Abstract
The periodic fluctuations present in d.c. plasma jets in argon and nitrogen have been studied with a high-speed streak camera. An explanation for the nature of these fluctuations is given in terms of a process in which the are column is continuously lengthening and short-circuiting. The amplitude and frequency of this column process is dependent upon the power dissipated in the jet, while the different forms in argon and nitrogen can be attributed to the differing anode-root mechanisms in these gases. On the assumption that the suggested are column process occurs, the velocity of the jet has been deduced.
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