virtual cathode

virtual cathode

[′vər·chə·wəl ′kath‚ōd]
(electronics)
The locus of a space-charge-potential minimum such that only some of the electrons approaching it are transmitted, the remainder being reflected back to the electron-emitting cathode.
References in periodicals archive ?
A virtual cathode is produced in this device by a nonthermal electron plasma confined in a modified-geometry Penning trap.
The key technologies which may be applied to electromagnetic munitions design in the near term are explosively pumped flux compression generators (FCGs) and high-power microwave (HPM) devices, the most important of which is the virtual cathode oscillator, or vircator.
High-Power Microwave Devices - the Virtual Cathode Oscillator
Under the proper conditions, the virtual cathode is unstable and, if placed in a microwave cavity, will oscillate in the microwave band.
This volume of cells, known as the virtual cathode for that shock, initiates electric stimulation of the rest of the heart.
Using the bidomain model and fluorescent dye methods, the Vanderbilt team predicted that there would be an excessively positive, or hyperpolarized, area on either side of the virtual cathode.
Knisely says that understanding the virtual cathode and anode may allow researchers to find better ways to lengthen that refractory period.
Here, due to voltage depression caused by space-charge effects, some electrons stop forming the virtual cathode at a certain distance from the anode.
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