FIELD: laser equipment. SUBSTANCE: device has separate cathodes which have extended emitters which go outside of cathode housing. When potential difference between adjacent cathode is generated due to heterogeneity of gas in main discharge gap, probability of break down along gas between emitters is greater than along longer distance between housings of cathodes. This results in ignition of discharge between extensions of emitters. This discharge by-passes this potential difference and prevents space between electrodes against breakdown. EFFECT: increased reliability. 8 cl, 4 dwg
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