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The laser system PALS, as a driver of a broad-beam ion source, delivered deuterons which generated neutrons with energies higher than 14 MeV through the $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}{}^{7}\mathrm{Li(d,n)}{}^{8}\mathrm{Be}$ reaction. Deuterons with sub-MeV energy were accelerated from the front surface of a massive $\mathrm{CD}_{2}$ target in the backward direction with respect to the laser beam vector. Simultaneously, neutrons were emitted from the primary $\mathrm{CD}_{2}$ target and a secondary LiF catcher. The total maximum measured neutron yield from ${}^{2}\mathrm{D(d,n)}{}^{3}\mathrm{He}$, ${}^{7}\mathrm{Li(d,n)}{}^{8}\mathrm{Be}$, ${}^{12}\mathrm{C(d,n)}{}^{13}\mathrm{N}$ reactions was ${\sim } 3.5 ({\pm }0.5) \times 10^{8}\ \mathrm{neutrons/shot}$.
A space-resolved charge density of ions is derived from a time-resolved current of ions emitted from laser-produced plasma and expanded into the vacuum along collision-free and field-free paths. This derivation is based on a similarity relationship for ion currents with “frozen” charges observed at different distances from the target. This relationship makes it possible to determine a map of ion charge density at selected times after the laser plasma interaction from signals of time-of-flight detectors positioned at a certain distance from the target around a target-surface normal. In this work, we present maps of the charge density of ions emitted from Cu and polyethylene plasmas. The mapping demonstrates that bursts of ions are emitted at various ejection angles ϕn with respect to the target-surface normal. There are two basic directions ϕ1 and ϕ2, one belonging to the fastest ions, i.e., protons and carbon ions, and the other one to the slowest ions being a part of each plasma plume.
The Prague Asterix Laser System (PALS) research program covers a broad
spectrum of laser–plasma experiments in the range of power densities
of 1014-5 × 1016 W/cm2, aimed
at development and applications of laser plasma-based ion and soft X-ray
sources of plasma based ultra-bright XUV lasers in particular. In parallel
to these two main lines of research, various principal tasks of laser
plasma physics are being studied, such as generation and propagation of
laser-induced shock waves, laser ablation, and crater creation processes
or laser imprint treatment. Results selected of numerous experimental
projects performed at PALS within the period 2002–2004 are surveyed
in the paper, experiments with intense soft XUV laser beams being
highlighted on the first place.
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