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Title: Intrinsic flow and tearing mode rotation in the RFP during improved confinement

Abstract

We use charge exchange recombination spectroscopy to make the first localized measurements of impurity ion flow velocity profiles in the reversed field pinch. Measurements in improved confinement plasmas reveal an intrinsic flow profile that is peaked on the axis and mostly parallel to the equilibrium magnetic field. The toroidal flow decreases in time at off-axis locations where tearing modes are resonant, giving rise to a highly sheared flow profile near the axis. The tearing mode phase velocity correlates strongly with toroidal flow near the resonant surface and weakly with flow in other locations, providing an opportunity to verify the commonly held assumption that the plasma and mode move together at the resonant surface. Mechanisms for the observed momentum loss during the improved confinement period are evaluated, and it is found that eddy currents in the conducting shell caused by the rotation of the dominant tearing mode dominate over other losses.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2];  [2]
+ Show Author Affiliations
  1. Wheaton College, Wheaton, IL (United States). Dept. of Physics
  2. Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics
Publication Date:
Research Org.:
Wheaton College, Wheaton, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1560812
Alternate Identifier(s):
OSTI ID: 1544463
Grant/Contract Number:  
FC02-05ER54814
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 7; 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

Craig, D., Tan, E. H., Schott, B., Anderson, J. K., Boguski, J., Den Hartog, D. J., Nishizawa, T., Nornberg, M. D., and Xing, Z. A. Intrinsic flow and tearing mode rotation in the RFP during improved confinement. United States: N. p., 2019. Web. doi:10.1063/1.5095620.
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Craig, D., Tan, E. H., Schott, B., Anderson, J. K., Boguski, J., Den Hartog, D. J., Nishizawa, T., Nornberg, M. D., & Xing, Z. A. Intrinsic flow and tearing mode rotation in the RFP during improved confinement. United States. https://doi.org/10.1063/1.5095620
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Craig, D., Tan, E. H., Schott, B., Anderson, J. K., Boguski, J., Den Hartog, D. J., Nishizawa, T., Nornberg, M. D., and Xing, Z. A. Mon . "Intrinsic flow and tearing mode rotation in the RFP during improved confinement". United States. https://doi.org/10.1063/1.5095620. https://www.osti.gov/servlets/purl/1560812.
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@article{osti_1560812,
title = {Intrinsic flow and tearing mode rotation in the RFP during improved confinement},
author = {Craig, D. and Tan, E. H. and Schott, B. and Anderson, J. K. and Boguski, J. and Den Hartog, D. J. and Nishizawa, T. and Nornberg, M. D. and Xing, Z. A.},
abstractNote = {We use charge exchange recombination spectroscopy to make the first localized measurements of impurity ion flow velocity profiles in the reversed field pinch. Measurements in improved confinement plasmas reveal an intrinsic flow profile that is peaked on the axis and mostly parallel to the equilibrium magnetic field. The toroidal flow decreases in time at off-axis locations where tearing modes are resonant, giving rise to a highly sheared flow profile near the axis. The tearing mode phase velocity correlates strongly with toroidal flow near the resonant surface and weakly with flow in other locations, providing an opportunity to verify the commonly held assumption that the plasma and mode move together at the resonant surface. Mechanisms for the observed momentum loss during the improved confinement period are evaluated, and it is found that eddy currents in the conducting shell caused by the rotation of the dominant tearing mode dominate over other losses.},
doi = {10.1063/1.5095620},
journal = {Physics of Plasmas},
number = 7,
volume = 26,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 2019},
month = {Mon Jul 01 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5095620
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Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Toroidal magnetic flux, (b) soft X-ray emission (arbitrary units), and (c) m=1, n=6 toroidal phase velocity are shown for a typical PPCD discharge. PPCD is active from 10 ms to 20 ms.
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