Electron thermal confinement in a partially stochastic magnetic structure
Abstract
Using a high-repetition-rate Thomson scattering diagnostic, we observe a peak in electron temperature $$T_e$$ coinciding with the location of a large magnetic island in the Madison Symmetric Torus. Magnetohydrodynamic modeling of this quasi-single helicity plasma indicates that smaller adjacent islands overlap with and destroy the large island flux surfaces. The estimated stochastic electron thermal conductivity (≈30 m2/s) is consistent with the conductivity inferred from the observed $$T_e$$ gradient and ohmic heating power. Island-shaped $$T_e$$ peaks can result from partially stochastic magnetic islands.
- Authors:
-
[1];
[3];
[3];
- Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Physics and Dept. of Engineering Physics
- Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Physics
- Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Engineering Physics
- Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1540167
- Alternate Identifier(s):
- OSTI ID: 1433045
- Grant/Contract Number:
- FC02-05ER54814
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 4; 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; physics
Citation Formats
Morton, L. A., Young, W. C., Hegna, C. C., Parke, E., Reusch, J. A., and Den Hartog, D. J. Electron thermal confinement in a partially stochastic magnetic structure. United States: N. p., 2018.
Web. doi:10.1063/1.5021893.
Morton, L. A., Young, W. C., Hegna, C. C., Parke, E., Reusch, J. A., & Den Hartog, D. J. Electron thermal confinement in a partially stochastic magnetic structure. United States. https://doi.org/10.1063/1.5021893
Morton, L. A., Young, W. C., Hegna, C. C., Parke, E., Reusch, J. A., and Den Hartog, D. J. Fri .
"Electron thermal confinement in a partially stochastic magnetic structure". United States. https://doi.org/10.1063/1.5021893. https://www.osti.gov/servlets/purl/1540167.
@article{osti_1540167,
title = {Electron thermal confinement in a partially stochastic magnetic structure},
author = {Morton, L. A. and Young, W. C. and Hegna, C. C. and Parke, E. and Reusch, J. A. and Den Hartog, D. J.},
abstractNote = {Using a high-repetition-rate Thomson scattering diagnostic, we observe a peak in electron temperature $T_e$ coinciding with the location of a large magnetic island in the Madison Symmetric Torus. Magnetohydrodynamic modeling of this quasi-single helicity plasma indicates that smaller adjacent islands overlap with and destroy the large island flux surfaces. The estimated stochastic electron thermal conductivity (≈30 m2/s) is consistent with the conductivity inferred from the observed $T_e$ gradient and ohmic heating power. Island-shaped $T_e$ peaks can result from partially stochastic magnetic islands.},
doi = {10.1063/1.5021893},
journal = {Physics of Plasmas},
number = 4,
volume = 25,
place = {United States},
year = {Fri Apr 13 00:00:00 EDT 2018},
month = {Fri Apr 13 00:00:00 EDT 2018}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 1 work
Citation information provided by
Web of Science
Web of Science
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:
High-repetition-rate pulse-burst laser for Thomson scattering on the MST reversed-field pinch
journal, November 2013
- Young, W. C.; Morton, L. A.; Parke, E.
- Journal of Instrumentation, Vol. 8, Issue 11
Temperature Contours and Ghost Surfaces for Chaotic Magnetic Fields
journal, March 2008
- Hudson, S. R.; Breslau, J.
- Physical Review Letters, Vol. 100, Issue 9
A quantitative account of electron energy transport in a National Spherical Tokamak Experiment plasma
journal, May 2008
- Wong, K. L.; Kaye, S.; Mikkelsen, D. R.
- Physics of Plasmas, Vol. 15, Issue 5
A new paradigm for RFP magnetic self-organization: results and challenges
journal, March 2007
- Martin, P.; Marrelli, L.; Alfier, A.
- Plasma Physics and Controlled Fusion, Vol. 49, Issue 5A
Quasi-Single-Helicity Reversed-Field-Pinch Plasmas
journal, August 2000
- Escande, D. F.; Martin, P.; Ortolani, S.
- Physical Review Letters, Vol. 85, Issue 8
2D image of local density and magnetic fluctuations from line-integrated interferometry-polarimetry measurements
journal, November 2014
- Lin, L.; Ding, W. X.; Brower, D. L.
- Review of Scientific Instruments, Vol. 85, Issue 11
Helical temperature perturbations associated with tearing modes in tokamak plasmas
journal, March 1995
- Fitzpatrick, Richard
- Physics of Plasmas, Vol. 2, Issue 3
The divertor program in stellarators
journal, October 2002
- K. nig, R.; Grigull, P.; McCormick, K.
- Plasma Physics and Controlled Fusion, Vol. 44, Issue 11
Summary of the Fifth Workshop on Stochasticity in Fusion Plasmas
journal, May 2012
- Schmitz, O.
- Nuclear Fusion, Vol. 52, Issue 5
Pulse-burst laser systems for fast Thomson scattering (invited)
journal, October 2010
- Den Hartog, D. J.; Ambuel, J. R.; Borchardt, M. T.
- Review of Scientific Instruments, Vol. 81, Issue 10
Strong transport reduction in the helical core of the reversed-field pinch
journal, November 2007
- Annibaldi, S. V.; Bonomo, F.; Pasqualotto, R.
- Physics of Plasmas, Vol. 14, Issue 11
Electron thermal transport within magnetic islands in the reversed-field pinch
journal, May 2010
- Stephens, H. D.; Den Hartog, D. J.; Hegna, C. C.
- Physics of Plasmas, Vol. 17, Issue 5
Effect of Heating on the Suppression of Tearing Modes in Tokamaks
journal, January 2007
- Classen, I. G. J.; Westerhof, E.; Domier, C. W.
- Physical Review Letters, Vol. 98, Issue 3
Modulation of Core Turbulent Density Fluctuations by Large-Scale Neoclassical Tearing Mode Islands in the DIII-D Tokamak
journal, May 2016
- Bardóczi, L.; Rhodes, T. L.; Carter, T. A.
- Physical Review Letters, Vol. 116, Issue 21
Conductive electron heat flow along an inhomogeneous magnetic field
journal, October 2003
- Held, E. D.; Callen, J. D.; Hegna, C. C.
- Physics of Plasmas, Vol. 10, Issue 10
Parallel heat transport in integrable and chaotic magnetic fields
journal, May 2012
- del-Castillo-Negrete, D.; Chacón, L.
- Physics of Plasmas, Vol. 19, Issue 5
Nonclassical Transport and Particle-Field Coupling: from Laboratory Plasmas to the Solar Wind
journal, March 2013
- Perrone, D.; Dendy, R. O.; Furno, I.
- Space Science Reviews, Vol. 178, Issue 2-4
Experimental investigation of electron temperature dynamics of helical states in the RFX-Mod reversed field pinch
journal, April 2013
- Franz, P.; Gobbin, M.; Marrelli, L.
- Nuclear Fusion, Vol. 53, Issue 5
Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak
journal, May 2016
- Bardóczi, L.; Rhodes, T. L.; Carter, T. A.
- Physics of Plasmas, Vol. 23, Issue 5
Initial operation of a pulse-burst laser system for high-repetition-rate Thomson scattering
journal, October 2010
- Harris, W. S.; Den Hartog, D. J.; Hurst, N. C.
- Review of Scientific Instruments, Vol. 81, Issue 10
Dynamo-free plasma in the reversed-field pinch: Advances in understanding the reversed-field pinch improved confinement mode
journal, May 2005
- Anderson, J. K.; Adney, J.; Almagri, A.
- Physics of Plasmas, Vol. 12, Issue 5
10kHz repetitive high-resolution TV Thomson scattering on TEXTOR: Design and performance (invited)
journal, October 2006
- van der Meiden, H. J.; Varshney, S. K.; Barth, C. J.
- Review of Scientific Instruments, Vol. 77, Issue 10
Electron Heat Transport Measured in a Stochastic Magnetic Field
journal, July 2003
- Biewer, T. M.; Forest, C. B.; Anderson, J. K.
- Physical Review Letters, Vol. 91, Issue 4
Thomson scattering at 250 kHz
journal, December 2015
- Young, W. C.; Hartog, D. J. Den
- Journal of Instrumentation, Vol. 10, Issue 12
Improved confinement with internal electron transport barriers in RFX-mod
journal, April 2009
- Carraro, L.; Alfier, A.; Bonomo, F.
- Nuclear Fusion, Vol. 49, Issue 5
Experimental Evidence for a Reduction in Electron Thermal Diffusion due to Trapped Particles
journal, October 2011
- Reusch, J. A.; Anderson, J. K.; Den Hartog, D. J.
- Physical Review Letters, Vol. 107, Issue 15
Experimental signatures of homoclinic tangles in poloidally diverted tokamaks
journal, January 2005
- Evans, T. E.; Roeder, R. K. W.; Carter, J. A.
- Journal of Physics: Conference Series, Vol. 7
Lagrangian Coherent Structures
journal, January 2015
- Haller, George
- Annual Review of Fluid Mechanics, Vol. 47, Issue 1
Tomographic imaging of resistive mode dynamics in the Madison Symmetric Torus reversed-field pinch
journal, January 2006
- Franz, P.; Marrelli, L.; Piovesan, P.
- Physics of Plasmas, Vol. 13, Issue 1
Spontaneous quasi single helicity regimes in EXTRAP T2R reversed-field pinch
journal, November 2007
- Frassinetti, L.; Brunsell, P. R.; Drake, J. R.
- Physics of Plasmas, Vol. 14, Issue 11
The influence of finite radial transport on the structure and evolution of m / n = 2/1 neoclassical tearing modes on MAST
journal, May 2012
- Snape, J. A.; Gibson, K. J.; O'Gorman, T.
- Plasma Physics and Controlled Fusion, Vol. 54, Issue 8
Internal magnetic field structure and parallel electric field profile evolution during the sawtooth cycle in MST
journal, October 2008
- Deng, B. H.; Ding, W. X.; Brower, D. L.
- Plasma Physics and Controlled Fusion, Vol. 50, Issue 11
Semi-implicit magnetohydrodynamic calculations
journal, June 1987
- Schnack, D. D.; Barnes, D. C.; Mikic, Z.
- Journal of Computational Physics, Vol. 70, Issue 2
Equilibrium reconstruction in the Madison Symmetric Torus reversed field pinch
journal, December 2003
- Anderson, J. K.; Forest, C. B.; Biewer, T. M.
- Nuclear Fusion, Vol. 44, Issue 1
Effect of resonant magnetic perturbations on three dimensional equilibria in the Madison Symmetric Torus reversed-field pinch
journal, March 2016
- Munaretto, S.; Chapman, B. E.; Nornberg, M. D.
- Physics of Plasmas, Vol. 23, Issue 5
Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary
journal, June 2004
- Evans, T. E.; Moyer, R. A.; Thomas, P. R.
- Physical Review Letters, Vol. 92, Issue 23
Analysis of the structure of neoclassical tearing modes in ASDEX Upgrade
journal, September 2001
- Meskat, J. P.; Zohm, H.; Gantenbein, G.
- Plasma Physics and Controlled Fusion, Vol. 43, Issue 10
Current profile redistribution driven by neutral beam injection in a reversed-field pinch
journal, May 2016
- Parke, E.; Anderson, J. K.; Brower, D. L.
- Physics of Plasmas, Vol. 23, Issue 5
Detection of magnetic barriers in a chaotic domain: first application of finite time Lyapunov exponent method to a magnetic confinement configuration
journal, July 2015
- Rubino, G.; Borgogno, D.; Veranda, M.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 8
Works referencing / citing this record:
First observation of plasma healing via helical equilibrium in tokamak disruptions
journal, July 2019
- Du, X. D.; Shafer, M. W.; Evans, T. E.
- Nuclear Fusion, Vol. 59, Issue 9