Yu. Yu. Danilov

Quasi‐Optical Microwave Pulse Compressor at 34 GHz

We describe a 34.272 GHz pulse compressor based on a three‐mirror traveling‐wave resonator, which creates pulse compression using linear frequency modulation of the input pulse, rather than step‐wise phase modulation used traditionally. The results of testing the compressor prototype at a low power level under different modulation methods and different widths of the input pulse are discussed. We present also the results of calculations and tests of an electrically controlled diffraction grating, which can serve as the active switch for such a three‐mirror resonator.

Linear frequency-modulated pulse compressor based on a three-mirror ring cavity

A pulse compressor using a three-mirror cavity is tested at a frequency of 34.27 GHz and a low power level. The cavity is fed by a wave beam reflected from the corrugated mirror. The fourfold compression of a rectangular chirp is reached with an efficiency of ≈60%.

Microwave pulse compression in a chain of ring-type resonators

Compression of a rectangular chirp-pulse waveform by a chain of nondissipative ring-type resonators is studied theoretically. A three-resonator chain is shown to be capable of compressing a microwave pulse by a factor of 8 with an almost 80% efficiency.

Pulsed cyclic heating of copper surface using high-power 30-GHz free-electron maser

Thermal fatigue of the surface of copper subjected to multiply repeated pulsed microwave heating has been studied in order to estimate the maximum permissible acceleration rate for the CLIC collider at CERN. For this purpose, the damage of copper rings in a test cavity of the JINR-IAP facility was traced under the action of 104–105 microwave pulses at a temperature rise up to 190–250 K in every pulse. The test cavity was loaded by pulses of a high-power 30-GHz free-electron maser. Data on the dynamics of damage developed on the copper surface under the action of a strong electromagnetic field in the cavity are presented.

Theory of a microwave-pulse compressor based on a barrel-shaped cavity with helical-corrugated surface

The radiation damping ratio and the transmission coefficient were calculated for a passive compressor of microwave pulses that is built around a length of an oversized waveguide with a helical-corrugated internal surface.

ON THE THEORY OF A MICROWAVE PULSE COMPRESSOR BASED ON A BARREL-SHAPED CAVITY

We consider a passive microwave pulse compressor based on an open barrel-shaped cavity coupled to a waveguide with perforation in the common wall [1] and calculate the radiation decrement of the cavity mode and the transmission coefficient of the waveguide mode.

Input cavity for high-order asymmetric-mode gyroklystron

A new input cavity design for a high-order asymmetric-mode gyroklystron is proposed. Methods of the selective excitation of a resonant mode with a rotating field structure and the prevention of cavity self-excitation at harmonics of the gyrofrequency are proposed. Results of experimental investigation of the H711 mode cavity for a multimegawatt pulsed gyroklystron are presented.

Microwave pulses compressed in a barrel-shaped resonator with screw corrugation

The microwave pulse compressor proposed previously [1], having the form of an oversized waveguide resonator with a screw-corrugated inner surface, was constructed and experimentally tested. A fivefold compression of microwave pulses with a 70% efficiency was obtained in a 3-cm wavelength range.

Microwave Pulses Compressed in a Quasi-Optical Resonator with Corrugated Mirror

A microwave pulse compressor, representing a three-mirror resonator supplied with a radiation beam reflected from a corrugated mirror, was constructed and experimentally tested. A fivefold compression of microwave pulses with a 70% efficiency was obtained in a 9-mm wavelength range.

Circular Cavities with Corrugated Mirrors Excited by Wave Beams

A wave flow circulating within a mirror system can be coupled to an external wave flow by a mirror corrugation. Such a cavity can function as a resonant ring or as a microwave pulse compressor.