skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Turbulence-driven anisotropic electron tail generation during magnetic reconnection

Abstract

Magnetic reconnection (MR) plays an important role in particle transport, energization, and acceleration in space, astrophysical, and laboratory plasmas. In the Madison Symmetric Torus reversed field pinch, discrete MR events release large amounts of energy from the equilibrium magnetic field, a fraction of which is transferred to electrons and ions. Previous experiments revealed an anisotropic electron tail that favors the perpendicular direction and is symmetric in the parallel. New profile measurements of x-ray emission show that the tail distribution is localized near the magnetic axis, consistent modeling of the bremsstrahlung emission. The tail appears first near the magnetic axis and then spreads radially, and the dynamics in the anisotropy and diffusion are discussed. The data presented imply that the electron tail formation likely results from a turbulent wave-particle interaction and provides evidence that high energy electrons are escaping the core-localized region through pitch angle scattering into the parallel direction, followed by stochastic parallel transport to the plasma edge. Finally, new measurements also show a strong correlation between high energy x-ray measurements and tearing mode dynamics, suggesting that the coupling between core and edge tearing modes is essential for energetic electron tail formation.

Authors:
 [1];  [1];  [1]; ORCiD logo [1];  [1];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Science Foundation (NSF)
OSTI Identifier:
1524585
Alternate Identifier(s):
OSTI ID: 1425714
Grant/Contract Number:  
FC02-05ER54814; PHY08-21899
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; 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

Citation Formats

DuBois, A. M., Scherer, A., Almagri, A. F., Anderson, J. K., Pandya, M. D., and Sarff, J. S. Turbulence-driven anisotropic electron tail generation during magnetic reconnection. United States: N. p., 2018. Web. doi:10.1063/1.5016240.
DuBois, A. M., Scherer, A., Almagri, A. F., Anderson, J. K., Pandya, M. D., & Sarff, J. S. Turbulence-driven anisotropic electron tail generation during magnetic reconnection. United States. doi:10.1063/1.5016240.
DuBois, A. M., Scherer, A., Almagri, A. F., Anderson, J. K., Pandya, M. D., and Sarff, J. S. Tue . "Turbulence-driven anisotropic electron tail generation during magnetic reconnection". United States. doi:10.1063/1.5016240. https://www.osti.gov/servlets/purl/1524585.
@article{osti_1524585,
title = {Turbulence-driven anisotropic electron tail generation during magnetic reconnection},
author = {DuBois, A. M. and Scherer, A. and Almagri, A. F. and Anderson, J. K. and Pandya, M. D. and Sarff, J. S.},
abstractNote = {Magnetic reconnection (MR) plays an important role in particle transport, energization, and acceleration in space, astrophysical, and laboratory plasmas. In the Madison Symmetric Torus reversed field pinch, discrete MR events release large amounts of energy from the equilibrium magnetic field, a fraction of which is transferred to electrons and ions. Previous experiments revealed an anisotropic electron tail that favors the perpendicular direction and is symmetric in the parallel. New profile measurements of x-ray emission show that the tail distribution is localized near the magnetic axis, consistent modeling of the bremsstrahlung emission. The tail appears first near the magnetic axis and then spreads radially, and the dynamics in the anisotropy and diffusion are discussed. The data presented imply that the electron tail formation likely results from a turbulent wave-particle interaction and provides evidence that high energy electrons are escaping the core-localized region through pitch angle scattering into the parallel direction, followed by stochastic parallel transport to the plasma edge. Finally, new measurements also show a strong correlation between high energy x-ray measurements and tearing mode dynamics, suggesting that the coupling between core and edge tearing modes is essential for energetic electron tail formation.},
doi = {10.1063/1.5016240},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Evidence for Electron Acceleration up to 300 k e V in the Magnetic Reconnection Diffusion Region of Earth’s Magnetotail
journal, October 2002


Particle Acceleration in the Magnetotail and Aurora
journal, April 2012


A loop-top hard X-ray source in a compact solar flare as evidence for magnetic reconnection
journal, October 1994

  • Masuda, S.; Kosugi, T.; Hara, H.
  • Nature, Vol. 371, Issue 6497
  • DOI: 10.1038/371495a0

First results from the Madison Symmetric Torus reversed field pinch
journal, June 1990

  • Prager, S. C.; Almagri, A. F.; Assadi, S.
  • Physics of Fluids B: Plasma Physics, Vol. 2, Issue 6
  • DOI: 10.1063/1.859557

Electron energization and transport in the magnetotail during substorms: Electron energization and transport
journal, February 2014

  • Pan, Qingjiang; Ashour-Abdalla, Maha; Walker, Raymond J.
  • Journal of Geophysical Research: Space Physics, Vol. 119, Issue 2
  • DOI: 10.1002/2013JA019508

Anisotropic Electron Tail Generation during Tearing Mode Magnetic Reconnection
journal, February 2017


Measurement of radial profile of the x‐ray emission on the JFT‐2M tokamak
journal, August 1988

  • Kawashima, H.; Matoba, T.
  • Review of Scientific Instruments, Vol. 59, Issue 8
  • DOI: 10.1063/1.1140069

Laboratory study of diffusion region with electron energization during high guide field reconnection
journal, October 2015

  • Yamasaki, K.; Inoue, S.; Kamio, S.
  • Physics of Plasmas, Vol. 22, Issue 10
  • DOI: 10.1063/1.4932345

The Madison Symmetric Torus
journal, January 1991

  • Dexter, R. N.; Kerst, D. W.; Lovell, T. W.
  • Fusion Technology, Vol. 19, Issue 1
  • DOI: 10.13182/FST91-A29322

A new soft x-ray pulse height analysis array in the HL-2A tokamak
journal, December 2009

  • Zhang, Y. P.; Liu, Yi; Yang, J. W.
  • Review of Scientific Instruments, Vol. 80, Issue 12
  • DOI: 10.1063/1.3263910

Suprathermal electron acceleration in magnetic reconnection
journal, November 2001

  • Hoshino, M.; Mukai, T.; Terasawa, T.
  • Journal of Geophysical Research: Space Physics, Vol. 106, Issue A11
  • DOI: 10.1029/2001JA900052

Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch
journal, May 2008

  • Gangadhara, S.; Craig, D.; Ennis, D. A.
  • Physics of Plasmas, Vol. 15, Issue 5
  • DOI: 10.1063/1.2884038

An upgraded x-ray spectroscopy diagnostic on MST
journal, October 2010

  • Clayton, D. J.; Almagri, A. F.; Burke, D. R.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3478977

Anomalous impurity ion heating from Alfvénic cascade in the reversed field pinch
journal, November 2008

  • Tangri, Varun; Terry, P. W.; Fiksel, Gennady
  • Physics of Plasmas, Vol. 15, Issue 11
  • DOI: 10.1063/1.2998829

Spatially Resolved Measurements of Ion Heating during Impulsive Reconnection in the Madison Symmetric Torus
journal, February 2007


Conversion of magnetic energy in the magnetic reconnection layer of a laboratory plasma
journal, September 2014

  • Yamada, Masaaki; Yoo, Jongsoo; Jara-Almonte, Jonathan
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms5774

Generation of suprathermal electrons during sawtooth crashes in a tokamak plasma
journal, February 2007


High-resolution time-resolved extreme ultraviolet spectroscopy on NSTX
journal, October 2012

  • Lepson, J. K.; Beiersdorfer, P.; Clementson, J.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4731753

Anisotropic Ion Heating and Tail Generation during Tearing Mode Magnetic Reconnection in a High-Temperature Plasma
journal, August 2011


Strong electron heating and non-Maxwellian behavior in magnetic reconnection
journal, June 2001

  • Hoshino, M.; Hiraide, K.; Mukai, T.
  • Earth, Planets and Space, Vol. 53, Issue 6
  • DOI: 10.1186/BF03353282

Runaway electron measurements in the JET tokamak
journal, December 1996

  • Esposito, B.; Solis, R. Martin; Belle, P. van
  • Plasma Physics and Controlled Fusion, Vol. 38, Issue 12
  • DOI: 10.1088/0741-3335/38/12/001

Localized electron heating by strong guide-field magnetic reconnection
journal, October 2015

  • Guo, Xuehan; Inomoto, Michiaki; Sugawara, Takumichi
  • Physics of Plasmas, Vol. 22, Issue 10
  • DOI: 10.1063/1.4932339

Mass-Dependent Ion Heating during Magnetic Reconnection in a Laboratory Plasma
journal, September 2009


Measurements of the nonthermal x-ray emission in the T-10 tokamak using CdTe detectors
journal, December 2002

  • Savrukhin, P. V.
  • Review of Scientific Instruments, Vol. 73, Issue 12
  • DOI: 10.1063/1.1519938

Electron Heat Transport Measured in a Stochastic Magnetic Field
journal, July 2003


Ion heating and magnetohydrodynamic dynamo fluctuations in the reversed-field pinch
journal, April 1992


Experimental Evidence for a Reduction in Electron Thermal Diffusion due to Trapped Particles
journal, October 2011


Spatially distributed scintillator arrays for diagnosing runaway electron transport and energy behavior in tokamaks
journal, October 2010

  • James, A. N.; Hollmann, E. M.; Tynan, G. R.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3475710

Hard x-ray diagnostic for lower hybrid experiments on Alcator C-Mod
journal, October 2006

  • Liptac, J.; Parker, R.; Tang, V.
  • Review of Scientific Instruments, Vol. 77, Issue 10
  • DOI: 10.1063/1.2214695

Charge-to-mass-ratio-dependent ion heating during magnetic reconnection in the MST RFP
journal, May 2013

  • Kumar, S. T. A.; Almagri, A. F.; Craig, D.
  • Physics of Plasmas, Vol. 20, Issue 5
  • DOI: 10.1063/1.4804958

Soft X-ray Emission Observation during Magnetic Reconnection in Spherical Tokamak Merging [球状トカマク合体時の磁気リコネクションにおける軟X線放射の観測]
journal, January 2014

  • Ushiki, Tomohiko; Inomoto, Michiaki; Koguchi, Haruhisa
  • IEEJ Transactions on Fundamentals and Materials, Vol. 134, Issue 9
  • DOI: 10.1541/ieejfms.134.493

10?100 keV electron acceleration and emission from solar flares
journal, April 1971


Angular distribution of the bremsstrahlung emission during lower hybrid current drive on PLT
journal, November 1985


A high time resolution x-ray diagnostic on the Madison Symmetric Torus
journal, July 2015

  • DuBois, Ami M.; Lee, John David; Almagri, Abdulgadar F.
  • Review of Scientific Instruments, Vol. 86, Issue 7
  • DOI: 10.1063/1.4927454

Electron and Ion Runaway in a Fully Ionized Gas. I
journal, July 1959


Runaway of energetic test ions in a toroidal plasma
journal, February 2015

  • Eilerman, S.; Anderson, J. K.; Sarff, J. S.
  • Physics of Plasmas, Vol. 22, Issue 2
  • DOI: 10.1063/1.4907662