تصميم وتطوير منظومة مفتاح الشرارة الكاذبة لاستخدامها في بلازما ليزر بخار النحاس

Abstract

H.voltage switches are very important for using to drive high power lasers. Pseudo spark switch system was designed, its replace rather than high –power switch such as thyratron, and ordinary spark gap. Pseudo spark is another kind of electrical discharge of low gas (0.1-1) mbar yield in chamber has a special design. Pseudo spark switch was tested by using chamber contains special gas Ar in 0.1 mbar, the peak current 400A with rise time 20ns study the switching parameter of this system such as, recovery time ,jitter time, inductance, and the internal resistance during the break down case. Jitter time is ±10ns in the 15KV with frequency repetition about (1KHz).The pseudo spark switch was using drive the plasma tube of copper vapor laser and by this system get a best matching between discharge and charging circuit with out warms the system and compare the result with using thyratron at the same system .The trigger technique is surface discharge trigger, it is a thin copper disc beside the cathode, applied negative pulse (trigger pulse) 1KV, 04µs, there is no sensitive delay time between the main discharge and preionization discharge when the trigger applied at cathode .The life time of this system depends on the thickness, kind of insulation material in the main and trigger gap and the discharge parameter, specially the repetition frequency.