Parametric refregeration discussion and experimental verification of the removal of slow-wave noise
It was for some time believed that it is impossible to remove noise from the slow waves of an electron beam . Since the operation of a large class of microwave amplifiers depends on the coupling of the negative energy slow wave to a circuit, this belief led to the statement of various minimum noise figure theorems . As a result of these theorems, much effort has been expended on the development of amplifiers which use the fast beam waves ; these waves may, in principle, be stripped of all emission excited noise.
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