The results are given of the 3-D simulation of the secondary-electro multiplication process in a magnetron with a cold secondary-emission cathode in which the primary electron sources are the blade-shaped field emitters. The application of the anode voltage pulse tandem is conducive to improving the efficiency and reliability of triggering the electromagnetic self-oscillation excitation in a magnetron oscillator, as the nanosecond radiation pulses are being generated.Introduction In Ukraine and Russia the development work on and investigation into cm-and mm-wave magnetron oscillators having a cold secondary-electron emitter (SEE) [1]-[4] are currently well under way. The design of magnetrons whose development has been brought up to a commercial level are normally featured by a cathode system that comprises an additional primary electron emitter (PEE) and the main cold secondaryelectron emitter. The dynamics of the secondary-electron multiplication with the main cold emitter being bombarded by primary electrons is not adequately understood. The information on the trends towards developing the above process is essential when designing an optimal construction of cold SEE magnetrons. In the present paper the results from the study on the possibility for creating an effective cold cathode and oscillatory magnetron are given. These results are based upon the investigation into the secondary-electron multiplication dynamics while the elements of the basic cold SEE are being bombarded with primary electrons from the elements of additional PE. The secondary-electron multiplication dynamics in crossed static electrical and magnetic fields is examined by computer simulation involving a 3-D process model.
Main PartIn developing a cold cathode which comprises the SEE and PE elements it is necessary that the profile of the emitters' operating surfaces and their mutual arrangement be appropriately defined. The problem pertinent to cold cathode synthesis is simplified if the secondary-electron multiplication dynamics is known. A description is given of the design features of cold cathode assemblies (see Figsl and 2), which are used in cm-wave pulse magnetrons [2]- [4]. The dynamics of the secondary-electron multiplication in cold cathode magnetron when generating nanosecond radiation pulse is considered. The proposed model is based upon the solution to a self-consistent problem (the solution of equations of motion, excitation and those of Poisson) in a three-dimensional statement. The simulation of the secondary-electron multiplication dynamics is performed when the schemes (see Fig. 1, a, b) of the cold-cathode design are realized under the following conditions: -nonuniformity of the electrostatic field along the cold cathode axis is not taken into account; -the discs 1 of the field emitter (FE) blade-shaped elements are assumed to be "transparent". The results from simulating the secondary-electron multiplication dynamics suggest that the above process in the aforementioned cold cathode constructions is observed to differ sole...
The application of the drift-orbital theory and 3-D numerical simulation is shown to offer ample scope for constructing a small-sized pulse cold-cathode sub-millimetric-wave magnetron oscillator. As the analytical estimation and computer-aided experiments indicate, the output power of this type of magnetron varies between hundreds of milliWatts and hundreds Watts.
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