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Impact of Spent Electrons on BWO Operation

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4 Author(s)
Fuks, M.I. ; Dept. of Electr. & Comput. Eng., Univ. of New Mexico, Albuquerque, NM ; Abubakirov, E.B. ; Hahn, K.D. ; Schamiloglu, E.

As a result of their interaction with an operating wave in a backward-wave oscillator (BWO), electrons give up their energy to the electromagnetic field and acquire a large energy spread. The energy spread decreases the space-charge-limiting current, which can result in the formation of a virtual cathode (VC) for low-energy electrons in the output channel. We analyze the influence of electrons reflected from the VC on BWO operation, which manifests as a decrease in the generated power and in the appearance of modulated power. In the region of cyclotron absorption, the reflected electrons cause high-frequency generation with a high noise level.

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Plasma Science, IEEE Transactions on  (Volume:37 ,  Issue: 4 )