The high-power scheme for the amplification of powerful microwave signals based on the overcritical electron beam with a virtual cathode (virtual cathode amplifier) has been proposed and investigated numerically. General output characteristics of the virtual cathode amplifier including the dependencies of the power gain on the input signal frequency and amplitude have been obtained and analyzed. The possibility of the geometrical working frequency tuning over the range about 8%-10% has been shown. The obtained results demonstrate that the proposed virtual cathode amplifier scheme may be considered as the perspective high-power microwave amplifier with gain up to 18 dB, and with the following important advantages: the absence of external magnetic field, the simplicity of construction, the possibility of geometrical frequency tuning, and the amplification of relatively powerful microwave signals. V C 2015 AIP Publishing LLC.
We study the properties of microwave generation in a virtual cathode oscillator with a photonic crystal composed of metal grids. Our simulation results show the high efficiency of photonic crystal structure utilization in comparison with the standard scheme of an axial virtual cathode oscillator: operation efficiency reaches 20% at the optimal parameters. The obtained results demonstrate that the virtual cathode oscillator with a photonic crystal can be considered as a prospective high-power microwave source where the vircator operation mechanism and photonic crystal properties complement each other to produce high-power electromagnetic radiation.
Computations of the accelerator section of the International Linear Collider (ILC), which con sists of superconducting niobium cavities, are performed for conditions of the maximum energy transfer to electrons that travel along the cavity axis. A mathematical model and software packages are created for the computation of the electric characteristics and profile of a single cell cavity. A computer based synthesis of the cavity shape that yields the required electric characteristics is performed. The promising design variants of a single cell cavity, with which a quality factor of 10 10 is provided at a working frequency of 1.3 GHz, are found to optimize the construction and manufacture of a single cell cavity. The electric characteristics of a chain of single cell cavities are computed.
The report is devoted to the results of the numerical study and optimization of the double-gap vircator with electromagnetic feedback in CST Particle Studio. The optimal geometrical parameters of this generator when it demonstrates the maximal efficiency were defined for the different working frequencies. The dependencies of the double-gap vircator efficiency on the geometrical parameters were analyzed in the optimal region. The physical processes occuring in the optimized generator were investigated.
Two variants of schemes of a multibeam vircator are proposed and studied in this paper. Numerical analysis of the influence of various parameters of these systems (magnitude of the external magnetic field and detuning of beam currents) on the generation characteristics was conducted. The possibility of synchronizing several virtual cathodes in a single drift space of a multibeam vircator is demonstrated. The regime maps of basic control parameters of the system are built. The possibility of effective interaction of several virtual cathodes in a single drift space is analyzed, and the conditions for implementing an effective addition of powers of each beam at the output load are determined.
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