Development program for a 200 kW, CW, 28 GHz gyroklystron. Quarterly report No. 1

During the past quarter, progress was made toward the development of an electron gun which will operate well in a realizable magnetic field. Both small-signal gain and large-signal gain and efficiency calculations were made which indicate that satisfactory gain and efficiency performance can probably be achieved in a two-cavity Gyroklystron. The output cavity was shortened in order to facilitate loading to a sufficiently low Q and to improve its stability. A symmetrical input cavity loading arrangement was found which produced an appropriate Q and also minimizes the excitation of undesired propagating modes in the drift tube. Progress was also made on the input and output waveguide circuitry and windows, and mechanical design has started. These activities are detailed in subsequent sections of this report.