Nonlinear dynamics and bifurcation mechanisms in intense electron beam with virtual cathode

Processes of virtual cathodes interaction in multibeam system

“…Nevertheless, the frequency increase usually leads to a sharp decrease in generation power because, in all known vircator schemes, there exists an optimum value of the injected current. 4,6,11 This makes the use of this method unacceptable for the significant increase in frequency.…”

“…A possible solution to the problem of the vircator generation frequency increase is to develop new generator schemes that are based on a virtual cathode. [11][12][13][14][15] Specifically, this paper describes the development and analysis of a multibeam vircator system. Thus, the idea of creating several VCs in the vircator drift space (by injecting several electron beams with supercritical currents) to increase power of higher-frequency spectral components via the interaction (synchronization) between VCs seems promising.…”

High-efficiency virtual cathode oscillator with photonic crystal

“…7,13,26,27 Various modifications of standard vircator design have been proposed and investigated to improve microwave generation efficiency. 15,19,[28][29][30][31][32] In our opinion, one of the most interesting approaches to enhance vircator characteristics has been proposed in the early 1990s in the experimental work by Gadetskii et al 33 In this work, they have suggested the idea of the hybrid vircator and backward-wave oscillator (vircator-BWO) device. They have succeeded in the generation efficiency increase owing to creating additional electromagnetic feedback with VC by means of backward wave excitation in this device.…”