Role of resistivity and viscosity in the excitation of stable m = 0 modes during the RFP sawtooth crash

Futch, A. M.; Craig, D.; Hesse, R.; Jacobson, C. M.

doi:10.1063/1.5054578

Title: Role of resistivity and viscosity in the excitation of stable m = 0 modes during the RFP sawtooth crash

Journal Article · 20 November 2018 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5054578 · OSTI ID:1609211

^[1]; Craig, D. ^[2];

^[2];

^[3]

Wheaton College, IL (United States); DOE/OSTI
Wheaton College, IL (United States)
Univ. of Wisconsin, Madison, WI (United States)

Visco-resistive magnetohydrodynamic simulations are used herein to investigate the role of resistivity and viscosity in the reversed field pinch sawtooth crash. Specifically, we examine the temporal behavior of the linearly stable ($m, n$) = (0, 1) mode. Both volume-averaged dissipation and dissipation levels in the region near the $$m$$ = 0 resonance are found to influence characteristic time scales. Increasing resistivity causes the mode rise time, fall time, and total crash duration to decrease, while increasing viscosity has the opposite effect. Examination of energy flow during the sawtooth crash reveals that despite the linear stability of the (0, 1) mode, it receives most of its energy from the mean current profile during the crash rather than from nonlinear interactions with other modes. Resistivity and viscosity do not impact mode behavior directly through dissipative energy loss but rather through modification of the large scale current profile evolution and radial structure of the mode. Computational results are compared to experimental data from the Madison Symmetric Torus and found to largely agree when resistivity and viscosity are similar.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-05ER54814

OSTI ID:: 1609211

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 25; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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