a gas distributing system placed under anode in a volume, which is {HEAD ~ a subject} of {TAIL ~ 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 
a gas distributing system placed under anode in a volume , which is { HEAD ~ a subject } of { TAIL ~ 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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