DRAFT DESIGN OF RECIRCULATOR SALO MAGNETIC SYSTEM

A.N. Dovbnya, I.S. Guk, S.G. Kononenko, G.G. Koval’ev, A.Y. Mytsykov, F.A. Peev

Full Text :   (1700 kB, Rus.) 

Abstract
Draft design includes an electromagnetic system of two rings of a recycling and system of beam injection. For making the first ring of a recycling were used 10 dipole and 12 quadrupole magnets of EUTERPE storage ring transmitted NSC KIPT by Technische Universiteit Eindhoven. When chose a construction of a dipole magnet for the second recirculator ring and other magnetic devices three-dimensional model of a field was used. The construction is developed for the second ring powerful quadrupoles with a gradient 26 T/m. In total such four quadrupoles are disposed on ring. Developed for injection system dipole magnet is used also for bypass making. Seven dipole magnets and 13 quadrupoles are used in a section of beam injection. A quantity of these quadrupoles can be used in channels of transportation particles on the targets. For change of beam position correctors will be used, allowing to change a path of beam in vertical and horizontal planes.

KEY WORDS: recirculator, electron accelerator, magnet, quadrupole, corrector.

VARIANTS OF USE SUPERCONDUCTING ELECTRON ACCELERATOR SALO AS A DRIVER OF SUBCRITICAL ACCEMBLY

I.S. Guk, A.N. Dovbnya, S.G. Kononenko, M. van der Wiel, J.I.M. Botman, F.A. Peev

Full Text :   (800 kB, Rus.) 

Abstract
The opportunity of making in NSC KIPT the driver using superconducting accelerating structure TESLA is considered. The first variant guesses use as the driver part of equipment of the accelerating complex SALO project. The superconducting RF gun, the channel of transportation and injection of a beam in the accelerating structure, six accelerating modules and magnetic system of the first recirculator arch are used. It is supposed to gain beame with energy 130 MeV and a mean power 130 kw. Possible channels of beam transportation on subcritical assembly are viewed. Variants of focusing beam on a target are analyzed. The second variant guesses framing the linear superconducting accelerator with beam shift in an existing hall where it is possible to dispose subcritical assembly. This variant allows to exclude capital construction completely that will essentially reduce cost of facility.

KEY WORDS: recirculator, electron accelerator, subcritical assembly, superconducting accelerating structure, channel of transportation.

MAGNETIC DIPOLE RESONANCE IN ²⁷Al NUCLEI

A.S. Kachan, I.V. Kurguz, I.S. Kovtunenko, V.M. Mischenko, V.A. Panin

Full Text :   (320 kB, Rus.) 

Abstract
Gamma-decay of the resonance-like structures observed in the ²⁶Mg(p,γ)²⁷Al reaction in the energy range E_p = 0,8-3,0 MeV of accelerated protons was studied. Excitation function, γ- ray spectra were measured for resonances at E_p = 2234, 2383, 2406, 2496, 2539 keV, which composed this resonance-like structure. The M1-resonance is identified on the ground state and excited states of ²⁷Al with E* = 844 and 1014 keV. The total strength of the M1-resonance on the ground state is determined for given nucleus. The position and total strength of M1-resonance on the ground state is explained by taking into account pairing forces.

KEY WORDS: ²⁶Mg(p,γ)²⁷Al reaction, M1 resonance, M1 transition, pairing-energy, giant resonance.

PARTICLE DISTRIBUTIONS OF MAIN QED AND BACKGROUND PROCESSES AT INTERACTION ОF HIGH ENERGY PHOTONS WITH MATTER OF PHOTON POLARIMETER TARGET

D.D. Burdeinyi, V.B. Ganenko, Yu.P. Peresunko, I.M. Shapoval, G.A. Vashchenko

Full Text :   (2700 kB, Eng.) 

Abstract
The angular and energy distributions of the particles resulted from interaction of the polarized photons of energy 50-3000 MeV with matter of the photon polarimeter target were studied. The optimal kinematical ranges were founded for using the pair and triplet photoproduction processes for photon linear polarization measurement. The pair photoproduction could be used in the range up to 2-3 GeV if the coordinate (microstrip) detector with pitches ~100 μm is applied for measurement azimuthal distributions of the line segments between electron and positron crosses the detector plane. The angular region 10°<θ<40° is more suitable if the triplet photoproduction process is used. The conditions were determined for decreasing contribution of the main background process of δ-electron production which strongly influences on the analyzing power of the triplet photopoduction process. For effective δ-electron background suppression it is desirable to apply the differential thresholds of the recoil electrons registration subject to their angle emission. Such approach can allow one to reduce the δ-electron contribution up to ~10% at the most suitable angular intervals 10-40° for polarization measurement.

KEY WORDS: photon beam, linear polarization, photon polarimeter, pair and triplet photoproduction, Compton scattering, recoil electrons, δ-electrons.

KINETIC PROCESS ACCELERATION IN NANOCRYSTALLINE MATERIALS AT ION BOMBARDMENT

A.I. Kalinichenko, S.S. Perepelkin, V.E. Strel'nitskij

Full Text :   (400 kB, Rus.) 

Abstract
In model of subsurface nonlocal thermoelastic peak (TEP), thermoactivation of kinetic processes in nanocrystalline material at irradiation by ions with energy from 25 up to 1000 eV is explored. It is shown, that ion TEP parameters (i.e., radius, the effective lifetime, temperature and pressure) and also number of thermoactivated transitions in the peak essentially depend on the crystal grain size d. On examples of peaks of ions B⁺ and Al⁺, generated, accordingly, in nanocrystalline targets BN and AlN, energy dependence of the mentioned parameters for nanomaterials with the various sizes of crystal grains is explored. The quantitative and qualitative distinctions in predictions of the offered model and the Seitz-Kochler's model of point thermal peak are discussed.

KEY WORDS: nanocrystalline material, ion implantation, thermal peak, kinetic process.

IMPURITY ION TRANSPORT UNDER THE EFFECT OF DRIFT-WAVE-LIKE ELECTROSTATIC FIELD

О. Antufyev, A. Shishkin, Z. Kononenko, B. Weyssow

Full Text :   (600 kB, Eng.) 

Abstract
Heavy impurity ion transport is considered in the vicinity of adjacent rational magnetic surfaces under the drift-wave-like potential. Analytical study is done for the simplified magnetic field in the toroidal magnetic trap with the rotational transform of the magnetic field lines. The numerical study is carried out for the helical plasma. The test particle orbits are followed by the numerical integration of Newton-Lorentz equation system for the charged particle in the magnetic field and quasi-static electric field. As the test particle the tungsten ion is taken.

KEY WORDS: drift wave electric field, electrostatic islands, particle trapping process, impurity ion transport, helical magnetic field.

D+D FUSION PRODUCTS YIELD IN TORSATRON LARGE HELICAL DEVICE

A.V. Eremin, A.A. Shishkin

Full Text :   (290 kB, Eng.) 

Abstract
In the present paper we study the possibility to obtain fusion products and control of fusion products amount in operating torsatron device, particularly Large Helical Device. The study is carried out on the base of the particle and power balance equations where the evolution of plasma parameters in time is being followed also. Access of the ignition and the steady operation for different fueling schemes is studied. There were developed the fueling scenarios which provide the amount of fusion products distinguished two orders magnitude amount. It is shown that varying the fueling rates (the source term in the balance equations) makes it possible to control the fusion product amounts two orders of the magnitude

KEY WORDS: fusion plasma, ignition, confinement, time evolution, tritium removal, fuel rates scenarios.

COINCIDENCE LIMIT AND GENERALIZED INTERACTION TERM STRUCTURE IN MULTIGRAVITY

S.A. Duplij, A.T. Kotvytskiy

Full Text :   (180 kB, Rus.) 

Abstract
The generalized structure of the interaction term of multigravity is analyzed in detail. The coincidence limit of any multigravity theory is defined and the compatibility equation for the interaction potential is derived which is studied in the weak perturbation limit of metric. The most general properties of the invariant volume and the scalar potential of multigravity are investigated. The general formula for multigravity invariant volume using three means (arithmetic, geometric and harmonic) is derived. The Pauli-Fierz mass term for bigravity in the weak field limit is obtained.

KEY WORDS: coincidence limit, compatibility equation, invariant volume, weak field limit, scalar potential.

APPLICATION OF PHOTON ACTIVATION METHOD TO THE INVESTIGATION OF AGE TREND IN ELEMENT CONTENT OF CHILD’S HEAR

I.I. Zalyubovsky, N.P. Dikiy, E.P. Medvedeva, I.D. Fedorets, T.V. Frolova, S.P. Shklyar

Full Text :   (530 kB, Rus.) 

Abstract
Results of the application of photon activation method to the determination of element content in child's hear depending on age, sex and some somatic diseases are presented. The hair samples by weight about 1g each of have been collected from 205 pupils (95 male and 110 female, age range 9-16 y) from one of the suburban schools and were irradiated by the bremsstrahlung using the 700 mA, 25 MeV electron beam from the high-power electron accelerator. The detection limit was ranged from 10^-5 % mass (for Ca and Pb) to 10^-7 % mass (for I). Within the present context, serious consideration has been paid to studies of the analytical scope of this method. It has been shown that with suitable development of experimental techniques, photon activation method can be applied with advantage not only for analysis of biological materials but also and for revealing and research of prepatological conditions of biological systems.

KEY WORDS: photon activation method, element analysis, bremsstrahlung, hair samples, detection limit.

THE ELECTRON BEAM LINES FROM SALO RECIRCULATOR TO PHYSICAL INSTALLATION

A.N. Dovbnya, V.B. Ganenko, I.S. Guk, S.G. Kononenko, A.S. Tarasenko

Full Text :   (340 kB, Rus.) 

Abstract
The arrangement of designing physical installations, which will use the beams of SALO recirculator - the base facility of INF&HE NSC KIPT, is shown. The requirements to parameters of beam extracted into experimental setups, which follow from the offered research program, are formulated. Magneto-optical structures of particle extraction channels, which provide required parameters of the beam on physical targets, are chosen. The calculated for these channels the beam envelopes are resulted and influence of inaccuracy of the beam input into the beam lines on its deviation from ideal trajectory is investigated.

KEY WORDS: recirculator, electron accelerator, magnet, quadrupole, corrector.

THE SYSTEMS OF TOLERANCES, CORRECTION AND INDICATION OF MAGNETOOPTICAL STRUCTURE SALO RECIRCULATOR

I.S. Guk, S.G. Kononenko, A.S. Tarasenko

Full Text :   (390 kB, Rus.) 

Abstract
From the point of view of optimization of the tolerances on exactitude of magnetic elements alignment and optimization of the beam position correction system the conception of choice of the magneto-optical system of SALO facility is chosen. The combined modular and individual method of magnetic elements alignment is chosen. By numerical simulation the system of the beam correction is chosen and its efficiency is investigated. The values of adjustment accuracy of magnetic elements and the requirements to parameters of beam position indication system are submitted.

KEY WORDS: recirculator, electron accelerator, adjustment, correction, magnet.

METHODS OF CHARGE TRANSPORT PARAMETER DETERMINATION FOR CdTe (CdZnTe) GAMMA-RADIATION DETECTORS

A.A. Zakharchenko, V.E. Kutny, D.V. Nakonechny, I.M. Prokhoretz, A.V. Rybka, M.A. Khazhmuradov

Full Text :   (490 kB, Rus.) 

Abstract
A comparative analysis of the methods intended to determine the charge transfer parameters (μτ)_e and (μτ)_h in active media of spectrometry and dosimetry high-resistivity semiconductor detectors is presented. A problem is studied how to determine these parameters in planar CdTe (CdZnTe) gamma-ray detectors using their experimental dosimetry characteristics and the results of computer gamma-spectra simulation. A technique is developed allowing to find out transport parameters of the tested detectors with the use of the measurement of the charge collection efficiency in low-energy spectral range (e.g., with 59.54 keV ²⁴¹Am peak), measurement of the detector response in high-energy range (e.g., with line 661.67 keV ¹³⁷Cs peak) and comparing these data with the results of simulation. The proposed method can be applied to the development of new spectrometric and dosimetry radiation safety devices and to the operative testing of such devices working in high-intensity radiation fields.

KEY WORDS: CdTe, CdZnTe, detector, gamma-radiation, mobility, life time, charge collection efficiency, Monte-Carlo method.

LOW-BACKGROUND SPECTROMETER ALPHA-ACTIVITY OF DIFFERENT LARGE SAMPLES

Yu.M. Gavriljuk, A.M. Gangapshev,V.V. Kazalov, V.V. Kuzminov, S.I. Panasenko, S.S. Ratkevich, I.D. Fedorets

Full Text :   (800 kB, Rus.) 

Abstract
The construction of an ion pulse ionization chamber aimed at measuring levels of surface alpha-activity of different samples is described. Created on a basis the ionization chamber the low-background spectrometer together with corresponding methods of registration and processing of signals allows to achieve high sensitivity of direct measurements of midget levels of superficial alpha-activity. Allows to solve a problem of the control of superpure materials, with the broken balance in a circuit of disintegrations of the uranium and thorium decay chains used at creation of detectors for research of rare nuclear processes. The results of modeling of pulses of a current are with depending on orientation and site of tracks of alpha-particles in the chamber are given. The results of measurement carried out with alpha-source, and also with copper samples, stainless steel and light-reflecting film VM2000 are presented.

KEY WORDS: alpha-particle, track, structure, pulse ionization chamber, form of a pulse, modeling, superficial alpha-activity.

EFFECTS OF LIGHT SCATTERING IN THE PLASTIC SCINTILLATOR

N.P. Khlapova, J.S. Shpilevoy, V.G. Senchishin, A.P. Gavrik, N.S. Lutsay, V.N. Lebedev

Full Text :   (390 kB, Rus.) 

Abstract
The experiments were fulfilled on a series of PS samples differing by regime of polymerization process. The computational analysis of optical losses in the plastic scintillator on a polystyrene basis of standard mixture (98,5%PST + 1,5% p-TP + 0.02% POPOP) was carried out. The results of measurement of spectral scattering, bulk attenuation length and the level of internal strains in the PS samples are presented.The possibility of quantitative estimation of contribution of absorptive losses - Raylegh scattering and Love-Mie scattering to the summary optical losses of PS was shown .The observed drastic reduction of Relay component of losses (from 1850 to 380 dB/km) in the samples with "excess" annealing may be explained by decrease of local heterogeneity of polymer matrix of the present PS samples, due to the decrease of internal "frozen" macromolecular deformations in them.

KEY WORDS: plastic scintillator, transparency, modelling of spectral losses, light scattering, internal strains, high-temperature annealing.

VACUUM ARC PLASMA PARAMETERS AND THE FEATURES OF TiN COATING DEPOSITION PROCESS FOR SMALL DIMENSION SAMPLES

V.M. Khoroshikh, S.A. Leonov, V.A. Belous, G.I. Nosov, G.N. Kurilenko

Full Text :   (400 kB, Rus.) 

Abstract
Probe investigations of vacuum arc plasma parameters for the discharge with titanic cathode at presence of nitrogen in the vacuum chamber volume were provided. The features of coating deposition process for small dimension samples are studied (of order sheath thickness on border plasma - condensation surface). Investigations showed that with gas pressure growth in a discharge ambient there is plasma concentration multiplying, conditioned the decreasing of metal ions energy at collisions with the gas particles. The collisions of metal ions with the gas molecules result to plasma chaotization. The decreasing of ions energy and plasma stream chaotization leads to high coating deposition rate of titanium nitride films for small dimension samples at nitrogen pressure ~ 1,5...2 Pa. At nitrogen of pressures ~ 1, 5...2 Pa it is necessary to take into account samples mutual influencing on each other.

KEY WORDS: vacuum arc, coating deposition, probe investigations, substrate geometry, plasma flux, plasma concentration, ion energy.

MOTION OF RELATIVISTIC CHARGES IN THE CONSTANT ELECTROMAGNETIC FIELD OF A CYLINDRICAL CAPACITOR AND A LINEAR CURRENT FLOWING ALONG ITS AXIS

Yu.A. Kirochkin, A.Yu. Kirochkin

Full Text :   (200 kB, Rus.) 

Abstract
The trajectories of motion of the relativistic charged particles in constant radial electric and azimuthal magnetic fields are obtained. It is shown that at certain conditions motion of positive and negative charges can take a place on the identical closed trajectories. The usability condition of nonrelativistic trajectories is found. Possibility of formation of vortex rings of positive and negative charges and their confluence in one vortex ring is discussed.

KEY WORDS: electromagnetic field, charge, motion, trajectory, vortex.

SPECTRAL CHARACTERISTICS OF VVER-1000 SPENT NUCLEAR FUEL WHICH IS INTENDED FOR A DRY STORAGE KEEPING

S.A. Pismenetskiy, V.B. Pyshkin, V.G. Rudychev, D.V. Rudychev

Full Text :   (500 kB, Rus.) 

Abstract
A program code package SpectrOJAT has been worked out on the base of JEF-2.2 fibs, which provides a calculation of gamma-ray spectrum from an arbitrary set of radionuclides. These spectra can be obtained both in a given energy intervals and for the set of fixed average energies for a needed time moment. For the irradiated nuclear fuel which will have to keep in dry depository, a comparison has been made of two spectra - after SpectrOJAT procedure and after FISPACT code application. After JEF-2.2 base modification a good agreement has been obtained in full energy region. The spectra from an irradiated fuel were obtained in a form required for a subsequent calculation of the cask shield properties. A time dependence of obtained spectra has drastic downfall for high energy end.

KEY WORDS: irradiated nuclear fuel, spent fuel storage gamma-ray spectrum, VVER-1000, particularities of long-time keeping.

SUPERHIGH FREQUENCY PLASMA SOURCE

V.V. Vlasov

Full Text :   (400 kB, Rus.) 

Abstract
The method of the calculation parameter cylindrical resonator is presented in the work, which is used as SHF source of the plasma in magnetic field. The results of the study of the conditions of existence SHF discharge at pressure worker gas (the air) of the order 10^-5 torr is presented in the work too. The conditions of the ignition discharge at electronic cyclotron resonance is determined experimentaly. It is shown, that with its help plasma with density not below 10¹⁰ cm^-3, with the maximal density of currents in a stream about 600 мкА/cm² is created.

KEY WORDS: plasma source, SHF oscillation generator, external spatially-inhomogeneous magnetic field, SHF electromagnetic field, electron cyclotron resonance, plasma density.

COMPUTER CODE GAMMAPEAKS FOR TREATMENT OF γ-SPECTRA

A.Yu. Berezhnoy, S.N. Utenkov

Full Text :   (330 kB, Rus.) 

Abstract
The computer program GAMMAPEAKS (version 1.0) intended for treatment of γ-spectra, received as a result of the nuclear reactions experimental researches is developed. The basic characteristics and principles of work of presented program are given. The program bases on the peaks approximation with the gauss function having the variable dispersion. It provides energy calibration of spectrum. The main characteristics and principles of work present program are given.

KEY WORDS: nuclear reactions, γ-spectra, computer modeling, energy calibration, reaction cross section, radiation power function.