Showing papers by "John R. Cary published in 1992"
TL;DR: In this paper, the authors show that the diffusion coefficient of a set of randomly phased waves can be enhanced by a factor of 2.5 at intermediate values of the overlap parameter.
Abstract: Velocity diffusion has been observed to be significantly above that given by quasilinear theory in both test‐particle and self‐consistent simulations of the dynamics of turbulent electrostatic fields. Test‐particle simulations and analytic calculations for motion in a set of randomly phased waves find the diffusion coefficient to be enhanced by a factor of 2.5 at intermediate values of the overlap parameter. Self‐consistent simulations find that the turbulent spectrum can evolve naturally into a form such that the diffusion enhancement is present when the linear growth time of the modes is long compared with the effective discretization time, which is nearly an order of magnitude greater than the resonant broadening time.
37 citations
TL;DR: A new adiabatic theory permits the understanding of one-dimensional dynamics of particles interacting with a large-amplitude wave packet for bounce time short compared with the transit time.
Abstract: A new adiabatic theory permits the understanding of one-dimensional dynamics of particles interacting with a large-amplitude wave packet for bounce time short compared with the transit time. This theory differs from previous ones in that the Hamiltonian varies slowly not with the time, but with the coordinate. The resulting adiabatic invariant is not equal, even in lowest order, to the usual action. This theory predicts the basic features of the interaction observed in previous numerical studies.
19 citations