A fully variational, unstructured, electromagnetic particle-in-cell integrator is developed for integration of the Vlasov-Maxwell equations. Using the formalism of Discrete Exterior Calculus [1], theâ€¦ (More)

Turbulence and dynamo induced by the magnetorotational instability (MRI) are analyzed using quasilinear statistical simulation methods. It is found that homogenous turbulence is unstable to aâ€¦ (More)

Physical review. E, Statistical, nonlinear, andâ€¦

2015

This article presents a calculation of the mean electromotive force arising from general small-scale magnetohydrodynamical turbulence, within the framework of the second-order correlationâ€¦ (More)

In the process of dissipative relaxation, there is strong astrophysical and laboratory evidence that plasmas tend to evolve towards the well-known Woltjer-Taylor state, specified by [nabla]Ã—B=Î±B forâ€¦ (More)

Nonhelical shear dynamos are studied with a particular focus on the possibility of coherent dynamo action. The primary resultsâ€”serving as a follow up to the results of Squire & Bhattacharjeeâ€”pertainâ€¦ (More)

We analyze the linear growth of the magnetorotational instability (MRI) in the short-time limit using nonmodal methods. Our findings are quite different from standard results, illustrating thatâ€¦ (More)

We propose a new mechanism for a turbulent mean-field dynamo in which the magnetic fluctuations resulting from a small-scale dynamo drive the generation of large-scale magnetic fields. This is inâ€¦ (More)

J. Squire1,3â€ and A. Bhattacharjee2,3 TAPIR, Mailcode 350-17, California Institute of Technology, Pasadena, CA 91125, USA Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory,â€¦ (More)