TY CONF TI Probe diagnostics of abnormal glow discharge in pure conditions KW discharge KW cathode sheath KW probe measurements KW helium KW Townsend coefficient JO XVII International conference on pulsed lasers and laser applications – AMPL-2025 AU Bohan, P.A. AU Gugin, P.P. AU Lavruhin, M.A. AU Zakrevskiy, D.E. AU Shevchenko, G.V. PY 2025 PB V.E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences