Stabilization of line tied resistive wall kink modes with rotating walls

Hegna, C. C.

doi:doi:10.1063/1.1773777

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Relativistic quasilinear diffusion in axisymmetric magnetic geometry for arbitrary-frequency electromagnetic fluctuations

A relativistic bounce-averaged quasilinear diffusion equation is derived to describe stochastic particle transport associated with arbitrary-frequency electromagnetic fluctuations in a nonuniform magnetized plasma. Expressions for the elements of a relativistic quasilinear diffusion tensor are calculated explicitly for magnetically trapped particle distributions in axisymmetric magnetic geometry in terms of gyro-drift-bounce wave-particle resonances. The resonances can destroy any one of the thr...

Asymptotic freeze-out of the perturbations generated inside a corrugated rarefaction wave

Based on previous work [J. G. Wouchuk and R. Carretero, Phys. Plasmas 10, 4237 (2003)], the conditions of asymptotic freeze-out of the ripples at the tail of a corrugated rarefaction wave are analyzed. The precise location of the freezing-out regions in the space of preshock parameters is tried, and an efficient algorithm for their determination is given. It is seen that asymptotic freeze-out can only happen for gases that have an isentropic exponent γ<γcr ≈ 2.2913…. It is shown that the late...

A method suggested by Gimblett [ C. G. Gimblett, Plasma Phys. Controlled Fusion, 31 2183 (1989) ] for stabilizing resistive wall modes by using a rotating double wall configuration is applied to a line tied screw pinch equilibrium. The line tied boundary conditions provide an additional stabilizing mechanism relative to instabilities present in periodic cylinders that limits ideal kink instability to only be present when q_a<1 for m = 1 modes. With differentially rotating walls, resistive wall modes can be stabilized with q_a values less than unity. For a given equilibrium, there exists an optimal spacing between a stationary and a rotating wall that minimizes the critical wall rotation frequency for stabilization.

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KEYWORDS and PACS

Keywords

kink instability, pinch effect, plasma boundary layers, plasma-wall interactions, plasma magnetohydrodynamics

PACS

52.35.Py

Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
52.55.Dy

General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.
52.30.-q

Plasma dynamics and flow