Accession Number:

AD0419614

Title:

DIAGNOSIS OF PLASMA CYLINDERS BY ANGULAR SCATTERING OF MICROWAVES,

Descriptive Note:

Corporate Author:

ARMY MISSILE COMMAND REDSTONE ARSENAL ALA PHYSICAL SCIENCES LAB

Personal Author(s):

Report Date:

1963-03-31

Pagination or Media Count:

73.0

Abstract:

The determination of the electron density and collision frequency of a plasma cylinder through the measurement of the angular distribution of free-space electromagnetic waves scattered by the cylinder was investigated experimentally. A 20 kilowatt, dc arc, argon plasma jet formed a cylindrical plasma requiring no containing walls. Angular scattering distributions were measured at 35 and 72 kmc. A 72 kmc microwave interferometer provided an independent measure ment of the plasma properties. Predicted values for the magnitude and phase of the scattered field were obtained, using an IBM 7090 computer to solve the scattering problem for a homogeneous, infinitely long plasma cylinder having a range of electron densities and collision frequencies.The plasma jet was found to have a rapidly de creasing electron density as a function of radius. The value of angular scattering measure ments in determining the properties of such inhomogeneous plasma cylinders is shown. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE