Zobrazeno 1 - 10
of 532
pro vyhledávání: '"Caldas I"'
We introduce a second-order gyro-averaged extension to a guiding-center transport model for test particles subject to an $\mathbf{E}\times\mathbf{B}$ drift in a tokamak. Using this approximation, we numerically investigate the influence of finite Lar
Externí odkaz:
http://arxiv.org/abs/2407.15963
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 resilient to breakage under perturbation and therefore regions where they oc
Externí odkaz:
http://arxiv.org/abs/2406.19947
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 onset of these bifurcations, we consider a large aspect ratio tokamak
Externí odkaz:
http://arxiv.org/abs/2308.00810
Publikováno v:
Braz J Phys, 53, 96 (2023)
In tokamaks, modification of the plasma profiles can reduce plasma transport, improving particle confinement. However, this improvement is still not completely understood. In this work, we consider a drift wave test particle model to investigate the
Externí odkaz:
http://arxiv.org/abs/2306.00138
Autor:
Protachevicz, P. R., Borges, F. S., Batista, A. M., Baptista, M. S., Caldas, I. L., Macau, E. E. N., Lameu, E. L.
The brain is formed by cortical regions that are associated with different cognitive functions. Neurons within the same region are more likely to connect than neurons in distinct regions, making the brain network to have characteristics of a network
Externí odkaz:
http://arxiv.org/abs/2211.05644
Area-preserving nontwist maps are used to describe a broad range of physical systems. In those systems, the violation of the twist condition leads to nontwist characteristic phenomena, such as reconnection-collision sequences and shearless invariant
Externí odkaz:
http://arxiv.org/abs/2209.07408
Publikováno v:
Fundamental Plasma Physics, 6, 100023(2023)
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-like shaped radial electric field profile on the creation of shearless t
Externí odkaz:
http://arxiv.org/abs/2209.02374
Publikováno v:
Physics Letters A, 453, 128481 (2022)
Intrinsically coupled nonlinear systems present different oscillating components that exchange energy among themselves. A paradigmatic example is the spring pendulum, which displays spring, pendulum, and coupled oscillations. We analyze the energy ex
Externí odkaz:
http://arxiv.org/abs/2208.06390
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 the guiding-center trajectories of plasma particles undergoing ExB dr
Externí odkaz:
http://arxiv.org/abs/2207.02823
Publikováno v:
Physics of Plasmas, 28(8), 082305(2021)
Barriers have been identified in magnetically confined plasmas reducing the particle transport and improving the confinement. One of them, the primary shearless barriers are associated to extrema of non-monotonic plasma profiles. Previously, we ident
Externí odkaz:
http://arxiv.org/abs/2108.11143