71 citations · 623 across the 48 of their papers we have counts for
49 papers
Shearless curve breakup in the biquadratic nontwist map
Gabriel C. Grime, Marisa Roberto, Ricardo L. Viana +2
Nontwist area-preserving maps violate the twist condition along shearless invariant curves, which act as transport barriers in phase space. Recently, some plasma models have presen…
Fractal and Wada escape basins in the chaotic particle drift motion in tokamaks
Leonardo C. Souza, Amanda C. Mathias, Iberê L. Caldas +2
The drift motion of particles in tokamaks provides valuable information on the turbulence-driven anomalous transport. One of the characteristic features of t…
Shaping the edge radial electric field to create shearless transport barriers in tokamaks
L. A. Osorio-Quiroga, M. Roberto, I. L. Caldas +2
In tokamak-confined plasmas, particle transport can be reduced by modifying the radial electric field. In this paper, we investigate the influence of both a well-like and a hill-li…
Shearless bifurcations in particle transport for reversed shear tokamaks
G. C. Grime, M. Roberto, R. L. Viana +2
Some internal transport barriers in tokamaks have been related to the vicinity of extrema of the plasma equilibrium profiles. This effect is numerically investigated by considering…
Diffusion transitions in a 2D periodic lattice
Matheus J. Lazarotto, Iberê L. Caldas, Yves Elskens
Spatial diffusion of particles in periodic potential models has provided a good framework for studying the role of chaos in global properties of classical systems. Here a bidimensi…
Time simulation of the nonlinear wave-particle interaction in meters long traveling-wave tubes
Damien F. G. Minenna, Khalil Aliane, Yves Elskens +4
We propose a multi-particle self-consistent Hamiltonian (derived from an N-body description) that is applicable for periodic structures such as traveling-wave tubes (TWTs), gyrotro…