skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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 [Nuclear Fusion 42 614 (2002)]. Modeling of C I spectral line profiles is discussed as a technique for evaluating the relative contribution of each mechanism and is applied to several types of DIII-D discharges. The line shapes are symmetric and have shifts of about -0.03 if they are produced solely from molecular dissociation, but they exhibit distinct asymmetries and shifts approaching -0.20 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 C2 emissions, is examined in light of conclusions drawn from the line-shape analysis.

Authors:
 [1];  [2];  [2];  [3]
  1. ORNL
  2. General Atomics, San Diego
  3. University of Toronto Institute for Aerospace Studies
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
967085
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Issue: 14
Country of Publication:
United States
Language:
English
Subject:
Spectroscopy; Carbon; Sputtering

Citation Formats

Isler, Ralph C, Brooks, N. H., West, W. P., and McLean, A. G. 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, Ralph C, Brooks, N. H., West, W. P., & McLean, A. G. 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, Ralph C, Brooks, N. H., West, W. P., and McLean, A. G. 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_967085,
title = {Determination of Carbon Release Mechanisms in the DIII-D Divertors from Analysis of C I Line Profiles},
author = {Isler, Ralph C and Brooks, N. H. and West, W. P. and McLean, A. G.},
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 [Nuclear Fusion 42 614 (2002)]. Modeling of C I spectral line profiles is discussed as a technique for evaluating the relative contribution of each mechanism and is applied to several types of DIII-D discharges. The line shapes are symmetric and have shifts of about -0.03 if they are produced solely from molecular dissociation, but they exhibit distinct asymmetries and shifts approaching -0.20 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 C2 emissions, is examined in light of conclusions drawn from the line-shape analysis.},
doi = {10.1063/1.2431352},
journal = {Physics of Plasmas},
number = 14,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}