QUANTUM FIELD DESCRIPTION OF THE INTERACTING BOSE-PARTICLES SYSTEMS

Yu.M. Poluektov

Abstract
The quantum field approach to research of the many-particle bose-systems which are taking place at finite temperature in states with spontaneously broken symmetries is formulated. As initial approximation of the self-consistent field generalized model for spatially - inhomogeneous multiparticle bose-systems is used. The perturbation theory is advanced and the diagram technique for the temperature Green functions, determined through the field operators and quasiparticle operators is constructed. The Dyson equation that self-energy function connected with vertex function is obtained. The offered approach differs from the known Belyaev-approach, founded on selection as a zero approximation of the model an ideal Bose gas with a condensate.

KEY WORDS: Bose particle, the self-consistent field, Bose condensate, quasiparticle, phase symmetry, perturbation theory, diagram technique, Green function.

REGULAR SUPERMATRIX SOLUTIONS FOR QUANTUM YANG-BAXTER EQUATION

S.A. Duplij, A.S. Sadovnikov

Abstract
The "set-theoretical" solutions of the quantum Yang-Baxter equation playing important role in the theory of quantum groups and statistical physics are considered. Supermatrix noninvertible solutions in the linear superspace defining regular R-matric are analyzed. Regular Yang-Baxter maps for the case of the (1|0) and (1|1)-dimenstional superspaces are received. Also noninvertible block solutions are constructed over invertible block by means of the weakening invertibility till regularity, and some examples are given.

KEY WORDS: Yang-Baxter equation, supermatrix, Grassmann algebra, regularity.

SURFACE WAVES IN PLANAR WAVEGUIDE STRUCTURE 'METAL-DIELECTRIC-MAGNETIZED PLASMA OF A FINITE PRESSURE'

N.A. Azarenkov, Yu.A. Akimov, V.P. Olefir

Abstract
The dispersion properties and field spatial distribution of the potential surface wave that propagates along 'metal-dielectric-magnetized plasma of final pressure' interfaces are studied. The external steady magnetic field is directed perpendicularly to the medium interfaces. To plasma describe the hydrodynamic approximation with electron thermal motion and collision frequency is used. The influence of a finite metal conductivity value, dielectric parameters, electron collision frequency and value of the external magnetic field on wave properties is investigated. The influence of these parameters on region of generally surface waves existence and on spatial distribution of wave field is researched.

KEY WORDS: surface waves, dispersion, phase and group velocities, damping decrement.

BEEM-DRIFT INSTABILITY OF PLASMA WITH AXIS ENCIRCLING IONS

V.S. Mikhailenko, D.V. Chibisov

Abstract
The beam-drift instability of axially symmetric s plasma with arbitrary radial distribution of density is investigated. Ions of plasma are axis encircling. The condition of instability excitation is found. Based on nonlinear interaction cylindrical wave theory the evolution of beam-drift instability is studied. The saturation level of drift turbulence is determined.

KEY WORDS: plasma, axis encircling ions, cylindrical waves, beam-drift instability, drift turbulence.

HIGH FREQUENCY WAY OF HELIUM ASH REMOVAL FROM STELLARATOR-REACTOR

D.L. Grekov

Abstract
The paper deals with the problem of helium ash removal from a stellarator - reactor. To solve this problem the lower hybrid heating of ash ions is proposed. The theory of ion stochastic heating developed earlier is generalized on the case of heating in stellarators. The features of the lower hybrid waves propagation and the ions motion in the stellarator magnetic field are taken into account. It is shown that at the proper choice of the lower hybrid heating parameters the helium ash is expelled from the plasma very effectively. At the same time the heating does not effect the higher energy ions.

KEY WORDS: helium ash, removal, stellarator, lower hybrid heating.

EXCITATION OF SECONDARY WAVES IN GAS OF QUASI-PARTICLES BY EXTERNAL FIELDS

V.D. Khodusov

Abstract
From nonliniar equations of gas dynamics of Bose quasi-particles (phonons, magnons, plasmons, etc.) with allowance for of external fields, which modulated energy of the quasi-particles adiabatically an equation, describing the excitation of secondary waves by this fields has been obtained. Linear secondary waves described by an equation of enforced waves. Exitation of nonliniary secondary waves described by the inhomogeneous generalised Burgers equation.

KEY WORDS: quasiparticles, phonons, magnons, nonlinearity, secondary waves, inhomogeneous generalized Burgers equation.

FINE STRUCTURE OF THE ANALOGUE 2p_3/2 RESONANCE IN ²³Na

A.N. Vodin, A.S. Kachan, R.P. Slabospitsky, S.A. Trotsenko, I.V. Ushakov

Abstract
The g decay of the analogue 2p_3/2 state in ²³Na which displays in the ²²Ne(p,g)²³Na reaction as a fine structure consisting of two resonances with Е_p = 1967 and 2174 keV was studied. The strengths of given resonances were determined, g decay schemes were made and partial g-ray widths were evaluated. The rate of M1 transition (p_3/2, T_> = 3/2) ® (p_3/2, T_< = 1/2) was strong delayed in relation with its value obtained in the frame of many particle shell model with surface d forces. It was established that at g-decay of the analogue 2p_3/2-resonance were more intensively populated levels with E^* = 0.440 (5/2⁺) and 2.391 (1/2⁺) MeV. This fact was explained by existing of interferential effects between the analogue state and the Е1 giant resonance.

KEY WORDS: ²²Ne(p,g)²³Na reaction, isospin, analogue state, g-decay, probability of g-transition.

DIPOLE RELAXATION IN WATER. BASIC DISPERTION REGION

A.A. Asheko, K.E. Nemchenko

Abstract
The processing of obtained experimental data, as well as data of other authors on temperature and frequency dependencies of dielectric permittivity of water is made out at the frequencies 9.54; 35.55; 47.78 and 75.43 GHz and in the temperature range from 0 to 90°C. This investigation showed that her exists as well as low frequency region and the high frequency region of relaxation in water in the frequency range wt > 1. The relaxation parameters of this dispersion region have been determined.

KEY WORDS: dipole relaxation, dielectric spectroscopy, complex dielectric permittivity, relaxation time, water.

PHONON SPECTRUM OF BCC CRYSTALS IN MODEL WITH ELASTIC LINKS BETWEEN THE ATOMS FROM THREE NEAREST COORDINATION SPHERES

I.N. Kudryavtsev, K.E. Nemchenko

Abstract
Analytical expressions for the phonon dispersion law in bcc crystals are obtained with account for the central interaction of atoms from three nearest coordination spheres. Numerical calculations of dispersion dependences for crystal Ba are accomplished, which agree with the available experimental data. Sound velocities for Ba in various crystallographic directions are calculated.

KEY WORDS: bcc crystals, dynamical matrix, phonon spectrum, dispersion law, force constants, sound velocities, phonon density of states.

MODELING OF INTENSIVE X-RAY GENERATOR ON THE BASIS OF LOW PRESSURE PLASMA DIODE

V.N. Borisko, A.F. Tseluyko, V.T. Lazurik, D.V. Zinov'ev, S.V. Borisko

Abstract
The flash X-ray generator on the basis of a high-current plasma diode of low pressure with an extended interelectrode gap is offered. Most effective operation mode of a plasma diode for X-ray generators and the software ModeXR (Modeling of X-ray Tube) for experimental and theoretical investigations of generators is described. Simulation results of X-ray generator with a plasma diode were analyzed and comparison with generators on the basis of vacuum diodes is discussed.

KEY WORDS: X-ray, dose, bremsstrahlung, plasma, double layer, Monte Carlo simulation.

IMPACT STRENGTH OF BERYLLIUM

P.I. Stoev, I.I. Papirov, N.A. Azarenkov

Abstract
The influence of heat treatment and state of a surface on the impact strength of hot-pressed technical beryllium is investigated. The values of impact strength are determined for beryllium specimens which are produced by various methods of machining. The value of impact strength is shown to be determined by presence of a defect layer on the material surface. It is found that the beryllium specimens with a surface layer of 250-300 microns removed by chemical treatment possess the maximal impact strength. The efficiency of annealing, as a method of elimination of the defect layer, is noticeably lower than of chemical polishing. It is shown, that the impact strength of hot-pressed beryllium is anisotropic: at the specimens cut out along the axis of pressing it is 50% lower than cut out in the transversal direction. The influence of low and high-temperature coating on impact strength of hot-pressed beryllium is also investigated, and the positive effect of tin and silver based coating is established.

KEY WORDS: beryllium, impact strength, thermal treatment, coating.

STUDY OF SILICIDES MICROSTRUCTURE AND WAY ITS CONTROL

A.A. Zavalishin, S.Yu. Zubova, S.V. Lytovchenko, T.S. Maslova, V.O. Chishkala

Abstract
The molybdenum silicides microstructure depending on the forming condition is studied. The quantitative metallography method establishes the average size of a grain, size distribution of grains and a phase structure. The influence of processing separate technology factors and initial characteristics of a molybdenum substrate on a microstructure is determined. The capability of a silicides microstructure regulation by variation of saturating environment, temperature, annealing mode, additives and other characteristics is shown.

KEY WORDS: microstructure, molybdenum silicides, quantitative metallography, grain size, structural - phase transformation.

ELECTRON BEAM AUTOBUNCHING IN LINAC INJECTOR

M.I. Ayzatsky, A.N. Dovbnya, V.A. Kushnir, V.V. Mitrochenko, A.N. Opanasenko, S.A. Perezhogin, D.L. Stepin

Abstract
Results of integrated research of electron beam shaping in the injector system of high current resonance linac are reported in the paper. The injector consists of low voltage electron source, bunching cavity and accelerating cavity. Due to complementary electromagnetic oscillation exciting by the beam in the bunching cavity the beam can be autobunched in such system. The consideration of this phenomenon in detail is paid dominant attention in the paper. Computed results of the self-consistent problem are compared with experimental results.

KEY WORDS: electron beam, emittance, linac, injector.

MONOCUSP NEGATIVE ION SOURCE WITH PLASMA EMITTER OF ELECTRONS

V.N. Borisko, A.A. Petrushenya

Abstract
In the present paper the emission characteristics of the monocusp negative ion source were experimentally investigated. In the source a low-temperature plasma was created by the low-energy electron beam injected from plasma electron source with hollow cathode. The comparative analysis of influence of various working gas mixtures on efficiency of negative ion generation was performed. The negative ion beams of hydrogen and F^- with current value of 325 мkА and density of 0.74 мА/cm² were obtained. The methods of increase of the negative ion generation efficiency of such sources were determined.

KEY WORDS: plasma, source, negative ions, plasma electron emitter.

CALCULATION OF OPTIMAL PARAMETERS BREMSSTRAHLUNG CONVERTOR FOR MEDICAL RADIONUCLIDES PRODUCTION

B.I. Shramenko, A.V. Torgovkin

Abstract
The GEANT4 simulation of nuclear-physics processes of high energy electrons passage through the matter are presented. Bremsstrahlung characteristics for various parameters of converter are obtained. The optimal thickness of converter under the condition of beam power approximately 1 kW is estimated. The comparison of experimental data with calculated data has been done.

KEY WORDS: radionuclides, computer simulation, bremsstrahlung electrons, convertor.

A SYSTEM OF RF POWER SUPPLY FOR THE 10 MEV LINEAR PROTON ACCELERATOR WITH A MODIFIED PHASE-ALTERNATING FOCUSING OF A BEAM

L.D. Lobzov, P.A. Demchenko, Ye.V. Gussev, N.G. Shulika, A.V. Ovchinnikov, V.F. Kovalenko

Abstract
The present paper presents a block diagram of a system of RF power supply for the linear resonance proton accelerator with the energy W = 10 MeV and the operating frequency f = 148.5 MHz. The proton accelerator comprises three resonator sections with a H-wave accelerating structure. To every of sections the RF-power is supplied from a separate multicascade amplifier channel. The operating frequency of the accelerator's RF power supply is determined by the eigen frequency of the 1-st resonator included into the scheme of of self-energizing operating mode of the 1-st amplifier channel. Synchronization of operating frequencies of the 1-st and the 2-nd amplifier channels is provided by the rf signals from the 1-st resonator. All the resonators are tuned at a main frequency of the accelerator by means of mechanical adjusting the corresponding tuning elements. Accelerating field stabilization is performed by introduction of the reverse feed-back involving the power amplifier channel and the corresponding resonator. Thereby provided is the compensation of the perturbed amplitude and the RF phase in the accelerator's resonator in a case of eventual changing its parameters as well as under beam current dynamic loadings. The offered block-diagram of the RF power supply system is applied for experimental investigations under conditions of steady and stable operation of the linear proton accelerator.

KEY WORDS: linear proton accelerator, self-energizing system of HF power supply, accelerating field stabilization, reverse feedback, multipactoring phenomena.

THE LIFE TIME OF A NUMBER OF ELECTRON-EXCITED STATES OF CuCl MOLECULE THAT IS IN LOW VIBRATIONAL STATE

V.V. Gritsyna, S.P. Gokov, D.I. Shevchenko,  A.G. Koval'

Abstract
In the given work the method of determination of life times of the electron-excited states of the molecules, based on spatial distribution of radiation emitted by them is offered. Life times of a number of CuCl molecule electron-excited states forming at a bombardment of CuCl₂•2H₂O target surfaces by argon ions of keVs energies have been determined.

KEY WORDS: sputtering, electron-excited states of the molecules, life time.

INVESTIGATION OF EMISSION CHARACTERISTICS OF H^- ION SOURCE ON THE BASIS OF REFLECTIVE DISCHARGE WITH METAL HYDRIDE CATHODE

V.N. Borisko, S.V. Borisko, Ye.V. Klochko, D.L. Ryabchikov, I.N. Sereda

Abstract
The theoretical and experimental investigations of emission characteristics of the plasma source of negative hydrogen ions have been carried out on the basis of the Penning discharge with the metal-hydride cathode. It is shown, that the use of the metal-hydride as a material of the cathode allows to increase gas and current efficiency of this device. This effect is determined by an ion-induced desorption of vibrationally excited hydrogen molecules from the metal-hydride surface.

KEY WORDS: plasma, Penning discharge, ions source, negative ions of hydrogen, metal-hydride.

THE INFLUENCE OF VANADIUM ADDITION ON THE SEGREGATION OF DOPED Fe⁵⁷ ATOMS IN SUBSURFACE LAYERS OF ZIRCONIUM - BASED ALLOYS

V.G. Kirichenko, A.I. Snurnikova

Abstract
By using X-ray analysis and Conversion Electron Mossbauer Spectroscopy the investigation of structure and subsurface layers of zirconium alloys with vanadium and iron addition is carried. The founded compositional and structural heterogeneity of subsurface layer of binary alloys which displayed in the rise of Fe⁵⁷ concentration in layer about 3000  is suppressed in ternary alloy zirconium - iron - vanadium. As the observed segregation of doped iron as the suppression of segregation by vanadium addition are agreed with calculations of surface segregation in Miedema approximation of alloys formation.

KEY WORDS: zirconium, alloys, iron, vanadium, structure, composition, surface, segregation.

ORDERLY STRUCTURES IN MATERIALS FOR ELECTRICAL ENGINEERING AND ENERGY

V.F. Klepikov, V.V. Lytvynenko, A.S. Molev

Abstract
The influence of spatially modulated orderly phases in electrical engineering and electrophysical materials on functional properties of these materials, as well as corresponding devices and units, is considered. We discuss the effect of multidomain structure in various characteristics of electrical engineering steels, the influence of domain structure on energy losses and the role of grates peculiar to electrical and magnetic domains on improving parameters of memory devices and other units.

KEY WORDS: orderly structures, incommensurate phases, domains, materials for electrical engineering, ferroelecrics.