Current measurement by Faraday effect on GEPOPU

15th International Congress on Plasma Physics; 13th Latin American Workshop on Plasma Physics

Correa, N.^1 ; Chuaqui, H.^1 ; Wyndham, E.^1 ; Veloso, F.^2 ; Valenzuela, J.^1 ; Favre, M.^1 ; Bhuyan, H.^1

Departamento de Física, Pontifica Universidad Católica de Chile, Av. Vicuña Mackenna 4860, casilla 306 Santiago 22, Chile^1

Departamento de Plasmas Termonucleares, CCHEN, casilla 188-D, Santiago, Chile^2

关键词: Coaxial geometry;    Experimental errors;    Optical current sensor;    Polarization rotation;    Pulsed-power generators;    Sensor geometries;    SPICE simulations;    Verdet constant;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/511/1/012026/pdf
DOI  :  10.1088/1742-6596/511/1/012026

来源: IOP

【 摘 要 】

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.