Accession Number : AD0473662


Title :   MEASUREMENT OF ELECTRICAL CONDUCTIVITY IN A LOW-DENSITY SUPERSONIC PLASMA


Descriptive Note : Technical rept.


Corporate Author : ARO INC ARNOLD AFS TN


Personal Author(s) : Sprouse, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/473662.pdf


Report Date : Nov 1965


Pagination or Media Count : 36


Abstract : Electrical conductivities in the range from 70 to 280 mhos/meter were measured in an arc-heated, low-density, supersonic argon plasma. Measurements were made using a single layer coil acting as one branch of a tuned parallel circuit of a crystalcontrolled oscillator operating at 5 mc/sec. Electromagnetic coupling between radio-frequency-excited coils and plasmas was examined, and the results are presented in terms of a nondimensional parameter, Qs, which, for a particular coil, is a function only of the conductivity of the plasma surrounding the coil. Calculated conductivities using a combined form of the Spitzer-Harm and Chapman-Cowling equations for prescribed plasma conditions compare favorably with the measured results.


Descriptors :   *ARGON , *ELECTRICAL CONDUCTIVITY , ARC HEATING , COILS , CONDUCTIVITY , COUPLING(INTERACTION) , CRYSTALS , DENSITY , ELECTROMAGNETIC PROBES , ELECTROMAGNETIC RADIATION , LAYERS , LOW DENSITY , MEASURING INSTRUMENTS , OSCILLATION , OSCILLATORS , PARALLEL ORIENTATION , PLASMAS(PHYSICS) , SUPERSONIC CHARACTERISTICS , SUPERSONIC FLOW , TRANSDUCERS , TUNED CIRCUITS


Subject Categories : Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE