Authors

Fabrizio Consoli , Riccardo De Angelis, Lionel Duvillaret, Pierluigi Andreoli, Mattia Cipriani, Giuseppe Cristofari, Giorgio Di Giorgio, Francesco Ingenito

Abstract

The generation of radiofrequency-microwave electromagnetic-pulses (EMPs) by laser-plasma interaction in regimes relevant for inertial confinement fusion is a very important topic of research. The EMPs are transient electromagnetic fields observed for pulse duration from nanosecond up to femtosecond laser regimes and can create electric fields up to the MV/m, distributed manly within the experimental vacuum chamber. They have bandwidths of several GHz, duration up to hundreds of nanoseconds, and in many cases produce saturation and even damage to the electronic equipment within and nearby the experimental chamber. It is of primary importance to improve knowledge on EMPs for dealing with these problems on present and future plants for inertial-confinement-fusion and laser-plasma acceleration (NIF, LMJ, PETAL, ELI, Apollon…). Moreover, EMPs can supply information on the related laser-plasma interaction and their characterization can become an effective diagnostic tool. Measurement of EMPs presents many difficulties with classical metallic probes, which heavily suffer of effects due to ionizing radiation generated from laser-plasma and give only access to the time derivative of the field. For this reason we proposed an innovative electro-optical way for the measurement of the EMP electric fields in nanosecond laser-plasma interaction by means of Pockels effect on crystals [1], which has been recently applied successfully to the petawatt regime on experiments with Vulcan picosecond laser [2]. In this work we will present results obtained by electro-optic measurements in experiments of nanosecond laser-plasma interaction at intensities of 1014-1015 W/cm2 for l = 1054 nm and we will compare them with those achieved by classical metallic probes. The study indicates that signals are related with the emission of charged particles from target and that anisotropic particle emission, X-ray photoionization and charge implantation on surfaces exposed to plasma can be important EMP contributions.(a)

Reference

Scientific Reports 6, 27889, 2016

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