Abstract
Radioactive ignitors using tritium as the active material are shown to be a reliable electron priming source for the RF discharge gap in plasma limiters when cascaded with a diode limiter. This result is based on ion-chamber studies of priming current strength, electron distributions, and thermodynamic and chemical stability of titanium-tritide electron sources immersed in low-pressure gases. The results of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">X</tex> -band measurements of the statistical distribution of output spike leakage amplitudes for overvolted discharge gaps and the threshold of breakdown of the RF gap in tuned plasma limiters containing titanium-tritide ignitors followed by a diode limiter show operating parameters equivalent to keep-alive plasma limiters. Experiments with the tritiated passive priming source substituted for the conventional dc keep-alive discharge show a greatly increased operating life in receiver protectors and gaseous TR's and the improvement of other important electrical parameters such as noise, reliability, and external driving power.
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