Shaping effects on toroidal magnetohydrodynamic modes in the presence of plasma and wall resistivity

Rhodes, Dov J.; Cole, A. J.; Brennan, D. P.; Finn, J. M.; Li, M.; Fitzpatrick, R.; Mauel, M. E.; Navratil, G. A.

doi:10.1063/1.4991873

Shaping effects on toroidal magnetohydrodynamic modes in the presence of plasma and wall resistivity

Journal Article · Wed Jan 31 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4991873· OSTI ID:1523263

Rhodes, Dov J. ^[1]; Cole, A. J. ^[2]; Brennan, D. P. ^[3]; Finn, J. M. ^[4]; ^[3]; ^[5]; ^[2]; ^[2]

Columbia Univ., New York, NY (United States); none
Columbia Univ., New York, NY (United States)
Princeton Univ., Princeton, NJ (United States)
Tibbar Plasma Technologies Inc., Los Alamos, NM (United States)
Univ. of Texas at Austin, Austin, TX (United States)

This study explores the effects of plasma shaping on magnetohydrodynamic mode stability and rotational stabilization in a tokamak, including both plasma and wall resistivity. Depending upon the plasma shape, safety factor, and distance from the wall, the β-limit for rotational stabilization is given by either the resistive-plasma ideal-wall (tearing mode) limit or the ideal-plasma resistive-wall (resistive wall mode) limit. In order to explore this broad parameter space, a sharp-boundary model is developed with a realistic geometry, resonant tearing surfaces, and a resistive wall. The β-limit achievable in the presence of stabilization by rigid plasma rotation, or by an equivalent feedback control with imaginary normal-field gain, is shown to peak at specific values of elongation and triangularity. As a result, it is shown that the optimal shaping with rotation typically coincides with transitions between tearing-dominated and wall-dominated mode behavior

View Accepted Manuscript (DOE)

Research Organization:: Columbia Univ., New York, NY (United States); Princeton Univ., Princeton, NJ (United States); Univ. of Texas at Austin, Austin, TX (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER54742; FG02-86ER53222; SC0014005; SC0014119

OSTI ID:: 1523263

Alternate ID(s):: OSTI ID: 1418892

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 25; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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