Peniotron mode radiation of a 16 slot cusptron oscillator

Summary form only given. Recently, using the peniotron mechanism for high power microwave generation has drawn a considerable amount of attention both theoretically and experimentally. This is because: 1. high efficiency is expected as all beam electrons tend to lose nearly the same amount of energy, regardless of their initial phases relative to the RF field, 2. the guiding center spread of the e-beam is tolerable up to 30%, and 3. it is less contingent on the cyclotron resonance condition and thus, overwhelms the gyrotron interaction in mode competition for a sufficient time. In this work, we first investigate two peniotron modes (TE/sub 12/ 2/spl pi/ mode and TE/sub n/ /spl pi/ mode) in a cusptron configuration via numerical simulations. The results show that both modes can be excited separately in our experimental device for microwave generation. They are indeed confirmed experimentally by matching the frequencies of the radiations with the dispersion relation of the two peniotron modes in the 16 slot waveguide. The output signals of the TE/sub 12/ and the TE/sub n/ modes (before accounting for the insertion loss of the measurements) are detected to be -10 dBm and -25 dBm, respectively. They represent 30 W and 1 W with an estimated 55 dB insertion loss.