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Title: M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations

Abstract

Non-axisymmetric control coils and the so-called snow ake divertor con guration are two potential solutions proposed to solve two separate outstanding issues on the path towards self-sustained burning plasma operations, namely the transient energy bursts caused by edge localized modes and the steady state heat exhaust problem. In a reactor, these two proposed solutions would have to operate simultaneously and it is, therefore, important to investigate their compatibility and to identify possible con icts that could prevent them from operating simultaneously. In this work, single- and two- uid resistive magnetohydrodynamic calculations are used to investigate the e ect of externally applied n = 3 magnetic perturbations on the snow ake divertor con guration. The calculations are performed using the code M3D-C1 and are based on simulated NSTX-U plasmas. The results show that additional and longer magnetic lobes are created in the null-point region of the snow ake con guration, compared to those in the conventional single-null. The intersection of these longer and additional lobes with the divertor plates are expected to cause more striations in the particle and heat ux target pro les. In addition, the results indicate that the size of the magnetic lobes, in both single-null and snowmore » ake con gurations, are more sensitive to resonant magnetic perturbations than to non-resonant magnetic perturbations. The results also suggest that lower values of current in nonaxisymmetric control coils closer to the null-point region would be required to suppress edge localized modes. This e ect is expected to be enhanced in plasmas with the snow ake con guration.« less

Authors:
 [1];  [2];  [3];  [3];  [2];  [4];  [2];  [4];  [5];  [6];  [6];  [7];  [6];  [8]
  1. General Atomics, San Diego, CA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. General Atomics, San Diego, CA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Sao Paulo (Brazil). Dept. of Applied Physics
  6. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  8. Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1373377
Alternate Identifier(s):
OSTI ID: 1374813; OSTI ID: 1376338; OSTI ID: 1771442
Report Number(s):
LLNL-JRNL-820478
Journal ID: ISSN 0029-5515
Grant/Contract Number:  
SC0012706; FC02-04ER54698; AC05-06OR23100; AC02-09CH11466; AC05-00OR22725; SC0012315; SC0013911; AC52-07NA27344; SC0008520
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 7; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; snowflake divertor; RMP; plasma response; two-fluid MHD

Citation Formats

Canal, G. P., Ferraro, N. M., Evans, T. E., Osborne, T. H., Menard, J. E., Ahn, J. -W., Maingi, R., Wingen, A., Ciro, D., Frerichs, H., Schmitz, O., Soukhanoviskii, V., Waters, I., and Sabbagh, S. A.. M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations. United States: N. p., 2017. Web. doi:10.1088/1741-4326/aa6e10.
Canal, G. P., Ferraro, N. M., Evans, T. E., Osborne, T. H., Menard, J. E., Ahn, J. -W., Maingi, R., Wingen, A., Ciro, D., Frerichs, H., Schmitz, O., Soukhanoviskii, V., Waters, I., & Sabbagh, S. A.. M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations. United States. https://doi.org/10.1088/1741-4326/aa6e10
Canal, G. P., Ferraro, N. M., Evans, T. E., Osborne, T. H., Menard, J. E., Ahn, J. -W., Maingi, R., Wingen, A., Ciro, D., Frerichs, H., Schmitz, O., Soukhanoviskii, V., Waters, I., and Sabbagh, S. A.. Thu . "M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations". United States. https://doi.org/10.1088/1741-4326/aa6e10. https://www.osti.gov/servlets/purl/1373377.
@article{osti_1373377,
title = {M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations},
author = {Canal, G. P. and Ferraro, N. M. and Evans, T. E. and Osborne, T. H. and Menard, J. E. and Ahn, J. -W. and Maingi, R. and Wingen, A. and Ciro, D. and Frerichs, H. and Schmitz, O. and Soukhanoviskii, V. and Waters, I. and Sabbagh, S. A.},
abstractNote = {Non-axisymmetric control coils and the so-called snow ake divertor con guration are two potential solutions proposed to solve two separate outstanding issues on the path towards self-sustained burning plasma operations, namely the transient energy bursts caused by edge localized modes and the steady state heat exhaust problem. In a reactor, these two proposed solutions would have to operate simultaneously and it is, therefore, important to investigate their compatibility and to identify possible con icts that could prevent them from operating simultaneously. In this work, single- and two- uid resistive magnetohydrodynamic calculations are used to investigate the e ect of externally applied n = 3 magnetic perturbations on the snow ake divertor con guration. The calculations are performed using the code M3D-C1 and are based on simulated NSTX-U plasmas. The results show that additional and longer magnetic lobes are created in the null-point region of the snow ake con guration, compared to those in the conventional single-null. The intersection of these longer and additional lobes with the divertor plates are expected to cause more striations in the particle and heat ux target pro les. In addition, the results indicate that the size of the magnetic lobes, in both single-null and snow ake con gurations, are more sensitive to resonant magnetic perturbations than to non-resonant magnetic perturbations. The results also suggest that lower values of current in nonaxisymmetric control coils closer to the null-point region would be required to suppress edge localized modes. This e ect is expected to be enhanced in plasmas with the snow ake con guration.},
doi = {10.1088/1741-4326/aa6e10},
journal = {Nuclear Fusion},
number = 7,
volume = 57,
place = {United States},
year = {Thu Apr 20 00:00:00 EDT 2017},
month = {Thu Apr 20 00:00:00 EDT 2017}
}

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Works referenced in this record:

Magnetohydrodynamic stability of tokamak edge plasmas
journal, July 1998

  • Connor, J. W.; Hastie, R. J.; Wilson, H. R.
  • Physics of Plasmas, Vol. 5, Issue 7
  • DOI: 10.1063/1.872956

Modification of high mode pedestal instabilities in the DIII-D tokamak
journal, May 2000

  • Ferron, J. R.; Chu, M. S.; Jackson, G. L.
  • Physics of Plasmas, Vol. 7, Issue 5
  • DOI: 10.1063/1.874053

Characterization of peeling–ballooning stability limits on the pedestal
journal, April 2004

  • Snyder, P. B.; Wilson, H. R.; Osborne, T. H.
  • Plasma Physics and Controlled Fusion, Vol. 46, Issue 5A
  • DOI: 10.1088/0741-3335/46/5A/014

Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER
journal, August 2003


Resonant magnetic perturbations of edge-plasmas in toroidal confinement devices
journal, November 2015


On the physics guidelines for a tokamak DEMO
journal, June 2013


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


Snowflake divertor plasmas on TCV
journal, March 2009


“Snowflake” divertor configuration in NSTX
journal, August 2011


Snowflake divertor configuration studies in National Spherical Torus Experiment
journal, August 2012

  • Soukhanovskii, V. A.; Bell, R. E.; Diallo, A.
  • Physics of Plasmas, Vol. 19, Issue 8
  • DOI: 10.1063/1.4737117

Advanced divertor configurations with large flux expansion
journal, July 2013


Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER
journal, August 2013


Experimental divertor physics
journal, June 1997


Power distribution in the snowflake divertor in TCV
journal, November 2013


First EMC3-Eirene simulations of the TCV snowflake divertor
journal, February 2014


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


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


Corrigendum: The ‘churning mode’ of plasma convection in the tokamak divertor region (2014 Phys. Scr. 89 088002)
journal, August 2015


The snowflake divertor
journal, November 2015

  • Ryutov, D. D.; Soukhanovskii, V. A.
  • Physics of Plasmas, Vol. 22, Issue 11
  • DOI: 10.1063/1.4935115

Ideal and resistive edge stability calculations with M3D-C1
journal, October 2010

  • Ferraro, N. M.; Jardin, S. C.; Snyder, P. B.
  • Physics of Plasmas, Vol. 17, Issue 10
  • DOI: 10.1063/1.3492727

A triangular finite element with first-derivative continuity applied to fusion MHD applications
journal, October 2004


Investigation of resistive wall mode stabilization physics in high-beta plasmas using applied non-axisymmetric fields in NSTX
journal, August 2007


Modelling of stochastic magnetic perturbation by RWMEF coils on NSTX
journal, August 2006


Calculations of two-fluid linear response to non-axisymmetric fields in tokamaks
journal, May 2012


Study of in-vessel nonaxisymmetric ELM suppression coil concepts for ITER
journal, January 2008


Theory and observations of magnetic islands
journal, September 2009


Quasi-linear MHD modelling of H-mode plasma response to resonant magnetic perturbations
journal, February 2010


Experimental signatures of homoclinic tangles in poloidally diverted tokamaks
journal, January 2005


Resonance processes in magnetic traps
journal, January 1960

  • Chirikov, B. V.
  • Journal of Nuclear Energy. Part C, Plasma Physics, Accelerators, Thermonuclear Research, Vol. 1, Issue 4
  • DOI: 10.1088/0368-3281/1/4/311

On description of magnetic stochasticity in poloidal divertor tokamaks
journal, January 2008

  • Abdullaev, S. S.; Jakubowski, M.; Lehnen, M.
  • Physics of Plasmas, Vol. 15, Issue 4
  • DOI: 10.1063/1.2907163

Modeling of stochastic magnetic flux loss from the edge of a poloidally diverted tokamak
journal, December 2002

  • Evans, T. E.; Moyer, R. A.; Monat, P.
  • Physics of Plasmas, Vol. 9, Issue 12
  • DOI: 10.1063/1.1521125

High resolution numerical studies of separatrix splitting due to non-axisymmetric perturbation in DIII-D
journal, April 2009


Local measurements of screening currents driven by applied RMPs on TEXTOR
journal, May 2014


Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
journal, June 2016

  • Frerichs, H.; Schmitz, O.; Waters, I.
  • Physics of Plasmas, Vol. 23, Issue 6, Article No. 062517
  • DOI: 10.1063/1.4954816