Abstract
Low current vacuum arc discharge was investigated. Pulse source was the LC-line with quasi-rectangular pulse shape. Pulse durations were 2 and 3.5 microseconds. Discharge electrodes were made of copper and CuCr. Ion flow composition and ion energy spectra were obtained via the Thomson spectrometer with automated image recording and digital data processing. Entering of the ion flow to the spectrometer was partially limited by the electrostatic gate with variable duration and delay of the blocking pulse. Therefore the detection of ions depended on the ion velocity and the generation moment of the ion. It was found that the ion spectra have low energy (tens of eV) and high energy (hundreds of eV) parts. High energy ion fraction was sufficiently large, and the high energy ions were apparently generated at the discharge end at the given discharge parameters.
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