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Title: Determination of carbon release mechanisms in the DIII-D divertors from analysis of C I line profiles

Abstract

During typical operation of the DIII-D tokamak, physical and chemical sputtering are the most important mechanisms for release of carbon at the divertor targets [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. Modeling of C I spectral line profiles is discussed as a technique for evaluating the relative contribution of each process and is applied to several types of discharges. The line shapes are symmetric and have shifts of about -0.03 A ring if they are produced solely from molecular dissociation, but they exhibit distinct asymmetries and shifts approaching -0.20 A ring if generated by physical sputtering. Modeled profiles must, in general, take account of both mechanisms in order to match experimental data. An alternate approach to distinguishing between the two processes, which relies on the relative intensities of C I, CD, and C{sub 2} emissions, is examined in light of conclusions drawn from the line-shape analysis.

Authors:
; ; ;  [1];  [2];  [3]
  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8072 (United States)
  2. (United States)
  3. (Canada)
Publication Date:
OSTI Identifier:
20960105
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 1; Other Information: DOI: 10.1063/1.2431352; (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; ASYMMETRY; CARBON; DIVERTORS; DOUBLET-3 DEVICE; PLASMA; PLASMA CONFINEMENT; PLASMA IMPURITIES; PLASMA SIMULATION; THERMONUCLEAR REACTORS; WALL EFFECTS

Citation Formats

Isler, R. C., Brooks, N. H., West, W. P., McLean, A. G., General Atomics, San Diego, California 92186-5068, and University of Toronto Institute for Aerospace Studies, Toronto, M3H5T6. Determination of carbon release mechanisms in the DIII-D divertors from analysis of C I line profiles. United States: N. p., 2007. Web. doi:10.1063/1.2431352.
Isler, R. C., Brooks, N. H., West, W. P., McLean, A. G., General Atomics, San Diego, California 92186-5068, & University of Toronto Institute for Aerospace Studies, Toronto, M3H5T6. Determination of carbon release mechanisms in the DIII-D divertors from analysis of C I line profiles. United States. doi:10.1063/1.2431352.
Isler, R. C., Brooks, N. H., West, W. P., McLean, A. G., General Atomics, San Diego, California 92186-5068, and University of Toronto Institute for Aerospace Studies, Toronto, M3H5T6. Mon . "Determination of carbon release mechanisms in the DIII-D divertors from analysis of C I line profiles". United States. doi:10.1063/1.2431352.
@article{osti_20960105,
title = {Determination of carbon release mechanisms in the DIII-D divertors from analysis of C I line profiles},
author = {Isler, R. C. and Brooks, N. H. and West, W. P. and McLean, A. G. and General Atomics, San Diego, California 92186-5068 and University of Toronto Institute for Aerospace Studies, Toronto, M3H5T6},
abstractNote = {During typical operation of the DIII-D tokamak, physical and chemical sputtering are the most important mechanisms for release of carbon at the divertor targets [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. Modeling of C I spectral line profiles is discussed as a technique for evaluating the relative contribution of each process and is applied to several types of discharges. The line shapes are symmetric and have shifts of about -0.03 A ring if they are produced solely from molecular dissociation, but they exhibit distinct asymmetries and shifts approaching -0.20 A ring if generated by physical sputtering. Modeled profiles must, in general, take account of both mechanisms in order to match experimental data. An alternate approach to distinguishing between the two processes, which relies on the relative intensities of C I, CD, and C{sub 2} emissions, is examined in light of conclusions drawn from the line-shape analysis.},
doi = {10.1063/1.2431352},
journal = {Physics of Plasmas},
number = 1,
volume = 14,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}