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Microwave cross section of an ionized channel [electronic resource].

Published
Livermore, Calif. : Lawrence Livermore Laboratory, 1977.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 28 : digital, PDF file
Additional Creators
Lawrence Livermore Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
At normal incidence, the back scattered, forward scattered and 90/sup 0/ scattered cross sections of the beam were measured at 24 GHz for air and nitrogen at 500 torr pressure. For a single pulse, the measured radius of the beam was 4.3 mm at Z = 80 cm, whereas in a burst the radius decreased to 2.5 mm for the fifth pulse. This corresponds to a density reduction of a factor of 5 and corresponds to a channel temperature of 1200/sup 0/C. Within experimental error, the observed cross sections were those to be expected from a metal rod of these dimensions. There was no evidence of any enhancement in cross section at long times as might be expected from a hydrodynamic channel instability. However, receiver noise would have masked any fluctuations present. The cross sections were also measured with the microwave beam forming an angle of 10/sup 0/ with the electron beam. The backscatter cross section and the bistatic cross section to a second antenna forming an angle of 10/sup 0/ with the beam was also measured. In air, the bistatic and monostatic cross sections were approximately 10 db higher than expected from the beam size measurement, i.e, the returns observed were those one would expect from a good conducting rod approximately 5 cm radius. In nitrogen, the bistatic cross section was the same as air, but the monostatic cross section was 30 db larger than expected. This result is probably due to sausaging induced in the channel by an axial magnetic field. It could, however, be an indication of a fast growing hydrodynamic instability.
Report Numbers
E 1.99:ucid-17238(rev.1)
ucid-17238(rev.1)
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Other Subject(s)
Note
Published through SciTech Connect.
03/17/1977.
"ucid-17238(rev.1)"
Spoerlein, R.; Fessenden, T.; Skinner, A.
Funding Information
W-7405-ENG-48
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