Results 1 - 10 of 1933
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[en] History, state-of-the-art, and the planned development of the high-energy and heavy-ion accelerators at the Joint Institute for Nuclear Research at Dubna are reviewed. Data on the particle beams available at present and in the future are given. (author)
[en] In 2010, based on the superconducting synchrotron Nuclotron, a new accelerator complex NICA (Nuclotron based Ion Collider fAcility) started to be constructed at the Laboratory of High Energy Physics of the Joint Institute for Nuclear Research, its key facility being the 1.0-4.5 GeV per nucleon heavy ion collider. For the purpose of effectively collecting statistics, an average collider luminosity of 10"2"7 cm"-"2s"-"1 is required. With this collider energy, the cooling of the beam both in the process of storage and during the experiment is mandatory to ensure the required parameters. In this paper, a possible new regime of stochastic cooling is examined.
[ru]В 2010 г. в Лаборатории физики высоких энергий Объединенного института ядерных исследований (ОИЯИ) началось сооружение на основе сверхпроводящего синхротрона тяжелых ионов 'Нуклотрон' нового ускорительного комплекса NICA (Nuclotron based Ion Collider fAcility). Основной экспериментальной установкой комплекса является коллайдер с энергией сталкивающихся пучков тяжелых ионов от 1 до 4,5 ГэВ на нуклон. Для эффективного набора статистики требуется средняя светимость коллайдера на уровне 10"2"7 см"-"2c"-"1. Для того чтобы обеспечить требуемые параметры в коллайдерах с такой энергией, необходимо охлаждение пучков как при накоплении, так и в процессе эксперимента. Представлены результаты исследования возможности применения стохастического охлаждения пучков в новом режиме.
[en] A brief review of research at the Joint Institute for Nuclear Research (JINR) is given. Topics included are theoretical physics, elementary particle physics, nuclear physics, the IBR fast-neutron pulse reactor accelerator facilities and international scientific co-operation. (U.K.)
[en] The scientific activity and review of results attained at Florov Nuclear Reactions Laboratory of the Joined Institute of Nuclear Research, Dubna, have been presented in historical order. Especially the heavy ion cyclotron use for synthesis of new super-heavy elements as well as investigations of their physical and chemical properties have been shown. 1 fig
[en] Research in the field of accelerator techniques has been going on at the laboratory of Nuclear Reactions for more than 30 years. The development of accelerator facilities has been aimed at a program of scientific research in the field of heavy ion physics. At present, several cyclotrons are operating at the Laboratory, -the cyclic implanter CI-100 (pole diameter 1m) - the cyclotron U-200 (pole diameter 2m) -the cyclotron U-400 (pole diameter 4m) - the cyclotron U-400M (pole diameter 4m). Works is also underway on the start-up of the cyclotron complex U-400 + U-400M and on the development of the storage complex K4 + K10. (Author)
[en] Full text: At the annual session of the Plenipotentiaries Committee of the Joint Institute for Nuclear Research (JINR), Dubna, near Moscow in March, Institute Director Vladimir G. Kadyshevsky reported on important recent achievements. The Nuklotron superconducting accelerator has now been completed and is in operation. (A report will feature in a forthcoming edition of the CERN Courier.) The FOBOS multiple event spectrometer mounted in the heavy ion beam of the U-400M cyclotron is designed to record the products of nuclear reactions in the high mass and charge region with high efficiency. New experiments are envisaged. At the IBR research reactor a cryogenic moderator has been put into operation. Physics goals include generation of an impulse flux of cold neutrons. The neutron Fourier high resolution diffractometer was commissioned for polycrystal studies. Meanwhile an imaginative scheme to establish an International University using JINR research facilities and highly qualified personnel is being implemented. New appointments include Alexei Sissakian and Tzvetan Vylov as Vice-Directors, Nikolai Russakovitch as Chief Scientific Secretary, Vladislav Sarentzev as Chief Engineer and Alexandre Lebedev as Administrative Director. Western physicists elected members of JINR Scientific council include Ugo Amaldi and Lucien Montanet from CERN, Claude Detraz (IN2P3, Paris), Friedrich Dydak (Munich), Guido Piragino (Italy), George Trilling (Berkeley), Herwig Schopper (Germany) and Norbert Kroo (Hungary). Earlier this year saw the 80th birthday of Venedikt Dzhelepov, Honorary Director of JINR's Laboratory of Nuclear Problems
[en] A stationary system for the identification of hidden explosives was developed and constructed at the Joint Institute for Nuclear Research (JINR). The results of the examination of the system, as well as the operation principle of the system and design of the main elements are presented.
[en] The major basic facilities of JINR are the Nuclotron - a superconducting accelerator of relativistic nuclei, the U-400, U-400M and U-200 heavy ion cyclotrons, the Synchrophasotron - a 10 GeV proton and light nuclei accelerator, the Phasotron - a 680 MeV proton accelerator, the IBR-2 fast neutron pulsed reactor and the IBR30 neutron pulsed booster multiplier. These nuclear facilities generate the different types of radiation fields with wide energy range and complex composition. The main radiation component of the fields behind thick biological shielding is neutron with energy from thermal up to several hundreds of MeV. The energy spectra of these neutrons vary widely, depending on the type and design of the facility and its shielding. Development of broad energy range neutron spectrometry techniques for measurements in mixed scattered radiation fields is the one of the prior topics in radiation protection. There are no experimental techniques to cover an entire neutron energy range, but the problem can be solved by the combining the measurements with a set of different spectrometers. The key information for efficient accelerator shielding design is true determination of the source term. Double differential (on angle and energy) distributions of neutrons produced by primary partides in thick targets which imitate the construction parts of accelerators are the crucial data to define the source term. There is a lack of such experimental information available especially for heavy ions. This presentation is intended to give the flavor of our work on the problems, its objectives, range of interests and methods. (author)