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Instrumentations and techniques developed at the Institute of High Current Electronics for measurement of parameters of X-band subnanosecond microwave pulses with peak power as high as ~ 109 W are described in the paper.
Results of research aimed at stabilizing microwave radiation parameters in the pulse-periodic mode of relativistic BWO nonstationary generation are discussed. The possibility of electromagnetic oscillation phase fixation within the microwave pulse, as well as of minimization of peak power spread from pulse to pulse is shown.
Two versions of modernized experimental setup (i.e., nonstationary relativistic X-band BWO) were used for the generation of subnanoseeond-width, gigawatt-range pulses of microwave superradiation (SR).
Summary form only given. Investigation results of highly effective energy exchange between electron beam and electromagnetic wave in nonstationary, superradiative Ka-band BWO (SR BWO) under conditions of beam transportation in decreased (less than the cyclotron-resonance value) magnetic field of ~ 2 T are presented. In our previous studies with such conditions the conversion of e-beam power into SR...
The methods and techniques described are of measurements of X-band high power microwave superradiative pulse parameters. The set of the techniques developed in HCEI includes waveguide antennas with improved frequency response, waveguide detectors with subnanosecond time resolution based on thermionic tube diodes as well as based on hot electron effect, alcohol field calorimeter of original design...
Gigawatt repetitively-pulsed relativistic microwave generators with pulse-to-pulse frequency tuning are of interest of some practical applications. Earlier, a 5-15% frequency tuning was demonstrated in single-pulse regime, in particular, in the resonant relativistic BWO, in the feedback-supplied resonant relativistic TWT, and in the two-sectional vircator. However, repetitive operation of these sources...
A study has been performed on the emissive characteristics of a cold graphite cathode in a magnetically insulated coaxial diode under the action of nanosecond accelerating pulses at a pulse repetition frequency (PRF) of up to 3.5 kHz. Emission was observed to degrade at PRF < 1 kHz and recover at PRF ~3.5 kHz. Estimates of the temperature conditions in the region of an explosive electron emission...
Radiation with output power up to 100 MW at wavelength 8 mm, at gain 44 dB and efficiency 11% was obtained in TWT with a relativistic electron beam. In a sectioned generator BWO-twistron, output power was 500 MW at wavelength 10 mm at efficiency 20%.
The experimental data to create relativistic HF-oscillators with the repetition rate up to 103 pps is given. The radiation in the 0.8–3 cm wavelength band with pulse intensity 108–109 W is paid particular attention to. Studied are the relativistic BWO and orotron. The experiments were based on specially designed high-current repetitively-pulsed accelerators with high stability of electron beam parameters.
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