Temporal evolution of plasma from a highly ionized helium capillary discharge
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Emission spectroscopy was used to study the temporal evolution of a highly ionized helium plasma generated in a 1-mm-diameter capillary by a fast (90-ns full width at half-maximum (FWHM)) discharge pulse. The time dependence of the plasma density was measured from the Stark broadened line profile of the HeII 468.5-nm transition. A 1.2-kA discharge current pulse was observed to create a plasma density of 8 × 1016 cm-3 in 1 torr of helium. The maximum intensity of HeII transitions occurs in the afterglow of the discharge pulse, following the collisional recombination of totally stripped ions with ...