4 papers · 1 filter
Relaxed plasma equilibria and entropy-related plasma self-organization principles
R. L. Dewar, M. J. Hole, M. McGann +2
The concept of plasma relaxation as a constrained energy minimization is reviewed. Recent work by the authors on generalizing this approach to partially relaxed three-dimensional p…
Bifurcation in electrostatic resistive drift wave turbulence
Ryusuke Numata, Rowena Ball, Robert L. Dewar
The Hasegawa-Wakatani equations, coupling plasma density and electrostatic potential through an approximation to the physics of parallel electron motions, are a simple model that d…
Quantum chaos theory and the spectrum of ideal-MHD instabilities in toroidal plasmas
R. L. Dewar, C. Nuehrenberg, T. Tatsuno
In a fully 3-D system such as a stellarator, the toroidal mode number ceases to be a good quantum number--all s within a given mode family being coupled. It is found that th…
A walk in the parameter space of L-H transitions without stepping on or through the cracks
Rowena Ball, Robert L. Dewar
A mathematically and physically sound three-degree-of-freedom dynamical model that emulates low- to high-confinement mode (L--H) transitions is elicited from a singularity theory c…