This paper presents the computer modeling results, explaining the generation mechanism of periodical electron bunches in a cold cathode metal secondary-emission magnetron gun and describes a scenario of the secondary-emission electron multiplication at the front and droop portions of the anode voltage pulse. An analytical model for analyzing the kinematical characteristics of the formed electron cloud and a self-consistent numerical mathematical model on the basis of the particle-in-cell method for studying the collective electron processes have been developed. The general stages of forming the electron beam in the cold cathode secondary-emission magnetron gun are shown. It is shown that an efficiency of secondary-electron multiplication depends on the shape and parameters of the high-voltage pulse. The obtained results of the computer modeling are in good agreement with the experimental data.

An electron accelerator in which magnetron guns with secondary-emission cathodes of two types are used as a particle source is described. The electron-beam parameters are investigated in an electron energy range of 20–150 keV at a pulse length of 10–50 μs. Results of target irradiation by an electron beam are represented. The target surface structure is studied by the metallographic method, and the microhardness and strength of zirconium materials are measured. The possibility of beam current control by factors of 2.5–3.5 with various methods is shown.

Various techniques have been investigated for forming a high-voltage pulse to energize magnetron guns with secondary-emission cathodes. To generate a powerful beam, it was necessary that the storage element in the modulator should have a low wave impedance. A capacitor and a low-impedance forming line were used as a storage element. The flat part of the pulse was formed by means of different correction circuits. The influence of correction circuit elements on the pulse form has been investigated. Consideration has been given to the circuits of spike control by means of the driving generator, and also, by including the correction circuits in the discharge circuit. Spike formation through the use of pulse-transformer parasitic parameters was also considered. The undertaken studies have demonstrated the possibility of creating a modulator for energizing the accelerator with electron energy up to 150 keV.

The system for visual monitoring of the electron beam was developed and implemented. The technique is based on registration of optical radiation, which is generated under object-beam interaction. The system comprises image transferring channel, remote-controlled digital photo-camera, connected with PC by USB-interface as well as proper software. The images obtained give information on the beam density distribution over the surface of the object being irradiated. 40 keV and 10 MeV electron beams were researched.

Data are reported on electron beam generation and beam current control in two types of secondary-emission cathode magnetron guns. The influence of the magnetic field value and field distribution on the formation of the beam and its parameters has been investigated in the electron energy range between 20 and 150 keV. The influence of local magnetic field variations on the cathode and the electron beam characteristics has been studied. The possibility to control the electron beam current in various ways has been demonstrated.

In this study we describe a direct-action accelerator in which the particle source is a magnetron gun with a secondary-emission cathode (the cathode and anode of the gun are 40 and 78 mm in diameter, respectively) devised for electron-beam technologies. The parameters of the electron beam are studied in an electron energy range of 60–150 keV at a pulse length of 10–20 μs and a pulse repetition frequency of 2 Hz. Schemes for irradiating flat, outside, and inner cylindrical surfaces are described. The results of the electron-beam irradiation of a flat surface of zirconium and a Zr1% Nb alloy are presented: the electron energy is 70–80 keV; the energy density on the samples cut out of fuel cladding pipes is 10–20 J/cm2. The beam transport in a decreasing and increasing magnetic field of a solenoid is experimentally studied to explore the possibility of irradiating cylindrical surfaces.

Studies have been made into the parameters of the electron beam produced by the accelerator with the secondary-emission cathode magnetron gun as the basis. The experiments were performed in the energy range between 80 and 150 keV with a specific beam power on the target from 5 to 20 J/cm2, this permitting the use of the beam for irradiating material surfaces. Plane metal samples were subjected to irradiation, and the radiated structure of material surface was examined by metallography methods. Experiments were made to measure the accelerator beam size in both decreasing and increasing magnetic fields; the possibility of irradiating inner and outer of cylindrical surfaces was demonstrated.

Experimental results are first presented on excitation of noncommunicative plasmons an electronic bunch in metallic nanoparticles. An electromagnetic response is incorporated in an optical range. The spectrum of the excited frequencies is determined by the concentration of electronic gas and geometrical sizes of particles. Application of bunches is promoted by efficiency of power exchange with metallic nanostructures. The got results open the prospects of further development of works in area of charged particles acceleration by light with the use of nanoresonators and nanowaveguide.

Radiation processes of formation of amorphous-microcrystalline heterostructures with the quantum threads, providing charge carriers collection from semiconductor bulk in the silicon photoconverters of new generation are investigated.

Soft hardware complex to study parameters of magnetron gun in various modes was presented. Digital camera Canon G9 was applied to display an image of electron beam print. Camera control, record and images displaying are carried out using Remote Shooting program.

Quantum structures with enhanced electric conductivity have been formed in a single-crystal silicon matrix. An array of quantum filaments improves the collection of low-mobility charge carriers in the emitter structure of the c - Si(p, n) photoconverter. Experimental results of applying radiation technologies for creation of that sort of structures are presented.

Results of metallographic investigation of the surface of KhVG, Kh18N10T steels and VT-1 titanium after irradiation with a pipe electron beam of the accelerator based on the magnetron gun with a copper secondary-emission cathode are presented. It has been shown that this accelerator can provide an electron beam with parameters required for a purposeful modification of the surface of metals and alloys.

The paper considers the possibilities of stabilization of microstructures created in the latent tracks in single-crystalline silicon by multicharged. ions from the nuclear fragments formed as a result of heavy element photofission in the process of hydrogenating. The presence of hydrogen in the amorphous silicon structures leads to the clustering of vacancies, intrinsic interstitial and impurity atoms. For quantum structures, passivated with hydrogen atoms, the annihilation process is slowed down. In the process of annealing the silicon structures the strong (Si - H)(n)-bonds prevent the defect annihilation and thus stimulate the processes of precipitation and clusterization. Hydrogen, filling the irradiation-broken bonds, neutralizes their electrical activity. Optimal conditions for stabilisation of such structures are determined: irradiation doses, methods of hydrogenation and dissociation of H-2, annealing parameters.

The report is concerned with the possibility of monitoring the parameters of the beam in the magnetron gun with a secondary-emission cathode by using magnetic fields of permanent ring-shaped magnets. The measured magnetic-field distributions of permanent magnets are presented. Consideration has been given to the possibility of controlling the beam current and size on the Faraday cup. The experimental results are reported.

Results of investigation generation and parameters of anode current in magnetron gun is representative. Regime generation is closed, when all electron current go to the anode (diameter cathode 40 mm and diameter anode 70 mm). Obtained results are discussed.

The reliability and service life of accelerating installations are substantially determined by the lifetime of electron sources. The accelerator under consideration has a magnetron gun with a channel-free cold secondary-emission cathode in crossed fields as an electron source [1, 2]. In the present work, the data of the electron beam parameters obtained in the accelerator based on the magnetron gun with a secondary-emission cathode are given, and possible secondary uses are suggested.

The investigation of forming high voltage pulses for feeding power magnetron gun was made. Use of LC-circuit stop the discharge current across thyratron and give ability step over from full discharge accumulation element to partial discharge. Efficiency of modulator will be above.