Abstract

Plasma oscillations in the frequency range of 2 to 4 Gc/sec were observed with a radially directed probe in a tubular plasma column. The plasma oscillations, which are generated by application of a pulsed electric field at the plasma cathode or anode in an argon hot-cathode arc, are sustained for as long as 50 μsec after the pulsed field is removed. The oscillations occur near the crests of a moving striation. The plasma oscillations are associated with the striation and are most intense near the plasma anode. The frequency detected by the probe increases with increasing plasma density but is not related to the 300-G magnetic field which is applied parallel to the plasma column. The oscillations may be the result of the two-stream interaction of the plasma electrons with a group of high energy electrons associated with the striation.

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