The Hall dynamo effect and nonlinear mode coupling during sawtooth magnetic reconnection

W. X. Ding; D. L. Brower; B. H. Deng; A. F. Almagri; D. Craig; G. Fiksel; V. Mirnov; S. C. Prager; J. S. Sarff; V. Svidzinski

doi:10.1063/1.2363353

The Hall dynamo effect and nonlinear mode coupling during sawtooth magnetic reconnection

W. X. Ding, D. L. Brower, B. H. Deng, A. F. Almagri, D. Craig, G. Fiksel, V. Mirnov, S. C. Prager, J. S. Sarff, V. Svidzinski

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12 Scopus citations

Abstract

During magnetic reconnection associated with sawtooth activity in a reversed field pinch, we observe a large fluctuation-induced Hall electromotive force, 〈δJ×δB〉 ne e, which is capable of modifying the equilibrium current. This Hall dynamo effect is determined in the hot plasma core by laser Faraday rotation which measures equilibrium and fluctuating magnetic field and current density. We find that the Hall dynamo is strongest when nonlinear mode coupling between three spatial Fourier modes of the resistive tearing instability is present. Mode coupling alters the phase relation between magnetic and current density fluctuations for individual Fourier modes leading to a finite Hall effect. Detailed measurements of the spatial and temporal dynamics for the dominant core resonant mode under various plasma configurations are described providing evidence regarding the origin of the Hall dynamo.

Original language	English (US)
Article number	112306
Journal	Physics of Plasmas
Volume	13
Issue number	11
DOIs	https://doi.org/10.1063/1.2363353
State	Published - 2006

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.2363353

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@article{c94160ce567a4aa884b4fd701922b0dd,

title = "The Hall dynamo effect and nonlinear mode coupling during sawtooth magnetic reconnection",

abstract = "During magnetic reconnection associated with sawtooth activity in a reversed field pinch, we observe a large fluctuation-induced Hall electromotive force, 〈δJ×δB〉 ne e, which is capable of modifying the equilibrium current. This Hall dynamo effect is determined in the hot plasma core by laser Faraday rotation which measures equilibrium and fluctuating magnetic field and current density. We find that the Hall dynamo is strongest when nonlinear mode coupling between three spatial Fourier modes of the resistive tearing instability is present. Mode coupling alters the phase relation between magnetic and current density fluctuations for individual Fourier modes leading to a finite Hall effect. Detailed measurements of the spatial and temporal dynamics for the dominant core resonant mode under various plasma configurations are described providing evidence regarding the origin of the Hall dynamo.",

author = "Ding, {W. X.} and Brower, {D. L.} and Deng, {B. H.} and Almagri, {A. F.} and D. Craig and G. Fiksel and V. Mirnov and Prager, {S. C.} and Sarff, {J. S.} and V. Svidzinski",

note = "Funding Information: This work is supported by the U.S. Department of Energy and the National Science Foundation.",

year = "2006",

doi = "10.1063/1.2363353",

language = "English (US)",

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journal = "Physics of Plasmas",

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TY - JOUR

T1 - The Hall dynamo effect and nonlinear mode coupling during sawtooth magnetic reconnection

AU - Ding, W. X.

AU - Brower, D. L.

AU - Deng, B. H.

AU - Almagri, A. F.

AU - Craig, D.

AU - Fiksel, G.

AU - Mirnov, V.

AU - Prager, S. C.

AU - Sarff, J. S.

AU - Svidzinski, V.

N1 - Funding Information: This work is supported by the U.S. Department of Energy and the National Science Foundation.

PY - 2006

Y1 - 2006

N2 - During magnetic reconnection associated with sawtooth activity in a reversed field pinch, we observe a large fluctuation-induced Hall electromotive force, 〈δJ×δB〉 ne e, which is capable of modifying the equilibrium current. This Hall dynamo effect is determined in the hot plasma core by laser Faraday rotation which measures equilibrium and fluctuating magnetic field and current density. We find that the Hall dynamo is strongest when nonlinear mode coupling between three spatial Fourier modes of the resistive tearing instability is present. Mode coupling alters the phase relation between magnetic and current density fluctuations for individual Fourier modes leading to a finite Hall effect. Detailed measurements of the spatial and temporal dynamics for the dominant core resonant mode under various plasma configurations are described providing evidence regarding the origin of the Hall dynamo.

AB - During magnetic reconnection associated with sawtooth activity in a reversed field pinch, we observe a large fluctuation-induced Hall electromotive force, 〈δJ×δB〉 ne e, which is capable of modifying the equilibrium current. This Hall dynamo effect is determined in the hot plasma core by laser Faraday rotation which measures equilibrium and fluctuating magnetic field and current density. We find that the Hall dynamo is strongest when nonlinear mode coupling between three spatial Fourier modes of the resistive tearing instability is present. Mode coupling alters the phase relation between magnetic and current density fluctuations for individual Fourier modes leading to a finite Hall effect. Detailed measurements of the spatial and temporal dynamics for the dominant core resonant mode under various plasma configurations are described providing evidence regarding the origin of the Hall dynamo.

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DO - 10.1063/1.2363353

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VL - 13

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 11

M1 - 112306

ER -

The Hall dynamo effect and nonlinear mode coupling during sawtooth magnetic reconnection

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