Development program for a 200 kW, CW, 28 GHz gyroklystron. Quarterly report No. 2

During this quarter, the detailed cold test work for design of the input and output cavities was completed. Cold tests were also made to study microwave output coupling through large diameter collectors and microwave loading in the drift tube between cavities. A mechanical design was worked out for the output window and construction was started on a trial window. An external output water load was also designed for oversized circular electric mode waveguide. Considerable magnetic design work was done using computer simulation. The electrical design of the main 11 kg magnet has been completed. A simulation of the magnetic field in the collector region has produced very nearly the desired results for a 5.75 inch diameter collector. The calculation used two coils outside the main magnet. Simulation of the required magnetic field in the gun region is discussed in this report. The detailed mechanical design of the electron gun has been completed. A preliminary mechanical design of the cw tube is also presented, and the design of the pulsed experimental tube is discussed. In the area of amplifier analysis, the effects of space charge on gain are estimated, and the small-signal gain theory is compared to the results of ballistic more » computer calculations. Additional large-signal calculations are also presented. « less