46 citations · 100 across the 11 of their papers we have counts for
11 papers
Larmor radius effect on the control of chaotic transport in tokamaks
L. A. Osorio-Quiroga, M. Roberto, R. L. Viana +2
We investigate the influence of the finite Larmor radius on the dynamics of guiding-center test particles subjected to an drift in a large aspect-rat…
Shearless effective barriers to chaotic transport induced by even twin islands in nontwist systems
M. Mugnaine, J. D. Szezech, R. L. Viana +2
For several decades now it has been known that systems with shearless invariant tori, nontwist Hamiltonian systems, possess barriers to chaotic transport. These barriers are resili…
Isochronous island bifurcations driven by resonant magnetic perturbations in Tokamaks
B. B. Leal, I. L. Caldas, M. C. de Sousa +2
Recent evidences show that heteroclinic bifurcations in magnetic islands may be caused by the amplitude variation of resonant magnetic perturbations in tokamaks. To investigate the…
ExB drift particle transport in tokamaks
L. A. Osorio-Quiroga, G. C. Grime, M. Roberto +3
In tokamaks, modification of the plasma profiles can reduce plasma transport, improving particle confinement. However, this improvement is still not completely understood. In this…
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…
Onset of internal transport barriers in tokamaks
L. A. Osorio, M. Roberto, I. L. Caldas +2
Barriers have been identified in magnetically confined plasmas reducing the particle transport and improving the confinement. One of them, the primary shearless barriers are associ…
Transport barriers in symplectic maps
R. L. Viana, I. L. Caldas, J. D. Szezech +10
Chaotic transport is a subject of paramount importance in a variety of problems in plasma physics, specially those related to anomalous transport and turbulence. On the other hand,…
Super persistent transient in a master-slave configuration with Colpitts oscillators
R. C. Bonetti, S. L. T. de Souza, A. M. Batista +5
Master-slave systems have been intensively investigated to model the application of chaos to communications. We considered Colpitts oscillators coupled according to a master-slave…
Effective transport barriers in nontwist systems
J. D. Szezech, I. L. Caldas, S. R. Lopes +2
In fluids and plasmas with zonal flow reversed shear, a peculiar kind of transport barrier appears in the shearless region, one that is associated with a proper route of transition…
Turing instability in oscillator chains with non-local coupling
R. L. Viana, F. A. dos S. Silva, S. R. Lopes
We investigate analytically and numerically the conditions for the Turing instability to occur in a one-dimensional chain of nonlinear oscillators coupled non-locally in such a way…