Entity

Time filter

Source Type

Santiago, Chile

Correa N.,University of Santiago de Chile | Chuaqui H.,University of Santiago de Chile | Wyndham E.,University of Santiago de Chile | Veloso F.,CCHEN | And 3 more authors.
Journal of Physics: Conference Series | Year: 2014

The design and calibration of an optical current sensor using BK7 glass is presented. The current sensor is based on the polarization rotation by Faraday effect. GEPOPU is a pulsed power generator, double transit time 120ns, 1.5 Ohm impedance, coaxial geometry, where Z pinch experiment are performed. The measurements were performed at the Optics and Plasma Physics Laboratory of Pontificia Universidad Catolica de Chile. The verdet constant for two different optical materials was obtained using He-Ne laser. The values obtained are within the experimental error bars of measurements published in the literature (less than 15% difference). Two different sensor geometries were tried. We present the preliminary results for one of the geometries. The values obtained for the current agree within the measurement error with those obtained by means of a Spice simulation of the generator. Signal traces obtained are completely noise free. Source


Marquez A.,CNEA and Instituto Balseiro | Gonzlez J.,CONICET | Tarifeno-Saldivia A.,CCHEN | Pavez C.,CCHEN | And 2 more authors.
Physics of Plasmas | Year: 2012

Using MHD theory, coupled differential equations were generated using a lumped parameter model to describe the internal behaviour of the pinch compression phase in plasma focus discharges. In order to provide these equations with appropriate initial conditions, the modelling of previous phases was included by describing the plasma sheath as planar shockwaves. The equations were solved numerically, and the results were contrasted against experimental measurements performed on the device PF-50J. The model is able to predict satisfactorily the timing and the radial electron density profile at the maximum compression. © 2012 American Institute of Physics. Source


Marquez A.,Instituto Balseiro | Gonzalez J.,CONICET | Tarifeo A.,CCHEN | Pavez C.,CCHEN | And 2 more authors.
Journal of Physics: Conference Series | Year: 2014

In this work, a model of the plasma dynamics was developed for a Plasma Focus device. Using MHD theory, coupled differential equations were generated to describe the macroscopic behaviour of pinch compression phase. In order to provide these equations with appropriate initial conditions, the modelling of previous phases was included by describing the plasma sheath as planar shockwaves. The equations were solved numerically and the results were contrasted against experimental measurements performed on the device PF-50, in order to evaluate the model's capability of predicting focus conditions at the time of maximum compression. Pinch dimensions and radial electron density profile were satisfactorily adjusted. Source


Casanova F.,CONICET | Tarifeno-Saldivia A.,CCHEN | Tarifeno-Saldivia A.,Center for Research and Applications in Plasma Physics and Pulsed Power | Veloso F.,CCHEN | And 6 more authors.
Journal of Fusion Energy | Year: 2012

A toroidal singularity in the current sheet of a Plasma Focus operated at tens of joules (PF-50J) leading to the formation of a high-density singularity on the plasma sheath was observed on interferographic images of discharges in 6 mbar of Deuterium gas. The phenomenon was numerically simulated by means of the 2D numerical code Cshock, which was able to reproduce the plasma kinetics and the evolution of the electrical variables, as well as the formation, movement and density of the plasmoid structure. © 2011 Springer Science+Business Media, LLC. Source


Casanova F.,CONICET | Tarifeno A.,CCHEN | Veloso F.,CCHEN | Soto L.,CCHEN | Clausse A.,CONICET
Journal of Physics: Conference Series | Year: 2014

A comparison between numerical simulations of discharges in the Plasma Focus device PF-50J using the code Cshock is presented. The code was able to reproduce kinetics and circuit parameter experimental measurements as well as the particular current sheath instability observed in this specific device. Source

Discover hidden collaborations