Перегляд за автором "Kushnir, V.A."

Сортувати за: Порядок: Результатів:

  • Experimental study of characteristics of intense electron beam injector 
    Aizatskyi, M.I.; Khodak, I.V.; Kushnir, V.A.; Mytrochenko, V.V.; Perezhogin, S.A.; Stepin, D.L.; Zhiglo, V.F. (Вопросы атомной науки и техники, 2013)
    Application of low voltage electron source requires the use of steep change of on-axis RF field along the buncher for electrons to be bunched and accelerated efficiently. The paper presents the results of studies of the ...
  • Experimental study of secondary emission mode in RF gun with thermionic cathode 
    Khodak, I.V.; Kushnir, V.A.; Mitrochenko, V.V.; Perezogin, S.A.; Stepin, D.L. (Вопросы атомной науки и техники, 2004)
    The paper deals with the problems concerning the influence of secondary emission on the operation of radio frequency (RF) gun with thermionic cathode. The characteristics of particles bombarding the cathode are investigated by ...
  • High-current hollow beam dynamics in RF electron guns 
    Khodak, I.V.; Kushnir, V.A.; Mitrochenko, V.V. (Вопросы атомной науки и техники, 2004)
    RF electron guns with a metal-dielectric cathode are able to generate intense beams with nanosecond current pulse duration. The plasma developed during the dielectric surface flashover in vacuum is the source of particles ...
  • High-temperature metallic cathode for RF gun 
    Biller, E.Z.; Khodak, I.V.; Kushnir, V.A.; Mitrochenko, V.V.; M'akushko, L.K.; Stepin, D.L.; Zhiglo, V.F. (Вопросы атомной науки и техники, 2001)
    In the paper a metallic thermionic cathode with an electron beam heating to be used in RF gun is proposed. The high-temperature metallic emitter made of high-melting material will allow to decrease significantly the pulse ...
  • Higt-frequency electron guns – current status 
    Kushnir, V.A. (Вопросы атомной науки и техники, 1999)
    The high-frequency guns with thermoionic cathode are effective sources of electrons for linear accelerators. The work on perfecting these sources of electrons actively proceeds now in many laboratories of the world. The ...
  • Influence of high-energy electrons irradiation on nanoceramics properties of zirconia 
    Aizatskyi, M.I.; Dikiy, N.P.; Dovbnya, A.N.; Fedorets, I.D.; Kushnir, V.A.; Lyashko, Yu.V.; Medvedev, D.V.; Mytrochenko, V.V.; Onishchenko, I.N.; Perezhogin, S.A.; Pelichatyi, N.M.; Danilenko, I.A.; Konstantinova, T.E. (Вопросы атомной науки и техники, 2013)
    Radiation defects in nanoceramics zirconia were investigated after electron irradiation with energy 41…89 MeV up to doze 2.28…5.7·10¹⁴ electrons/cm². Radioactive isotopes ⁸⁷,⁸⁸Y, ⁸⁸,⁸⁹,⁹⁵Zr, ⁹⁵Nb, ¹⁷⁵Hf are registered after ...
  • Investigation of stability electron beam parameters in sources with cold secondary-emission cathodes 
    Dovbnya, A.N.; Ayzatsky, N.I.; Boriskin, V.N.; Zakutin, V.V.; Kushnir, V.A.; Mitrochenko, V.A.; Reshetnyak, N.G. (Вопросы атомной науки и техники, 2004)
    The investigation into the generation of tubular electron beams and their parameters in a system of secondaryemission cathodes was carried out. The parameters of electron beams with the use of a multichannel measuring ...
  • Investigation of the hollow beam structure on optical transition radiaton 
    Ayzatsky, M.I.; Kushnir, V.A.; Mytrochenko, V.V.; Opanasenko, A.; Zhiglo, V. (Вопросы атомной науки и техники, 2004)
    The features of studying the structure of a dense annular beam with OTR from metal targets at electron energy ≤ 50 keV are described. The image of the cross section of the annular beam with sub-millimeter wall thickness ...
  • Investigation of the hollow beam structure on optical transition radiaton 
    Ayzatsky, M.I.; Kushnir, V.A.; Mitrochenko, V.V.; Opanasenko, A.M.; Zhiglo, V.Ph. (Вопросы атомной науки и техники, 2004)
    In this paper we represent the experimental data on measurement of the transverse current density distribution of the annular beam with the sub-millimeter wall thickness. A digital photo camera was used to increase sensibility ...
  • Isomer ratios in photonuclear reactions with multiple neutron emission 
    Vodin, O.M.; Bezshyyko, O.A.; Golinka-Bezshyyko, L.O.; Kadenko, I.M.; Kushnir, V.A.; Kotenko, A.V.; Lubynets, O.V.; Mitrochenko, V.V.; Olejnik, S.M.; Perezhogin, S.A.; Vallerand, C. (Вопросы атомной науки и техники, 2019)
    The aim of this work is studying of gamma-quanta energy dependence of isomeric ratios in A(γ,xn)m,g(A − r n) reactions in energy range 35...100MeV , i.e. beyond Great Dipole Resonance (GDR) region. Experimental data were ...
  • Isomer ratios of photonuclear reaction products on silver and indium isotopes for bremsstrahlung energies above 35 MeV 
    Bezshyyko, O.A.; Dovbnya, A.N.; Golinka-Bezshyyko, L.O.; Kadenko, I.M.; Kulakov, I.S.; Kushnir, V.A.; Mitrochenko, V.V.; Olejnik, S.N.; Tuller, G.E.; Vodin, A.N. (Вопросы атомной науки и техники, 2009)
    Isomer ratios were obtained for nuclei 104m,gAg and 110m,gIn-products of reactions 107Ag(γ,3n)104m,gAg and 113In(γ,3n)110m,gIn after bremsstrahlung irradiation with maximum energies 35 and 36 MeV , respectively. ...
  • Magnetic system for cleaning the gamma beam at the LUE-40 electron linac output 
    Mytrochenko, V.V.; Perezhogin, S.O.; Selivanov, L.I.; Zhyglo, V.Ph.; Vodin, A.N.; Deiev, O.S.; Olejnik, S.M.; Timchenko, I.S; Kushnir, V.A. (Вопросы атомной науки и техники, 2022)
    The bremsstrahlung of accelerated electrons passing through a converter is used to study multiparticle photo-nuclear reactions. The results of calculations, numerical modeling, design, and testing of a special magnetic ...
  • Main systems development of K-band linac 
    Ayzatsky, M.I.; Biller, E.Z.; Dovbnya, A.N.; Kushnir, V.A.; Mitrochenko, V.V.; Perezhogin, S.A.; Khodak, I.V. (Вопросы атомной науки и техники, 1999)
    The main purpose of our work is the creation of the small-sized linear electron accelerator on the energy up to 5 MeV on the base of such low-power Х- and K-bands sources. In this paper the results on development of main ...
  • Measurement of phase-energy electron distribution at the RF gun exit using alfa-magnet 
    Kushnir, V.A.; Mitrochenko, V.V. (Вопросы атомной науки и техники, 2004)
    The paper presents the results of measuring the electron phase-energy distribution at the exit of the S-band nanosecond photo RF gun. The RF gun is the electron source of the injector system of linac LU-60. The main bunching ...
  • Method of electron emission control in RF guns 
    Khodak, I.V.; Kushnir, V.A. (Вопросы атомной науки и техники, 2001)
    The electron emission control method for a RF gun is considered. According to the main idea of the method, the additional resonance system is created in a cathode region where the RF field strength could be varied using ...
  • Multichannel system for research of secondary emission pulse electron beam generation 
    Ayzatsky, N.I.; Boriskin, V.N.; Gurin, V.A.; Kushnir, V.A.; Mitrochenko, V.V.; Reshetnyak, N.G.; Romas’ko, V.P.; Savchenko, A.N.; Zakutin, V.V. (Вопросы атомной науки и техники, 2004)
    To carry out crossed-field secondary emission electron sources scientific-research developments we have designed and manufactured a 12-channel information measuring system. A hardware complex of the multichannel pulse-signal ...
  • NSC KIPT positron source. Pre-project research 
    Bulyak, E.V.; Dovbnya, A.N.; Kushnir, V.A.; Mytrochenko, V.V.; Perezhogin, S.A.; Opanasenko, A.N. (Вопросы атомной науки и техники, 2020)
    We present the results of theoretical and numerical studies on the source of slow positrons for NSC KIPT. The positrons are intended to generate with the electrons of 9, 40 or 90 MeV available at the KIPT electron linacs. ...
  • On a method of tuning of couplers for electron LINACS based on disk loaded waveguides 
    Aizatskyi, N.I.; Kramarenko, K.Yu.; Khodak, I.V.; Kushnir, V.A.; Mytrochenko, V.V.; Opanasenko, A.M.; Perezhogin, S.A.; Selivanov, L.I.; Zhiglo, V.F. (Вопросы атомной науки и техники, 2015)
    The article presents an adjustment procedure for an input and output couplers of a traveling wave accelerating section based on cylindrical disk loaded waveguide (CDLW). The procedure consists in bead pull measurement of ...
  • On creation of a cathode units for the X -band klystron using a high-current magnetron gun as a base 
    Dovbnya, A.N.; Ayzatsky, N.I.; Boriskin, V.N.; Zakutin, V.V.; Kushnir, V.A.; Mitrochenko, V.A.; Reshetnyak, N.G.; Perezhogin, S.A.; Stepin, D.L. (Вопросы атомной науки и техники, 2004)
    The article presents the results from studies, performed at the R&D “Accelerator” NSC KIPT, on development of units for the X-band klystron with an output power 1...2 MW and at a voltage 50...100 kV. A magnetron gun with ...
  • On transversal instability of beam in powerful S-band linear electron accelerators 
    Aizatsky, M.I.; Kramarenko, E.U.; Khodak, I.V.; Kushnir, V.A.; Mytrochenko, V.V.; Perezhogin, S.A. (Вопросы атомной науки и техники, 2006)
    High pulse current of electrons in a linear resonance accelerator assists the increase of overall efficiency of the facility. At the same time, there is a danger of development of transversal instability of a beam (BBU), ...