Abstract
Soft x-ray emission from a short vacuum gap, operated with a repetitive low-current arc with a period of ∼2 µs and peak current of 200 A, was investigated. Electrons are accelerated by an electric field in the cathode sheath that is formed after arc extinction, and soft x-rays were emitted in the period between arc extinction and subsequent breakdown. The bulk of the radiation was detected in the 1–3 keV soft x-ray range when a tungsten anode was employed. The dimension of the point-like x-ray source in the radial direction was less than 170 µm. The current density at the time of x-ray emission was ∼107 A m−2.
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