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Title: Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch

Abstract

Measurements of localized ion heating during magnetic reconnection in the Madison Symmetric Torus reversed field pinch [R. N. Dexter, D. W. Kerst, T. W. Lovell, S. C. Prager, and J. C. Sprott, Fusion Technol. 19, 131 (1991)] are presented using two beam-based diagnostics: Charge exchange recombination spectroscopy and Rutherford scattering. Data have been collected from three types of impulsive reconnection event, in which the resistive tearing mode activity associated with reconnection is present either in the edge plasma, the core plasma, or throughout the plasma volume. A drop in the stored magnetic energy is required for ion heating to be observed during magnetic reconnection, and when this occurs, heating is concentrated in regions where reconnection is taking place. The magnitude of the observed temperature rise during reconnection varies with ion species, suggesting that the heating mechanism has a mass and/or charge dependence. Both the magnitude and spatial structure of the observed temperature rise also depend on the plasma current and density. Nonetheless, the fraction of released magnetic energy converted to ion thermal energy remains roughly constant over a range of plasma conditions.

Authors:
; ; ; ;  [1];  [2];  [1];  [2]
  1. Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas, Princeton, New Jersey 08542 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
21120376
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 15; Journal Issue: 5; Other Information: DOI: 10.1063/1.2884038; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAMS; CHARGE EXCHANGE; ELECTRIC CURRENTS; IONS; MAGNETIC RECONNECTION; PLASMA; PLASMA DIAGNOSTICS; PLASMA HEATING; REVERSE-FIELD PINCH; REVERSED-FIELD PINCH DEVICES; RUTHERFORD BACKSCATTERING SPECTROSCOPY; RUTHERFORD SCATTERING; TEARING INSTABILITY

Citation Formats

Gangadhara, S., Ennis, D. A., Hartog, D. J. den, Fiksel, G., Prager, S. C., University of Wisconsin-Madison, Madison, Wisconsin 53706, Craig, D., and Wheaton College, Wheaton, Illinois 60187. Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch. United States: N. p., 2008. Web. doi:10.1063/1.2884038.
Gangadhara, S., Ennis, D. A., Hartog, D. J. den, Fiksel, G., Prager, S. C., University of Wisconsin-Madison, Madison, Wisconsin 53706, Craig, D., & Wheaton College, Wheaton, Illinois 60187. Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch. United States. doi:10.1063/1.2884038.
Gangadhara, S., Ennis, D. A., Hartog, D. J. den, Fiksel, G., Prager, S. C., University of Wisconsin-Madison, Madison, Wisconsin 53706, Craig, D., and Wheaton College, Wheaton, Illinois 60187. Thu . "Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch". United States. doi:10.1063/1.2884038.
@article{osti_21120376,
title = {Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch},
author = {Gangadhara, S. and Ennis, D. A. and Hartog, D. J. den and Fiksel, G. and Prager, S. C. and University of Wisconsin-Madison, Madison, Wisconsin 53706 and Craig, D. and Wheaton College, Wheaton, Illinois 60187},
abstractNote = {Measurements of localized ion heating during magnetic reconnection in the Madison Symmetric Torus reversed field pinch [R. N. Dexter, D. W. Kerst, T. W. Lovell, S. C. Prager, and J. C. Sprott, Fusion Technol. 19, 131 (1991)] are presented using two beam-based diagnostics: Charge exchange recombination spectroscopy and Rutherford scattering. Data have been collected from three types of impulsive reconnection event, in which the resistive tearing mode activity associated with reconnection is present either in the edge plasma, the core plasma, or throughout the plasma volume. A drop in the stored magnetic energy is required for ion heating to be observed during magnetic reconnection, and when this occurs, heating is concentrated in regions where reconnection is taking place. The magnitude of the observed temperature rise during reconnection varies with ion species, suggesting that the heating mechanism has a mass and/or charge dependence. Both the magnitude and spatial structure of the observed temperature rise also depend on the plasma current and density. Nonetheless, the fraction of released magnetic energy converted to ion thermal energy remains roughly constant over a range of plasma conditions.},
doi = {10.1063/1.2884038},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 15,
place = {United States},
year = {2008},
month = {5}
}