Abstract
A spectral investigation of low-current DC vacuum arc voltage is presented. High-speed streak photographs of cathode-spot light emission with high time resolution were obtained and are discussed. Characteristic frequencies of cathode-spot instabilities are derived from average frequency spectra of the arc voltage.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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