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Title: Toroidally symmetric plasma vortex at tokamak divertor null point

Abstract

Reduced MHD equations are used for studying toroidally symmetric plasma dynamics near the divertor null point. Numerical solution of these equations exhibits a plasma vortex localized at the null point with the time-evolution defined by interplay of the curvature drive, magnetic restoring force, and dissipation. Convective motion is easier to achieve for a second-order null (snowflake) divertor than for a regular x-point configuration, and the size of the convection zone in a snowflake configuration grows with plasma pressure at the null point. In conclusion, the trends in simulations are consistent with tokamak experiments which indicate the presence of enhanced transport at the null point.

Authors:
 [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1368023
Alternate Identifier(s):
OSTI ID: 1241397
Report Number(s):
LLNL-JRNL-680074
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 3; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; Toroidal plasma confinement; Divertors; Plasma convection; Plasma motion; Fluid equations

Citation Formats

Umansky, M. V., and Ryutov, D. D. Toroidally symmetric plasma vortex at tokamak divertor null point. United States: N. p., 2016. Web. doi:10.1063/1.4943101.
Umansky, M. V., & Ryutov, D. D. Toroidally symmetric plasma vortex at tokamak divertor null point. United States. doi:10.1063/1.4943101.
Umansky, M. V., and Ryutov, D. D. Wed . "Toroidally symmetric plasma vortex at tokamak divertor null point". United States. doi:10.1063/1.4943101. https://www.osti.gov/servlets/purl/1368023.
@article{osti_1368023,
title = {Toroidally symmetric plasma vortex at tokamak divertor null point},
author = {Umansky, M. V. and Ryutov, D. D.},
abstractNote = {Reduced MHD equations are used for studying toroidally symmetric plasma dynamics near the divertor null point. Numerical solution of these equations exhibits a plasma vortex localized at the null point with the time-evolution defined by interplay of the curvature drive, magnetic restoring force, and dissipation. Convective motion is easier to achieve for a second-order null (snowflake) divertor than for a regular x-point configuration, and the size of the convection zone in a snowflake configuration grows with plasma pressure at the null point. In conclusion, the trends in simulations are consistent with tokamak experiments which indicate the presence of enhanced transport at the null point.},
doi = {10.1063/1.4943101},
journal = {Physics of Plasmas},
number = 3,
volume = 23,
place = {United States},
year = {2016},
month = {3}
}

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Cited by: 3 works
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Works referenced in this record:

Geometrical properties of a “snowflake” divertor
journal, June 2007


Advanced divertor configurations with large flux expansion
journal, July 2013


Snowflake divertor plasmas on TCV
journal, March 2009


The ‘churning mode’ of plasma convection in the tokamak divertor region
journal, July 2014


A snowflake divertor: a possible solution to the power exhaust problem for tokamaks
journal, November 2012


Non-linear dynamics and pattern formation in a vertical fluid layer heated from the side
journal, December 2003

  • Bratsun, Dmitry A.; Zyuzgin, Alexej V.; Putin, Gennady F.
  • International Journal of Heat and Fluid Flow, Vol. 24, Issue 6
  • DOI: 10.1016/S0142-727X(03)00086-9

Reduced MHD in nearly potential magnetic fields
journal, January 1997


Ballooning modes localized near the null point of a divertor
journal, April 2014


Power exhaust in the snowflake divertor for L- and H-mode TCV tokamak plasmas
journal, February 2014


Enhanced $\boldsymbol{\vec{{E}}\times \vec{{B}}}$ drift effects in the TCV snowflake divertor
journal, November 2015


Special solutions of the Boussinesq-equations for free convection flows in a vertical gap
journal, July 2003


E×B circulation at the tokamak divertor X point
journal, May 2001

  • Schaffer, M. J.; Bray, B. D.; Boedo, J. A.
  • Physics of Plasmas, Vol. 8, Issue 5
  • DOI: 10.1063/1.1352597