Review of the Critical Velocity of Gas-Plasma Interaction. I: Experimental Observations

Details Review of the Critical Velocity of Gas-Plasma Interaction. I: Experimental Observations Review of the Critical Velocity of Gas-Plasma Interaction. I: Experimental Observations

Oct 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..24..459d&link_type=abstract

Astrophysics and Space Science, Volume 24, Issue 2, pp.459-485

Astronomy and Astrophysics

Astrophysics

34

Scientific paper

A review is given of the experimental investigations concerning the critical velocity of the interaction between a neutral gas and a plasma in relative motion. In most of the experiments this critical velocity is equivalent to a voltage limitation of a discharge through a partially ionized magnetized plasma. The critical velocity phenomenon can have been of importance in a large number of experiments but it has been observed in rather few cases and studied in detail in less than half a dozen plasma machines. The major investigations were made in rotating plasma devices like the Homopolar, plasma guns and a plasma-neutral gas impact experiment. The emphasis of this paper is concentrated, though not limited, to collision-free plasmas. Thus the (MPD-)arc experiments are not extensively treated. It is concluded that the existence, under certain conditions, of a critical velocity, critical voltage or critical E/B (depending on the particular observation) is proved by sufficient experimental evidence. In a following article in this issue by J. Sherman the theoretical work in the same field is discussed.

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