Electron temperature in a decaying krypton plasma in the presence of a low electric field |
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Authors: | N A Gorbunov N B Kolokolov F E Latyshev A S Mel’nikov |
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Institution: | (1) Research Institute of Physics, St. Petersburg State University, St. Petersburg, 198504, Russia |
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Abstract: | The influence of low electric fields on the average electron energy in an afterglow krypton plasma is studied by means of
probe diagnostics and theoretical analysis. It is shown that, when the average electron energy is lower than the energy corresponding
to the minimum scattering transport cross section, the degree of plasma ionization substantially affects the shape of the
electron energy distribution function (EEDF). The nonequlibrium character of the EEDF results in the density dependence of
the coefficient of ambipolar diffusion, which leads to a change in the radial profile of the charged particle density, an
increase in the drop in the ambipolar potential across the plasma, and an increase in the rate of diffusive plasma decay.
These effects substantially enhance the diffusive cooling of electrons, which is probably a decisive factor influencing the
electron energy balance in high-Z noble gases. |
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