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Experiments Concerning Nonequilibrium Conductivity in a Seeded Plasma

Zukoski, E. E. and Cool, T. A. and Gibson, E.G. (1964) Experiments Concerning Nonequilibrium Conductivity in a Seeded Plasma. AIAA Journal, 2 (8). pp. 1410-1417. ISSN 0001-1452. doi:10.2514/3.2559.

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Measurements of conductivity have been made in a plasma composed of argon seeded with potassium vapor. The gas temperature was 2000°K; the pressure, 1 atm; and the potassium concentration was between 0.22 and 0.80 mole-percent. Conductivity values, calculated from a two-temperature model in which the energy dependence of the cross sections and radiation losses from the plasma are taken into account, agree well with experimental values. Measured values of the plasma temperature appear to be about 10% less than predicted values. Relaxation times for the conductivity in response to a step function change in the electric field were proportional to (n_e0l/σ_0E^2) and were a few tens of microseconds for a field strength in the range 3 to 10 v/cm. The ionization rate appeared to be limited primarily by the heating rate for the plasma, and the short relaxation times suggest that ionization occurs by a multistep process. Analysis of conductivity and light intensity data obtained during the transient period indicates that the electron temperature approaches its final value during the first few microseconds.

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Additional Information:© 1964, by the American Institute of Aeronautics and Astronautics. Presented as Preprint 64-28 at the AIAA Aerospace Sciences Meeting, New York, January 20-22,1964; revision received May 20, 1964. This work was supported by the Air Force Office of Scientific Research under Grant No. AF-AFOSR-160-63.
Group:Guggenheim Jet Propulsion Center
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Air Force Office of Scientific Research (AFOSR)AF-AFOSR-160-63
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Guggenheim Jet Propulsion Center UNSPECIFIED
AIAA Aerospace Sciences Meeting Preprint64-28
Issue or Number:8
Record Number:CaltechAUTHORS:20110105-090038619
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Official Citation:Experiments concerning nonequilibrium conductivity in a seeded plasma COOL, T. A., CALIFORNIA INST. OF TECH., DANIEL AND FLORENCE GUGGENHEIM JET PROPULSION CENTER, PASADENA, CALIF.; GIBSON, E. G., ; ZUKOSKI, E. E., AIAA Journal 1964 0001-1452 vol.2 no.8 (1410-1417) doi: 10.2514/3.2559
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21595
Deposited By: Ruth Sustaita
Deposited On:12 Jan 2011 19:58
Last Modified:09 Nov 2021 15:58

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