Fast gas heating and radial distribution of active species in nanosecond capillary discharge in pure nitrogen and N₂:O₂ mixtures

N D Lepikhin , N.A. Popov , Svetlana Starikovskaia (1)

1 LPP - Laboratoire de Physique des Plasmas

Fast gas heating is studied experimentally and numerically using pulsed nanosecond capillary discharge in pure nitrogen and N2:O2 mixtures under the conditions of high specific deposited energy (up to 1 eV/molecule) and high reduced electric fields (100–300 Td). Deposited energy, electric field and gas temperature are measured as functions of time. The radial distribution of active species is analyzed experimentally. The roles of processes involving excited N2 molecules and ions and N(2D) excited nitrogen species leading to heat release are analyzed using numerical modeling in the framework of 1D axial approximation.

Domaines: Physique des plasmas [physics.plasm-ph]

N D Lepikhin, N.A. Popov, Svetlana Starikovskaia. Fast gas heating and radial distribution of active species in nanosecond capillary discharge in pure nitrogen and N₂:O₂ mixtures. Plasma Sources Science and Technology, 2018, 27, pp.055005. ⟨10.1088/1361-6595/aab74e⟩. ⟨hal-01895560⟩