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Title: Evidence for drift waves in the turbulence of reversed field pinch plasmas

Authors:
 [1];  [2];  [2];  [2]
  1. Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA, Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706, USA, Department of Physics, Washington College, 300 Washington Avenue, Chestertown, Maryland 21620, USA
  2. Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA, Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1349356
Grant/Contract Number:
FC02-05ER54814
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 2; Related Information: CHORUS Timestamp: 2018-02-14 12:23:11; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Thuecks, D. J., Almagri, A. F., Sarff, J. S., and Terry, P. W.. Evidence for drift waves in the turbulence of reversed field pinch plasmas. United States: N. p., 2017. Web. doi:10.1063/1.4976838.
Thuecks, D. J., Almagri, A. F., Sarff, J. S., & Terry, P. W.. Evidence for drift waves in the turbulence of reversed field pinch plasmas. United States. doi:10.1063/1.4976838.
Thuecks, D. J., Almagri, A. F., Sarff, J. S., and Terry, P. W.. Wed . "Evidence for drift waves in the turbulence of reversed field pinch plasmas". United States. doi:10.1063/1.4976838.
@article{osti_1349356,
title = {Evidence for drift waves in the turbulence of reversed field pinch plasmas},
author = {Thuecks, D. J. and Almagri, A. F. and Sarff, J. S. and Terry, P. W.},
abstractNote = {},
doi = {10.1063/1.4976838},
journal = {Physics of Plasmas},
number = 2,
volume = 24,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4976838

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

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  • Within the framework of magnetohydrodynamic (MHD) numerical modeling, the reversed field pinch (RFP) has been found to develop turbulent or laminar regimes switching from the former to the latter in a continuous way when the strength of dissipative forces increases. The laminar solution corresponds to a simple global helical deformation of the current channel and is associated with an electrostatic dynamo field. The related electrostatic drift yields the main component of the dynamo velocity field. While quite natural in the stationary helical state, this analysis is shown to extend also to the dynamic turbulent regime for an Ohmic RFP. Themore » continuity of the transition between the two regimes suggests that the simple helical symmetric solution can provide a fruitful intuitive description of the RFP dynamo in general. Many of the MHD predictions are in good agreement with experimental findings.« less
  • The statistical temporal properties of broadband magnetic turbulence in the edge of reversed field pinch (RFP) plasmas are significantly altered when global magnetohydrodynamic tearing modes and magnetic relaxation are reduced. Standard RFP plasmas, having relatively large tearing fluctuations, exhibit broadband intermittent bursts of magnetic fluctuations in the bandwidth f<1.5 MHz. When the global tearing is reduced via parallel current drive in the edge region, the magnetic turbulence is much less intermittent and has statistical behavior typical of self-similar turbulence (like that expected in self-organized criticality systems). A connection between intermittency and long wavelength plasma instabilities is therefore implied.
  • Turbulence in the reversed field pinch (RFP) plasma has been investigated by using the microwave imaging reflectometry in the toroidal pinch experiment RX (TPE-RX). In conventional RFP plasma, the fluctuations are dominated by the intermittent blob-like structures. These structures are accompanied with the generation of magnetic field, the strong turbulence, and high nonlinear coupling among the high and low k modes. The pulsed poloidal current drive operation, which improves the plasma confinement significantly, suppresses the dynamo, the turbulence, and the blob-like structures.