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The simple physical model of highly charged ion generation in plasma produced by laser irradiation with long pulse duration (>1 ns) and moderate intensities (<1015/λ2 W/cm2μm2) is presented. In the frame of a single theory, most of the experimental results on plasma diagnostics are described in total. It is shown that plasma temperatures, ion charge states, and ion velocities as well as angular distributions of highly charged ions can be explained with good accuracy by collisional absorption of laser energy, hydrodynamic acceleration of forming plasma, and three-body recombination through highly exited levels during plasma expansion into vacuum. The general scalings for plasma parameters are derived on the basis of the model proposed.
The paper presents the first experimental results obtained by using
new gamma-quantum diagnostics for ion beam induced high energy density
matter. Registration of γ-quantum output from the region of
beam-target interaction with time resolution enables to pick-up
information on density evolution of the target even if the ionization
state of matter involved is unknown.
In this article, we present the results of the laser ion source
(LIS) for heavy ion high charge state Institute of Theoretical
and Experimental Physics terawatt accumulator facility. This
LIS is a duty ion source of C+4 for the injector.
The main parameters of CO2 laser, vacuum target chamber,
ion beam high voltage extraction system, and low energy beam
transport line are shown. The stability of the LIS operation
is discussed and measured ion beam parameters (ion current,
pulse duration, emittance) for different charge states are
presented. After the upgrading of the laser cavity, high voltage
capacitors, and spark gaps and the installation of a new catalyst
regenerator system, the CO2 laser became much more
stable and allows long term operation. LIS works about 1 ×
106 shots without intervention.
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