Yu. D. Chernousov

Microwave field effects on the time dependence of recombination fluorescence from non-polar solutions

Abstract A novel experimental setup to study the effect of microwave field on the kinetics of recombination fluorescence from nonpolar solutions irradiated with nanosecond X-ray pulses is described. Experiments on the observation of the microwave field effects in dodecane and hexane solutions are presented. The most favorable conditions for observation of the microwave induced quantum oscillations are found. The effect of spin locking was observed for the first time in the time-resolved microwave field effects. An efficient method to calculate the spin evolution of a radical pair in a microwave field taking into account relaxation is suggested. Analytical expressions for the microwave field effect in the limiting cases of large and small hyperfine splittings are given.

Transient process in a parallel-coupled accelerating system with regard to beam current loading

The object of investigation is a transient process in a parallel-coupled accelerating structure consisting of accelerating and exciting cavities with regard to losses and beam current loading. Relationships for the oscillation amplitudes in the cavities under transient and stationary conditions, accelerating voltage, and critical current are derived. The feasibility of accelerating voltage stabilization by delaying the beam injection relative to a pulse from a generator is demonstrated.

Bandpass characteristics of coupled resonators

A system of series-coupled transmission cavity resonators formed from sections of regular waveguides separated by coupling windows is considered. Bandpass characteristics of this system are obtained by representing the fields in the cavities in the form of a sum of the waves scattered by the windows. A method for measuring the intercavity coupling coefficient for two coupled resonators is presented and a good agreement between the calculated and measured characteristics is demonstrated.

Specifics of the microwave-breakdown mode in an accelerating structure with parallel coupling

The results of examination of the microwave-breakdown mode in an accelerating structure with parallel coupling are reported. It is demonstrated that breakdown normally occurs in a single cavity of the structure, while other cavities and the structure in general remain unaffected. This is attributed to the fact that neighboring accelerating cavities are almost independent of each other. This feature makes the structure more resistant to breakdown failure and may be used to increase the amplitude of the accelerating field in accelerators with a large number of accelerating structures.

Characteristics of a chemical reactor that is a loaded microwave resonator

Relationships for calculation of the following parameters of reactors with microwave heating of chemical reagents are presented: the coefficient of absorbed microwave energy distribution in the reactor (in the cavity between the resonator walls and reagents) and the efficiency of transformation of microwave energy into heat of the reagents. The range of variation of microwave properties of the reactor during variation of reagent properties is estimated, and the coupling parameters of the resonator with the external line that provide for a high efficiency are determined.

SHF stand for performing high-temperature chemical processes

SHF stand for performing high-temperature chemical processes is designed. SHF stand includes high-Q cavity excited on H102 mode and the magnetron SHF generator of the level of SHF power of 1 kW, the operating frequency of 2470±100 MHz. The power of energy release up to 100 W/cm3, the rate of heating is more than 1000°C/sec. The study of selective catalytic pyrolysis of high-molecular hydrocarbons is performed. The formation of carbon nanostructure from alkanes has studied.

Spectrometer for Optical Detection of the Electron Spin Resonance with an Increased Level of Microwave Power

A spectrometer for optical detection of the electron spin resonance (ESR) spectra of short-lived radical-ion pairs produced by ionizing radiation is described. The setup is based on a standard ESR spectrometer equipped with an adapter for optical detection of spectra and a microwave amplifier. In a solution of n-terphenyl in alkanes, the spin-locking effect has been observed. At a microwave power of 10 W, the microwave magnetic induction is 0.5 mT.

Accelerated Electron-Beam Formation with a High Capture Coefficient in a Parallel Coupled Accelerating Structure

An electron beam with a high (close to 100%) coefficient of electron capture into the regime of acceleration has been obtained in a linear electron accelerator based on a parallel coupled slow-wave structure, electron gun with microwave-controlled injection current, and permanent-magnet beam-focusing system. The high capture coefficient was due to the properties of the accelerating structure, beam-focusing system, and electron-injection system. Main characteristics of the proposed systems are presented.

Microwave Circuit of a Parallel-Coupled Accelerating Structure

The microwave circuit of a parallel-coupled accelerating structure containing accelerating resonators excited by the common high-Q transmission resonator has been investigated. The relations determining the structure operation mode, tuning conditions, and the power supplied to the resonators have been derived.

Heating efficiency of chemical reagents in the microwave cavity

Relationships for technical calculation of the parameters of reactors with microwave heating of chemical reagents are presented. The range of variation of microwave properties of the reactor during variation of reagent properties is estimated, and the coupling parameters of the resonator with the external line providing high efficiency are determined. The experimental data of the absorption degree of microwave energy by different chemical objects in the high-Q resonator are obtained.