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

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4919393· OSTI ID:1286838
 [1];  [2];  [3];  [3];  [2];  [3];  [4];  [5]
  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)
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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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; FC02-99ER54512
OSTI ID:
1286838
Alternate ID(s):
OSTI ID: 1228605
Journal Information:
Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

References (14)

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
High confinement/high radiated power H-mode experiments in Alcator C-Mod and consequences for International Thermonuclear Experimental Reactor (ITER) Q DT  = 10 operation journal May 2011
Recent Improvements in the EMC3-Eirene Code: Recent Improvements in the EMC3-Eirene Code journal June 2014
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

Cited By (2)

3D effects of neon injection positions on the toroidally symmetric/asymmetric heat flux distribution on EAST journal January 2020
Radiative heat exhaust in Alcator C-Mod I-mode plasmas journal March 2019

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