Peniotron mode radiation of a 16 slot cusptron oscillator

摘要

Summary form only given. Recently, using the peniotron mechanismfor high power microwave generation has drawn a considerable amount ofattention both theoretically and experimentally. This is because: 1.high efficiency is expected as all beam electrons tend to lose nearlythe same amount of energy, regardless of their initial phases relativeto the RF field, 2. the guiding center spread of the e-beam is tolerableup to 30%, and 3. it is less contingent on the cyclotron resonancecondition and thus, overwhelms the gyrotron interaction in modecompetition for a sufficient time. In this work, we first investigatetwo peniotron modes (TE₁₂ 2π mode and TE_n πmode) in a cusptron configuration via numerical simulations. The resultsshow that both modes can be excited separately in our experimentaldevice for microwave generation. They are indeed confirmedexperimentally by matching the frequencies of the radiations with thedispersion relation of the two peniotron modes in the 16 slot waveguide.The output signals of the TE₁₂ and the TE_n modes(before accounting for the insertion loss of the measurements) aredetected to be -10 dBm and -25 dBm, respectively. They represent 30 Wand 1 W with an estimated 55 dB insertion loss