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
Summary
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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