Spectroscopic Measurements of the Plasma from a Plasma Gun, (I)

概要

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Line broadening of He I 4471 ?? and He II 4686 ?? radiated from plasma generated in a Marshall type coaxial plasma gun are measured by a 340 cm Ebert type spectrometer. Doppler shift measurements indicates that a plasma blob is accelerated during about 5μsec from the initiation of gun discharge and leaves the plasma gun, while an unaccelerated plasma remains in the gun throughout the discharge period. Most of the line broadening on the He if 4686 ?? is due to Doppler broadening, and Stark broadening is negligible. The accelerated plasma from the gun gradually loses the velocity component perpendicular to the axis of the plasma gun as it travels through the vacuum vessel.
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