Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Vlad, Madalina"'
This paper is focused on the coherent effects that appear in tracer statistics in two-dimensional incompressible turbulence in the presence of an average velocity. We show that this determines strong modifications of the transport and trajectory stat
Externí odkaz:
http://arxiv.org/abs/2306.07639
Autor:
Spineanu, Florin, Vlad, Madalina
We discuss a possible perspective on the process of transition from the layer of sheared poloidal rotation in the H-mode to a set of discrete filaments that concentrate vorticity and current density. They may be precursors of the Edge Localized Modes
Externí odkaz:
http://arxiv.org/abs/2011.11782
A process specific to the dynamics of the heavy impurities in turbulent tokamak plasmas is found and analysed. We show that the parallel stochastic acceleration is strongly coupled to the perpendicular transport and generates a radial pinch velocity.
Externí odkaz:
http://arxiv.org/abs/2008.10948
Autor:
Vlad, Madalina, Spineanu, Florin
The paper defines and discusses the concept of hidden drifts in two-dimensional turbulence. These are ordered components of the trajectories that average to zero and do not produce direct transport. Their effects appear in the evolution of the turbul
Externí odkaz:
http://arxiv.org/abs/1803.01793
Autor:
Spineanu, Florin, Vlad, Madalina
Fundamental Lagrangian, frozen-in and topological invariants can be useful to explain systematic connections between plasma parameters. At high plasma temperature the dissipation is small and the robust invariances are manifested. We invoke a frozen-
Externí odkaz:
http://arxiv.org/abs/1512.04730
Autor:
Vlad, Madalina, Spineanu, Florin
The effects of the resonant magnetic perturbations (RMPs) on the turbulent transport are analyzed in the framework of the test particle approach using a semi-analytical method. The normalized RMP amplitude $P_{b}$ extends on a large range, from the p
Externí odkaz:
http://arxiv.org/abs/1512.00722
Autor:
Spineanu, Florin, Vlad, Madalina
At incident powers much higher than the threshold for filamentation a pulse from a high-power laser generates in the transversal plane a complex structure. It consists of randomly meandering stripes defining connected regions where the field intensit
Externí odkaz:
http://arxiv.org/abs/1506.04245
Autor:
Spineanu, Florin, Vlad, Madalina
The ideal incompressible fluid in two dimensions (Euler fluid) evolves at relaxation from turbulent states to highly coherent states of flow. For the case of double spatial periodicity and zero total vorticity it is known that the streamfunction veri
Externí odkaz:
http://arxiv.org/abs/1312.6613
Autor:
Spineanu, Florin, Vlad, Madalina
The large scale atmospheric vortices (tropical cyclones, tornadoes) are complex physical systems combining thermodynamics and fluid-mechanical processes. The well known tendency of vorticity to self-organization, an universal property of the two-dime
Externí odkaz:
http://arxiv.org/abs/1310.2750
Autor:
Spineanu, Florin, Vlad, Madalina
The connection between the poloidal and the toroidal rotation of plasma in tokamak is important for the high confinement regimes, in particular in reactor regime. The sudden onset of closed convection structures in the poloidal section, due to the ba
Externí odkaz:
http://arxiv.org/abs/1301.0892