Amplification of Radio-Waves in Partially Ionized Gases

概要

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The amplification of radio-frequency wave is observed in partially ionized gases, having large Ramsauer effect, in the absence of magnetic field. This paper gives results showing power gains of more than 4db at 60Mc/s and 3db at 20Mc/s in a xenon discharge plasma. By adjusting a dc grid current of a triode-type discharge tube, a strong attenuation or an amplification of an applied γf wave or an intense γf emission with no input signal is observed. This phenomenon occurs in pulses at some definite phase of a If oscillation existing in the dc discharge when the detecting frequency is smaller than the critical one, which is somewhat smaller than the collision frequency of the plasma electrons. It is considered that experimental results are interpreted as a phenomenon of the negative absorption due to the stimulated brems-strahlung in partially ionized gases.
社団法人日本物理学会の論文
1967-01-05