Surface Aging in High Repetition Rate Spark Switches with Aluminum and Brass Electrodes
NAVAL SURFACE WEAPONS CENTER DAHLGREN VA
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The surface aging of the electrodes of miniature spark switches Ad 50 is explored using commercial dry nitrogen as the working gas. Both brass and aluminum electrodes were investigated for aging characteristics using a constant gas flow rate of 8 cm3sec. The gas pressure was varied from 760 torr-5200 torr. The switches were constructed as an integral part of a miniature L-C oscillator which has a ringing frequency of approximately 150 MHz. The aging process was halted at intervals ranging from one to several thousand discharges and the electrode surface examined with a scanning electron microscope.
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