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A method for control of electric field distribution in the near-cathode region of a magnetron-injection gun has been developed. The possibility to improve quality of the helical electron beam by regulated non-uniformities of electric field is studied experimentally and using computer modeling.
For the deep investigation of electron tubes simulation software is necessary to avoid high prototyping costs. The software used in this paper for analyzing a virtual cathode oscillator is the CST STUDIO SUITE™. It is based on the Finite Integration Technique (FIT) and includes a sophisticated particle in cell code. Besides the virtual cathode oscillator also other vacuum tube applications will be...
We have researched breaking the trade-off limitations between the overall loss and the reverse recovery softness of High Voltage (HV) freewheeling diodes. For the first time, our results show that the oscillatory phenomena in the reverse operation for HV diodes originate in the enlarging behavior of the space charge region to the cathode side during reverse operation and the extracting hole velocity...
The authors analyzed the surge voltage causing the oscillation in detail and found that the peak electric field at punch-through EP is proportional to the maximum surge voltage. The maximum surge voltage can be decreased by shifting the punch-through position WP toward the cathode side because the WP shift leads EP lowering. This dynamic punch-through design is applicable for whole operating condition...
A design study of a 0.1-THz coupled-cavity backward-wave oscillator (CCBWO) is presented using a finite element method and a particle-in-cell simulation. In experiments, the Si-based technology of 2-step deep reactive ion etching (DRIE) and eutectic bonding shows a good potential for the microfabrication of the interaction circuit. A miniaturized field emission cathode using carbon nanotubes grown...
We use FDTD PIC codes to simulation virtual cathode oscillators and employ three analytical models and an empirical estimation to determine the corresponding frequencies of oscillations to help understand the vircator.
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