Abstract
Multigap pseudospark devices can be used to produce intense pulsed electron beams. Pseudospark discharge is generally initiated by self-breakdown or an external trigger in which DC high voltage is used. In this work, we investigated a pulse charge mode to generate an enhanced pulsed electron beam from a 10-gap pseudospark device. In the pulse charge mode, pulsed high voltage is applied to the device. Using the pulse charge mode, we could obtain enhanced electron beams in wider ranges of voltage and pressure than in the self-discharge or the trigger mode. We achived a maximum efficiency of enhanced electron beams at 3×10-1 mbar of Ar gas. Under this best pressure condition, we also observed well-focused electron beams with a diameter of down to 0.1 mm, peak current of up to 130 A, and full width at half maximum (FWHM) of 10 ns. The peak power density was 1010 W/cm2.
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