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Gurko A.A.,OJSC Vladykinskiy Mechanical Plant | Suchkov K.I.,Federal State Unitary Enterprise
Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika) | Year: 2014

The state-of-the-art magnetron engineering is lacking reliable methods capable of forecasting cathode's service life and its operational capacity in a low-temperature environment, thus the consistency of these parameters with the specification requirements can be assessed only by means of field tests of an inspection bath. No concurrent views can be traced either in the related research reports as for how to estimate the emissive ability of cathode material for crossed-field devices. It seriously complicates the sound and well-grounded choice of cathode's parameters for every individual device. Several lots of Pd-Ba material, which is used in the cathode being manufactured for commercial magnetrons, have been inspected. The transient condition of turning the autoemission into the explosive emission has been checked by estimating magnetron's operation capacity under a pulse ratio significantly exceeding the specification requirements. The results obtained in course of the research enabled us to make a conclusion about a correlation between magnetron's service life and its operation capacity under low temperatures. The proposed assessment criterion is the peak performance value and the experimentally established value of the pulse ratio, corresponding to the onset time to reach the full operative mode at the first launch of the magnetron under regular environmental conditions. The developed method provides a 100 % forecasting as for specification requirements consistency in terms of durability. This method is identical to the frost resistance test, though under normal environmental conditions. © 2014 by Begell House, Inc. Source

Omirov A.A.,OJSC Vladykinskiy Mechanical Plant
Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika) | Year: 2014

Among all competing oscillation modes in a coaxial magnetron (CM) the slot wave mode is the most challenging to deal with. Effective reactive suppression of this mode allows to increase magnetron's efficiency as the dissipative suppression releases. The reported in the scientific papers methods of calculating the slot wave mode parameters are not free of errors and inappropriate for the case when the peripheral wall of the anode slowing system (ASS) is thicker than 0.1λ. There are either no research data on the reactive suppression of the slot wave mode in a CM of millimeter (mm) wave band. The errors found in the existing method of slow wave mode parameter calculation were eliminated. Some modification of the calculation algorithm was suggested, as well as a new method, applicable to ASS with a peripheral wall thicker than 0.1λ. The suggested method was developed to reactively suppress slow oscillation mode in a CM of mm wave band by means of rectangular coupling slots of various axial length. A close attention is given to the process of "destruction¡" of spatial harmonics spectrum and of the HF-field structure of the slot wave mode under the influence of the reactive suppression. The research results allow to make a conclusion that a reactive "destruction" of the slot wave mode in a CM of mm wave band can be achieved by grouping the rectangular coupling slots of various axial length, while the suppression would be at least as efficient as in the centimeter (cm) wave band, where the coupling slots profiles are diverse. The results obtained in this research increase our knowledge about the methods of the reactive suppression of slot wave modes in a CM, and can be useful in the development and improvement of CM parameters both in the centimeter and millimeter wave band. © 2014 by Begell House, Inc. Source

Gurko A.A.,OJSC Vladykinskiy Mechanical Plant | Chistyakov K.I.,OJSC Vladykinskiy Mechanical Plant
Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika) | Year: 2013

Magnetron is a microwave generator widely applied in radar engineering. In a radar, shorter operating wavelength means a better resolution and/or downsizing of its antenna. However, in the short-wave part of millimeter wave range, one has to deal with a growing relative manufacturing error of magnetron's resonator system. The processing faults distort the structure of the HF-field of the doublet component. As a result, the percentage of faulty magnetrons due to an unsatisfactory efficiency increases. The approach suggested in this paper allows to estimate, on a basis of indirect data, the "distortion" of the spatial harmonics spectrum of the HF-field of magnetron's slowing system, enabling one to proactively detect symptoms of possible defects in magnetron's oscillating system, which may cause a latent spoilage affecting the efficiency. The suggested checkout method can be implemented by means of standard gages, traditionally used in magnetron manufacturing for testing the resonator system parameters at a low power level, which allows to easily integrate this procedure into a standard process. All data necessary for commissioning the described procedure will be derived in a series of experiments. The goal is to decrease the portion of faulty devices in the magnetron production. © 2013 by Begell House, Inc. Source

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