The megawatt pulsed power magnetron operating in the L-band was designed based on magnetrons produced in the past at Kubara Lamina. Unlike its predecessors, it is characterized by much higher operating parameters: supply voltage and anode current, which translates into an increase in the obtained output power. The magnetron was designed using software for numerical simulations of the interaction of an electric charge with an alternating electromagnetic field (Particle in Cell - PiC). Aspects such as microwave matching of individual components of the device and thermal resistance of the entire system, including the appropriate type of cooling, have also been subjected to numerical analysis. In order to obtain the proper parameters of power supply of the tube, a dedicated impulse modulator powered by supercapacitors was build. The modifications allowed to obtain a power signal with a sharp and stable edge and a pulse length of the length of single microseconds. Obtaining the optimal power source had a key impact on the tube’s operation. The measurements of tube output power in the waveguide system with dummy load were carried out, during which the output power of the megawatts range was obtained. This magnetron is a tube with the highest output power among the microwave tubes ever designed in the Kubara Lamina Company and probably throughout Poland.
One of the most important parameters that characterize microwave tubes with crossed fields, both amplifiers (CFA), and generating tubes like magnetrons is the noise level. This type of tubes are characterized by relatively high noise levels, which is the main factor limiting their current use in radar transmitters. The main source of noise in microwave tubes of this type is the dispersion of the energy of electrons that are in phase with the spatial wave of the electromagnetic field propagating in the delay line (in case of an amplitron) or in the resonant structure (in case of a magnetron).The results of the research presented in the article concern the technique of determination of Signal to Noise Ratio (SNR) based on the analysis of results obtained during the numerical simulations of the effect of electric charge on a high frequency electromagnetic field. Signal to noise ratio was determined by analysing in-phase and quadrature data recorded in the high frequency simulation. In order to assess the accuracy of the method under investigation, the results from the noise analysis obtained from numerical calculations were compared with the results obtained from real tube measurements performed by a spectrum analyser. On the basis of the research, it appears that performing analysis of noise generated in the interaction area may be useful for preliminary evaluation of the tube at the design stage.
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