INVESTIGATION OF MODULATIONS ARISING FROM INTER ACTION OF ELECTROMAGNETIC WAVES WITH A PLASMA.
GENERAL TELEPHONE AND ELECTRONICS LABS INC PALO ALTO CALIF
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A theoretical and experimental investigation of the modulations arising from the nonlinear inter action of electromagnetic waves with a free-space helium magneto-plasma slab is reported. Detailed results are presented of the generation of second harmonic and sum and difference frequencies for low-level incident signals at X- and K-bands. The effect of high-level incident waves was de termined empirically. In addition, preliminary experimental data are given of the free-space microwave Luxembourg Effect. The measurement of electron elastic collision cross sections is reported. A Ramsauer type apparatus is described. In the electron energy region from 0.5 to 20 ev, the electron energy spread agreed with calculated values. Scattering cross sections in helium between 10 and 20 ev agreed with previous re sults. Difficulties have been encountered in making accurate measurements at energies below 0.5 ev and a method for overcoming these diffi culties is suggested. Author