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A new type of plasma light source using amorphous filaments formed on ferrite substrates has been developed for application to gas laser excitation and preionization. A formed filament acts as a leading guide to produce a long-distance, high-current discharge plasma which emits hard ultraviolet photons. The plasma production mechanism and technological advantages over conventional ways of producing plasmas of the formed-ferrite flash are described.

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This article reports the observation of intense x-ray emission by a nonequilibrium energetic electron flow that can be produced when an explosive formed-ferrite filament is used as a plasma initiator in a high vacuum of 10−5–10−3 Torr. Exposure dose measurements and pinhole photographs for the x-ray emission have shown that x rays originate linearly along a 14.5-cm filament with a high exposure dose level of 50 mR(mili-roentgen)/pulse at 6.5 keV, the predominant x-ray energy. The x-ray emission characteristics are described in terms of the time-resolved and -integrated observations in order to infer the x-ray emission mechanism in which an interaction between energetic electron flow and a cloud of ions or neutral atoms thermally produced from the filament has to be taken into account in the close vicinity of the filament.

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