Supplementary report No. 2: millimeter wave study program

This report describes work done during the months of February, March, and April 1976 on a program to study the feasibility of a microwave amplifier capable of 100 to 200 kW cw power output at 120 GHz. During this period a small signal gain analysis was developed for a multicavity gyroklystron amplifier. This analysis includes relativistic effects to first order but neglects space charge. Methods of calculating small signal gain and stability in the gyroklystron are described. Calculations of electronic beam loading were also made on the computer to show the effects of signal strength on beam loading. Large signal calculations were also made to show the effect of a tapered axial magnetic field on the efficiency and stability of the output cavity. Other work included electron gun simulation on the computer specifically directed to a 200 kW 28 GHz gyroklystron, and microwave cold test work to investigate cavity loading techniques and intercoupling between cavities