Abstract
Line broadenings of He I 4471 and He II 4686 in the plasma generated in a Marshall type coaxial plasma gun are measured by a 340cm Ebert type spectrometer. According to the Doppler shift measurement, a plasma is accelerated for about 5μ sec after the initiation ofthe gun discharge, and it leaves the plasma gun, while an unaccelerated plasma remains in the plasma gun after then during the discharge. Most of the line broadening in He II 4686 is due to Doppler broadening, and the Stark broadening is negligible. The accelerated plasma from the gun gradually loses the perpendicular component of the velocity to the axis of the plasma gun as it travels.
