THE LARMOTRON A TRANSVERSE WAVE AMPLIFIER.
Final rept. Feb 61-May 63,
SETON HALL UNIV JERSEY CITY NJ
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A theoretical and experimental investigation was concluded on the feasibility of developing a millimeter wave Larmotron amplifier. The Larmotron is a cyclotron wave electron beam amplifier. Nine amplifier tubes were built. Gains of over 10 db were achieved. The characteristics of two alternate forms of dc pumping were explored as well as the possibility of achieving gain by electron beam interaction with a continuous length of slow wave circuit. Two major limiting problems arose in the course of this investigation. One was the blow up of electron beam diameter which occurred when dc pumping was applied to the beam. The other problem was concerned with the difficulty of achieving pure transverse wave modulation of the beam when using a slow wave RF circuit. The details of these problems are presented and conclusions are drawn. Author