Abstract
The charge particle emission form laser-generated plasma was studied experimentally and theoretically using the COMSOL simulation code. The particle acceleration was investigated using two lasers at two different regimes. A Nd:YAG laser, with 3 ns pulse duration and 1010W/cm2intensity, when focused on solid target produces a non-equilibrium plasma with average temperature of about 30-50 eV. An Iodine laser with 300 ps pulse duration and 1016W/cm2intensity produces plasmas with average temperatures of the order of tens keV. In both cases charge separation occurs and ions and electrons are accelerated at energies of the order of 200 eV and 1 MeV per charge state in the two cases, respectively. The simulation program permits to plot the charge particle trajectories from plasma source in vacuum indicating how they can be deflected by magnetic and electrical fields. The simulation code can be employed to realize suitable permanent magnets and solenoids to deflect ions toward a secondary target or detectors, to focalize ions and electrons, to realize electron traps able to provide significant ion acceleration and to realize efficient spectrometers. In particular it was applied to the study two Thomson parabola spectrometers able to detect ions at low and at high laser intensities. The comparisons between measurements and simulation is presented and discussed.
Highlights
Laser Generated Plasma (LGP) in vacuum is a relevant topic in many scientific fields, due to its large number of applications, such as preparation of ion sources, ion acceleration method, production of nuclear reactions, generation of neutron emission [1, 2]
In this work we have considered three systems that use magnetic and electrical fields to study a non-equilibrium plasma generated by laser pulses: 1. Longitudinal Magnetic Field: consisting of a magnetic field having a symmetry axis parallel to the main plasma plume emission, and orthogonal to the irradiated target
We have emphasized the role of simulation programs, like COMSOL Multiphysics, which can be used in the analysis of the dynamics of a nonequilibrium plasma generated by high intensity laser pulses [3]
Summary
Laser Generated Plasma (LGP) in vacuum is a relevant topic in many scientific fields, due to its large number of applications, such as preparation of ion sources, ion acceleration method, production of nuclear reactions, generation of neutron emission [1, 2]. Magnetic fields can be applied to LGPs in order to focus the charged particles emitted from the irradiated target or to select particles with definited energy using longitudinal or transversal magnetic fields, respectively. These two cases are performed at the Plasma Physics Laboratory in Messina University, using permanent magnetic fields with maximum values of about 0.3 T. Magnetic fields can be employed to realize electron traps acting on the flux and on the energy of the plasma accelerated charged particles, according to the literature [4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
