Abstract
Line broadening of He I 4471 A and He ‖ 4686 A 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 5 μsec from the initiation of gun discharge and leaves the plasma gun, while an unacceleratee 1 plasma remains in the gun throughout the discharge period. Most of the line broadening on the He ‖ 4686 A 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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