Schematic diagram of the experimental setup. The inset is a 1-cm long alumina (Al2O3) tube.
Photograph (a) and the scheme (b) of the capillary with the electrode.
Temporal waveforms of the discharge voltage (a) and the current (b), respectively.
(a) The radial profile of the electron density, measured at the capillary exit (blue) and obtained in MHD simulation (red). (b) Time-integrated spectrum of the visible emission from the plasma jet.
The distribution in plane of electron density (a) in units of 1018 cm−3, electron temperature (b) in units of eV, and ion charge state (c), respectively. The scales show values of electron density, electron temperature, and ion charge state, respectively.
Simulated temporal evolution of the axial electron density , ion and electron temperatures and , mean degree of ionization of argon plasma , and the full electric current in the discharge.
Simulated radial profiles of electron density , ion and electron temperatures and , and mean degree of ionization of argon plasma at ns.
Photographs of the transmitted laser profile at the capillary exit for different moments of time and the fitted discharge current (solid line). The fitted current profile was used in the MHD simulation.
Experimental (blue) and obtained in PIC simulation (red) time-integrated spectra of the laser pulse at the entrance (a) and the exit (b) of the capillary with the preformed plasma at the delay time of 150 ns.
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