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A new electrode geometry, the stirrup, utilizes its own magnetic field to maintain a diffuse high-current vacuum arc at the centre of the electrode system. This arc is reproducible and stable, and the voltage is hash-free. High-speed photographs of a high-current vacuum arc are shown, together with arc voltage and current oscillograms and characteristics. A modification of the electrode is described giving hash-free arc voltages for peak currents up to at least 23 kA peak. Results for arcs between disc electrodes under similar conditions are also shown for comparison.
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Barrault et al. (1977) studied this question.
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