Random and quasi-coherent aspects in particle motion and their effects on transport and turbulence evolution

M Vlad, F Spineanu - New Journal of Physics, 2017 - iopscience.iop.org
The quasi-coherent effects in two-dimensional incompressible turbulence are analyzed
starting from the test particle trajectories. They can acquire coherent aspects when the …

Role of stochastic anisotropy and shear on magnetic field lines diffusion

M Negrea, I Petrisor, B Weyssow - Plasma Physics and …, 2007 - iopscience.iop.org
Anisotropy in the magnetic fluctuation spectrum (stochastic anisotropy) and magnetic shear
induce variations of global averaged quantities such as the running and the asymptotic …

Stochastic field-line wandering in magnetic turbulence with shear. II. Decorrelation trajectory method

M Negrea, I Petrisor, A Shalchi - Physics of Plasmas, 2017 - pubs.aip.org
We study the diffusion of magnetic field lines in turbulence with magnetic shear. In the first
part of the series, we developed a quasi-linear theory for this type of scenario. In this article …

[PDF][PDF] Generalized conditional symmetries, related solutions of the klein–gordon–fock equation with central symmetry

R Constantinescu - Rom. J. Phys, 2016 - inspirehep.net
The generalized conditional symmetry (GCS) method is applied to a specific case of the
Klein–Gordon–Fock (KGF) equation with central symmetry. We first investigate the …

Diffusion of stochastic magnetic field lines with average poloidal magnetic component

M Negrea - Plasma Physics and Controlled Fusion, 2019 - iopscience.iop.org
We study the diffusion of stochastic isotropic and anisotropic magnetic field lines in
turbulence with average poloidal magnetic field component. In the current work we employ …

[PDF][PDF] Some statistical features of particle dynamics in tokamak plasma

I Petrisor - Rom. J. Phys, 2016 - rjp.nipne.ro
In order to study the transport of charged particles (ions, electrons) or dust particles in
tokamak plasma, we have used the numerical simulations method based on the TURBO …

Trajectory statistics and turbulence evolution

M Vlad, F Spineanu - Chaos, Solitons & Fractals, 2015 - Elsevier
The aim of this paper is to understand the tendency to organization of the turbulence in two-
dimensional ideal fluids. A different perspective on vorticity separation and on the inverse …

Diffusion of ions in an electrostatic stochastic field and a space-dependent unperturbed magnetic field

M Negrea - Plasma Science and Technology, 2019 - iopscience.iop.org
We calculate the diffusion coefficients for ions moving in a prescribed electromagnetic field.
The field is considered to be a superposition of an electrostatic stochastic field and a space …

[PDF][PDF] Code details in calculation of diffusion coefficients using Decorrelation Trajectory Method

I Petrisor, M Negrea - Physics AUC, 2012 - cis01.central.ucv.ro
Code details in calculation of diffusion coefficients using Decorrelation Trajectory Method Page
1 Code details in calculation of diffusion coefficients using Decorrelation Trajectory Method I …

Test particles, test modes and drift turbulence

M Vlad, F Spineanu - AIP Conference Proceedings, 2008 - pubs.aip.org
Strong electrostatic turbulence in magnetically confined plasmas is characterized by
trapping or eddying of test particle trajectories produced by the E× B stochastic drift …