Abstract

We report experimental results on relativistic electron beam (REB) transport in a set of cold and shock-heated carbon samples using the high-intensity kilojoule-class OMEGA EP laser. The REB energy distribution and transport were diagnosed using an electron spectrometer and x-ray fluorescence measurements from a Cu tracer buried at the rear side of the samples. The measured rear REB density shows brighter and narrower signals when the targets were shock-heated. Hybrid PIC simulations using advanced resistivity models in the target warm-dense-matter (WDM) conditions confirm this observation. We show that the resistivity response of the media, which governs the self-generated resistive fields, is of paramount importance to understand and correctly predict the REB transport.

Highlights

  • When an intense laser pulse interacts with a dense target, a high-current relativistic electron beam (REB) is generated and driven into the target

  • Experimental setup The experiments were conducted at the OMEGA EP laser facility with a dual laser beam configuration in planar geometry: a high-energy UV long-pulse beam equipped with a distributed phase plate (DPP) for beam smoothing (LP: 4 ns, 3.3 kJ, 2 ́ 1014 W cm-2) was focused onto the rear surface of the target coated with 30 mm CH over a focal spot of 750 mm FWHM and launched a shock in the carbon sample; the high-intensity EP short-pulse beam (SP: 10 ps, 850 J, ~1019 W cm-2) was focused on the opposite side of the target and generated a REB in the shock-heated target at varying delays Δt with respect to the LP-laser

  • We present in each successive column the results at the REB injection delays explored during the experiment, both for vitreous carbon and diamond samples

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Summary

Introduction

When an intense laser pulse interacts with a dense (opaque) target, a high-current relativistic electron beam (REB) is generated and driven into the target. The transport of intense current (>1 MA) of REB into dense matter is of critical importance for various applications such as secondary sources of energetic particles [6] and radiation [7, 8], and for isochoric heating of matter to temperatures relevant to the study of structural and dynamic properties of warm dense matter or high-energy-density (HED) matter [9,10,11,12,13,14]. It is of significant importance to understand the underlying physics of REB transport through the WDM region, and control its propagation to a small radius

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