Peniotron oscillations in rising sun cavity

Summary form only given as follows. For the first time ever, peniotron oscillations have been observed from a peniotron oscillator operating at the f=4f/sub c/ harmonic at 90 GHz and in a rising-sun magnetron-type waveguide circuit. The experiment was designed to achieve proof of principle at low power for the rising-sun circuit. The beam voltage and current were 9 kV and 0.3 A, respectively. Preliminary results show 65% beam transmission to the collector. The output power achieved was 5 watts. Output power was observed for beam voltages from 7 to over 9 kV. Performance optimization will be achieved by magnetic tuning and shimming. Also to improve on the output power, greater field stability and control of the magnetic field shape will be necessary. Computer controlled power supplies for each of the individual magnetic coils were placed on order. Presented will be the cold-test and optimized hot-test data and how they correlate to simulated performance to determine beam qualify. Presented also will be a description of the gun, circuit and RF window, as well as a high power experiment planned for later this year.