrostatic potential can lead to a strong reduction or sign change of the impurity peaking factor due to the combined effect of the in–out impurity density asymmetry and the E × B drift of impurities. Finally, we present an approximate expression for the impurity peaking factor and demonstrate that impurity peaking is not significantly affected by impurity self-collisions.},
doi = {10.1088/0741-3335/55/7/074012},
journal = {Plasma Physics and Controlled Fusion},
number = 7,
volume = 55,
place = {United States},
year = {2013},
month = {6}
}

Journal Article:
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Cited by: 9 works
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