arXiv subjects

Julio Puerta

Publications and source records attributed to Julio Puerta.

2 recordsLinked to original sources

arXiv2004

Marginal Confinement in Tokamaks by Inductive Electric Field

Here diffusion and Ware pinch are analyzed as opposed effects for plasma confinement, when instabilities are not considered. In this work it is studied the equilibrium inductive electric field where both effects annul each other in the sense that the average normal velocity is zero, that is, marginal velocity confinement is reached. The critical electric field defined in that way is studied for different values of elliptic elongation, Shafranov shift and triangularity. A short complementary analysis is also performed of the variation of the poloidal magnetic field along a magnetic line. Magnetohydrodynamic transport theory in the collisional regime is used as in recent publications. Axisymmetric and up-down symmetry are assumed

physics.plasm-ph↗

arXiv2004

Analysis of the Drift Instability Growth Rates in Non-Ideal inhomogeneous Dusty Plasmas

In this paper we introduce an algebraic form of the dispersion relation for a non ideal inhomogeneous dusty plasma in order to improve drastically the calculation of the drift instability growth rate. This method makes use of the multipole approximation of the Z dispersion function, previously published, and valid for the entire range. A careful analysis of the solutions spectra of this kind of polynomial equation permits us to calculate easily the growth rate of the drift instability for the ion-dust and dust acoustic mode. The value of the parallel to magnetic field wavelength for which the instability reaches the maximal value is carefully localized and discussed. The unstable dust-ion and dust acoustic mode are discriminated and analyzed in function of the density gradient, Te/Ti - ratio, and dust grain radius.

physics.plasm-ph↗