Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of keV hot near-solid density plasma states at high contrast
  laser-matter interaction   We present experimental evidence of ultra-high energy density plasma states
with the keV bulk electron temperatures and near-solid electron densities
generated during the interaction of high contrast, relativistically intense
laser pulses with planar metallic foils. The bulk electron temperature and
density have been measured using x-ray spectroscopy tools; the temperature of
supra-thermal electrons traversing the target was determined from measured
bremsstrahlung spectra; run-away electrons were detected using magnet
spectrometers. The measured electron energy distribution was in a good
agreement with results of Particle-in-Cell (PIC) simulations. Analysis of the
bremsstrahlung spectra and results on measurements of the run-away electrons
showed a suppression of the hot electrons production in the case of the high
laser contrast. By application of Ti-foils covered with nm-thin Fe-layers we
demonstrated that the thickness of the created keV hot dense plasma does not
exceed 150 nm. Results of the pilot hydro-dynamic simulations that are based on
a wide-range two-temperature EOS, wide-range description of all transport and
optical properties, ionization, electron and radiative heating, plasma
expansion, and Maxwell equations (with a wide-range permittivity) for
description of the laser absorption are in excellent agreement with
experimental results. According to these simulations, the generation of keV-hot
bulk electrons is caused by the collisional mechanism of the laser pulse
absorption in plasmas with a near solid step-like electron density profile. The
laser energy firstly deposited into the nm-thin skin-layer is then transported
into the target depth by the electron heat conductivity. This scenario is
opposite to the volumetric character of the energy deposition produced by
supra-thermal electrons.

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The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: eess