Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Three-dimensional simulation of H-mode plasmas with localized divertor impurity injection on Alcator C-Mod using the edge transport code EMC3-EIRENE

Abstract

We study experiments in Alcator C-Mod to assess the level of toroidal asymmetry in divertor conditions resulting from poloidally and toroidally localized extrinsic impurity gas seeding show a weak toroidal peaking (~1.1) in divertor electron temperatures for high-power enhanced D-alpha H-modeplasmas. This is in contrast to similar experiments in Ohmically heated L-modeplasmas, which showed a clear toroidal modulation in the divertor electron temperature. Modeling of these experiments using the 3D edge transport code EMC3-EIRENE [Y. Feng et al., J. Nucl. Mater. 241, 930 (1997)] qualitatively reproduces these trends, and indicates that the different response in the simulations is due to the ionization location of the injected nitrogen. Low electron temperatures in the private flux region (PFR) in L-mode result in a PFR plasma that is nearly transparent to neutral nitrogen, while in H-mode the impurities are ionized in close proximity to the injection location, with this latter case yielding a largely axisymmetric radiation pattern in the scrape-off-layer. In conclusion, the consequences for the ITER gas injection system are discussed. Quantitative agreement with the experiment is lacking in some areas, suggesting potential areas for improving the physics model in EMC3-EIRENE.

Authors:
 [1];  [2];  [3];  [3];  [2];  [3];  [4];  [5]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. University of York, Heslington (United Kingdom)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  4. ITER Organization, St. Paul Lez Durance (France)
  5. Max Planck Institute for Plasma Physics, Greifswald (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1286838
Alternate Identifier(s):
OSTI ID: 1228605
Grant/Contract Number:  
AC05-00OR22725; FC02-99ER54512
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Lore, Jeremy D., Reinke, M. L., Brunner, D., LaBombard, B. A., Lipschultz, B., Terry, J. L., Pitts, R. A., and Feng, Y. Three-dimensional simulation of H-mode plasmas with localized divertor impurity injection on Alcator C-Mod using the edge transport code EMC3-EIRENE. United States: N. p., 2015. Web. doi:10.1063/1.4919393.
Copy to clipboard
Lore, Jeremy D., Reinke, M. L., Brunner, D., LaBombard, B. A., Lipschultz, B., Terry, J. L., Pitts, R. A., & Feng, Y. Three-dimensional simulation of H-mode plasmas with localized divertor impurity injection on Alcator C-Mod using the edge transport code EMC3-EIRENE. United States. https://doi.org/10.1063/1.4919393
Copy to clipboard
Lore, Jeremy D., Reinke, M. L., Brunner, D., LaBombard, B. A., Lipschultz, B., Terry, J. L., Pitts, R. A., and Feng, Y. Tue . "Three-dimensional simulation of H-mode plasmas with localized divertor impurity injection on Alcator C-Mod using the edge transport code EMC3-EIRENE". United States. https://doi.org/10.1063/1.4919393. https://www.osti.gov/servlets/purl/1286838.
Copy to clipboard
@article{osti_1286838,
title = {Three-dimensional simulation of H-mode plasmas with localized divertor impurity injection on Alcator C-Mod using the edge transport code EMC3-EIRENE},
author = {Lore, Jeremy D. and Reinke, M. L. and Brunner, D. and LaBombard, B. A. and Lipschultz, B. and Terry, J. L. and Pitts, R. A. and Feng, Y.},
abstractNote = {We study experiments in Alcator C-Mod to assess the level of toroidal asymmetry in divertor conditions resulting from poloidally and toroidally localized extrinsic impurity gas seeding show a weak toroidal peaking (~1.1) in divertor electron temperatures for high-power enhanced D-alpha H-modeplasmas. This is in contrast to similar experiments in Ohmically heated L-modeplasmas, which showed a clear toroidal modulation in the divertor electron temperature. Modeling of these experiments using the 3D edge transport code EMC3-EIRENE [Y. Feng et al., J. Nucl. Mater. 241, 930 (1997)] qualitatively reproduces these trends, and indicates that the different response in the simulations is due to the ionization location of the injected nitrogen. Low electron temperatures in the private flux region (PFR) in L-mode result in a PFR plasma that is nearly transparent to neutral nitrogen, while in H-mode the impurities are ionized in close proximity to the injection location, with this latter case yielding a largely axisymmetric radiation pattern in the scrape-off-layer. In conclusion, the consequences for the ITER gas injection system are discussed. Quantitative agreement with the experiment is lacking in some areas, suggesting potential areas for improving the physics model in EMC3-EIRENE.},
doi = {10.1063/1.4919393},
journal = {Physics of Plasmas},
number = 5,
volume = 22,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 2015},
month = {Tue Apr 28 00:00:00 EDT 2015}
}
Copy to clipboard
Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.4919393
Copyright Statement
Other availability
Search WorldCat Search WorldCat to find libraries that may hold this journal
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

Works referenced in this record:

Obtaining reactor-relevant divertor conditions in tokamaks
journal, April 2011

Simulation of ASDEX Upgrade Ohmic plasmas for SOLPS code validation
journal, December 2008

B2-EIRENE simulation of ASDEX and ASDEX-Upgrade scrape-off layer plasmas
journal, December 1992

3D fluid modelling of the edge plasma by means of a Monte Carlo technique
journal, March 1999

Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985

A full tungsten divertor for ITER: Physics issues and design status
journal, July 2013

A 3D Monte Carlo code for plasma transport in island divertors
journal, February 1997

Recent Improvements in the EMC3-Eirene Code: Recent Improvements in the EMC3-Eirene Code
journal, June 2014

  • Feng, Y.; Frerichs, H.; Kobayashi, M.
  • Contributions to Plasma Physics, Vol. 54, Issue 4-6
  • DOI: 10.1002/ctpp.201410092

Transport and drift-driven plasma flow components in the Alcator C-Mod boundary plasma
journal, January 2013

Implementation of the 3D edge plasma code EMC3-EIRENE on NSTX
journal, May 2012

Observations of cold, high density plasma in the private flux region of the Alcator C-Mod divertor
journal, March 2001

H mode confinement in Alcator C-Mod
journal, June 1997

Electric field-induced plasma convection in tokamak divertors
journal, April 2000

  • Boedo, J. A.; Schaffer, M. J.; Maingi, R.
  • Physics of Plasmas, Vol. 7, Issue 4
  • DOI: 10.1063/1.873915
    Sort by:
    [ × clear filter / sort ]

    Works referencing / citing this record:

    3D effects of neon injection positions on the toroidally symmetric/asymmetric heat flux distribution on EAST
    journal, January 2020

    • Liu, B.; Dai, S. Y.; Kawamura, G.
    • Plasma Physics and Controlled Fusion, Vol. 62, Issue 3
    • DOI: 10.1088/1361-6587/ab6072

    Radiative heat exhaust in Alcator C-Mod I-mode plasmas
    journal, March 2019

      Sort by:
      [ × clear filter / sort ]

      Similar Records in DOE PAGES and OSTI.GOV collections: