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Shaping effects on toroidal magnetohydrodynamic modes in the presence of plasma and wall resistivity
- Source :
- Physics of Plasmas. 25:012517
- Publication Year :
- 2018
- Publisher :
- AIP Publishing, 2018.
-
Abstract
- 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. It is shown that the optimal shaping with rotation typically coincides with transitions between tearing-dominated and wall-dominated mode behavior.
- Subjects :
- Physics
Resistive touchscreen
Toroid
Safety factor
Tokamak
Plasma
Mechanics
Condensed Matter Physics
Rotation
01 natural sciences
010305 fluids & plasmas
law.invention
Physics::Plasma Physics
law
Plasma shaping
Physics::Space Physics
0103 physical sciences
Magnetohydrodynamic drive
010306 general physics
Subjects
Details
- ISSN :
- 10897674 and 1070664X
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Physics of Plasmas
- Accession number :
- edsair.doi...........9ee2f3b92ad8638c35d8485dcea182a6
- Full Text :
- https://doi.org/10.1063/1.4991873