S. L. Yakovenko

Publications (7)0.59 Total impact

• Article: A cryogenic source of slow monochromatic positrons

  I. N. Meshkov, V. N. Pavlov, A. O. Sidorin, S. L. Yakovenko
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  ABSTRACT: A cryogenic source of slow monochromatic positrons based on 22Na radioactive isotope has been developed and produced at the Joint Institute for Nuclear Research. A monochromatic beam is formed from a continuous β+ spectrum with energies of 0–0.5 MeV using a solid neon moderator frozen onto a copper substrate that is cooled to temperatures of 5–7 K. The efficiency of condensation of neon onto the substrate is >99.8%. A slow positron beam with an intensity of 5.8 × 103 particles/s and a mean energy of 1.2 eV at a spectrum width of 1 eV has been extracted from a 22Na-based test source. The fraction of decelerated positrons is 1% of the total flux.
  Instruments and Experimental Techniques 05/2012; 50(5):639-645. · 0.36 Impact Factor
• Article: Development of the Low Energy Particle Toroidal Accumulator project

  E. V. Akhmanova, V. F. Bykovskii, M. K. Esseev, A. G. Kobets, V. I. Lokhmatov, I. N. Meshkov, V. N. Pavlov, R. V. Pivin, A. Yu. Rudakov, A. A. Sidorin, S. L. Yakovenko
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  ABSTRACT: The Low Energy Particle Toroidal Accumulator (LEPTA), a positron storage ring with electron cooling, was constructed and put in operation at the Joint Institute for Nuclear Research (Dubna). The storage ring is a generator of directed beams of ortho-positronium (o-Ps) produced upon the recombination of the beam of positrons circulating in the storage ring with a single-pass electron beam. In 2004 the storage ring was put in operation with the circulating electron beam. The source of positrons of the positron injector was tested with a new radioactive source delivered from South Africa. The positron trap was put in operation for electrons. The electron cooling system was tested with a pulsed electron beam. The progress in commissioning LEPTA is described in this paper.
  Physics of Particles and Nuclei Letters 04/2012; 7(7):502-506.
• Article: Storage ring with longitudinal magnetic field LEPTA (Stellatron)

  E. V. Boltushkin, V. F. Bykovskii, A. G. Kobets, Yu. V. Korotaev, V. I. Lokhmatov, V. N. Malakhov, I. N. Meshkov, V. N. Pavlov, R. V. Pivin, I. A. Seleznev, A. O. Sidorin, A. V. Smirnov, E. M. Syresin, G. V. Trubnikov, S. L. Yakovenko
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  ABSTRACT: The project of the Low Energy Particle Toroidal Accumulator (LEPTA) is dedicated to the construction of a positron storage ring with electron cooling of positrons circulating in the ring. Such a specific feature of LEPTA automatically enables it to be a generator of positronium (Ps) atoms, which appear in the recombination of positrons with cooling electrons inside the cooling section of the ring. The project has the following goals: particle dynamics in the modified betatron, electron cooling with a circulating beam, positronium generation in flight, positronium physics, and feasibility of antihydrogen generation in flight. All key elements of the ring—the kicker, electron beam injection system, helical quadrupole, septum magnet—have been tested, and the expected design parameters have been achieved for these elements. The construction of LEPTA has been completed, and the circulating electron beam has been achieved. This paper discusses the issues of particle dynamics in such an accelerator, the results of numerical simulation and experimental findings of the research into beam dynamics, measurement of betatron number and beam lifetime.
  Physics of Particles and Nuclei Letters 11/2006; 3:S46-S49.
• Article: Perspectives of LEPTA

  A. G. Kobets, Yu. V. Korotaev, I. N. Meshkov, R. V. Pivin, I. A. Seleznev, A. O. Sidorin, A. V. Smirnov, G. V. Trubnikov, S. L. Yakovenko
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  ABSTRACT: The Low Particle Toroidal Accumulator (LEPTA) project is under development at JINR. The ring assembling is completed. The test experiments with circulating electron beam are in progress and the results are presented. Assembling and test of the positron injector is started. The program of experiment on directed o‐Ps flux generated at LEPTA is listed in the report. The first experiment that is under preparation presently has the goal to measure p‐Ps life time by interference of ortho‐ and para‐ states of Ps in magnetic field. © 2005 American Institute of Physics
  AIP Conference Proceedings. 10/2005; 796(1):399-405.
• Article: Physical Startup of the LEPTA Accumulator

  E. V. Boltushkin, A. G. Kobets, Yu. V. Korotaev, V. I. Lokhmatov, V. N. Malakhov, I. N. Meshkov, R. V. Pivin, I. A. Seleznev, A. O. Sidorin, A. V. Smirnov, E. M. Syresin, G. V. Trubnikov, S. L. Yakovenko
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  ABSTRACT: The LEPTA setup (Low Energy Particle Torroidal Accumulator) is being constructed at the Joint Institute of Nuclear Research. The main purpose of this setup is to generate intense fluxes of positronium ions and perform experiments in positronium physics. The main component of the setup is the low-energy positron accumulator with a electronic cooling system. A special feature of the accumulator is that it uses a longitudinal magnetic field to focus a circulating beam. The physical startup of the accumulator was performed in September 2004. The results of the adjustment of the main components of the accumulator, the method for obtaining a circulating beam, and the first results of measurements of its parameters are presented.
  Atomic Energy 01/2005; 98(3):217-226. · 0.08 Impact Factor
• Article: Low-Energy Positron Injector

  V. K. Antropov, A. V. Ivanov, Yu. V. Korotaev, I. N. Meshkov, V. N. Pavlov, I. A. Seleznev, A. O. Sidorin, A. V. Smirnov, E. M. Syresin, G. V. Trubnikov, S. L. Yakovenko
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  ABSTRACT: The LEPTA low-energy positron accumulator, which is to be used for producing directed fluxes of positronium and antihydrogen atoms, is under development at the Joint Institute of Nuclear Research. The monochromatic positron injector, operating in the pulsed mode, in the accumulator must generate a positron beam with intensity 108–109 particles in a pulse with duration less than 300 nsec, the positron energy is 10 keV, the relative energy spread in the beam is less than 210–3, and the beam radius is 0.5 cm.Radioactive 22Na serves as a positron source. The positrons at the exit from the source are decelerated in a solid target and enter the magnetic trap. There they are once again decelerated in a gas to thermal velocity and accumulate in ~100 sec. For injection into the accumulator, the positrons are pulled out of the trap by a pulsed electric field and acclerated up to the required energy.
  Atomic Energy 12/2002; 94(1):36-38. · 0.08 Impact Factor
• Article: Low-Energy Positron Accumulator for Generating Directed Positron Fluxes (LEPTA Project)

  V. K. Antropov, E. V. Boltushkin, A. V. Ivanov, S. A. Ivashkevich, V. V. Kalinichenko, Yu. V. Korotaev, V. I. Lokhmatov, I. N. Meshkov, I. A. Seleznev, A. O. Sidorin, A. V. Smirnov, E. M. Syresin, G. V. Trubnikov, S. L. Yakovenko
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  ABSTRACT: The LEPTA (Low Energy Particle Toroidal Accumulator) under construction at the Joint Institute of Nuclear Research is described. The goal of this project is to produce a small accumulator for 10-keV positrons with electronic cooling of the circulating positron beam. The main purpose of the accumulator is to generate an intense flux of the electron–positron ground state, so-called positronium. The parameters of the first experiments on a positronium flux and the current status of the work on this project are discussed.
  Atomic Energy 12/2002; 94(1):21-23. · 0.08 Impact Factor