Study of the amplification of microwaves in a plasma tube

This paper concerns the studies of the amplification of microwaves by the interaction of an electron beam with a cesium plasma generated by surface ionization on a heated tungsten wire. The work was concentrated on the following three points: the measurements of noise figures, the comparison of the measured plasma density with the frequency having the maximum gain, and the amplification factors. According to the experimental results, the noise figure with the foregoing plasma tube was 29 dB at the plasma frequency of 1500 MC, which is remarkably smaller than hitherto expected.