{HEAD ~ a gas distributing system} placed under {TAIL ~ anode} in a volume, which is a subject of electron penetration and photo ionization radiation, in a lower part of discharge channel, where a discharge channel length is larger than a discharge channel width, with ionizing gas supplying holes directed tangentially into a gas input area, so a gas vortex flow is established providing uniformly distributed working gas under and into anode area 
placed under
{ HEAD ~ a gas distributing system } placed under { TAIL ~ anode } in a volume , which is a subject of electron penetration and photo ionization radiation , in a lower part of discharge channel , where a discharge channel length is larger than a discharge channel width , with ionizing gas supplying holes directed tangentially into a gas input area , so a gas vortex flow is established providing uniformly distributed working gas under and into anode area
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