27 research outputs found
Ground states of a one-dimensional lattice-gas model with an infinite range nonconvex interaction. A numerical study
We consider a lattice-gas model with an infinite range pairwise noncovex
interaction. It might be relevant, for example, for adsorption of alkaline
elements on W(112) and Mo(112). We study a competition between the effective
dipole-dipole and indirect interactions. The resulting ground state phase
diagrams are analysed (numerically) in detail. We have found that for some
model parameters the phase diagrams contain a region dominated by several
phases only with periods up to nine lattice constants. The remaining phase
diagrams reveal a complex structure of usually long periodic phases. We also
discuss a possible role of surace states in phase transitions.Comment: 16 pages, 5 Postscript figures; Physical Review B15 (15 August 1996),
in pres
Comissioning of the linear accelerator-injector at the TNK facility
The industrial storage facility has been developed and manufactured at the Budker INP SB RAS. It contains an
80 MeV electron linear accelerator-injector and two electron storage rings: the lesser 450 MeV booster ring and the
main 2.5 GeV storage ring. In 2002, the work on the accelerator assembling was begun. On December, 25 this year
the accelerator was started up, and the current at the linear accelerator output was obtained. The linear accelerator
schematic together with a description of the 6 meter long accelerating DAW structure which operates at 2.8 GHz,
are presented in the paper. The first results of the accelerator start-up are as follows: the accelerated electron current
of ~50 mA with the energy of ~55...60 MeV.Технологічний накопичувальний комплекс був спроектований і виготовлений у ІЯФ ім. Г.І. Будкера СВ
РАН. Він містить у собі інжектор–лінійний прискорювач електронів з енергією до 80 МеВ і два
накопичувачі електронів: малий накопичувач–бустер на енергію 450 МеВ і основний накопичувач на
енергію 2.5 ГеВ. Приводяться функціональна схема лінійного прискорювача й опис конструкції
прискорюючої структури із шайбами і діафрагмами довжиною 6 м, що працює на частоті 2.8 ГГц.Представлено перші результати запуску прискорювача: отриманий прискорений струм електронів ~50 мА з
енергією ~(55...60) МеВ.Технологический накопительный комплекс был спроектирован и изготовлен в ИЯФ им. Г.И. Будкера СО
РАН. Он включает в себя инжектор–линейный ускоритель электронов с энергией до 80 МэВ и два накопителя
электронов: малый накопитель–бустер на энергию 450 МэВ и основной накопитель на энергию 2.5 ГэВ. Приводятся функциональная схема линейного ускорителя и описание конструкции ускоряющей структуры с
шайбами и диафрагмами длиной 6 метров, работающей на частоте 2.8 ГГц. Представлены первые результаты
запуска ускорителя: получен ускоренный ток электронов ~50 мA с энергией ~(55...60) МэВ
Single-file diffusion in oxygen underdoped ReBa₂Cu₃O₇₋ₓ (Re=Y, Ho) single crystals
Analysis of the kinetics of relaxation processes observed at room temperature in the ReBa₂Cu₃O₇₋ₓ (Re=Y, Ho) compounds, having a high-temperature superconductivity is made. It was concluded that the initial (faster) stage of these processes is controlled by a single-file diffusion of oxygen along one-dimensional chains of vacancies, forming in the oxygen sub-lattice of compound with a deficit of oxygen, and final (slow) stage controls by the usual classical diffusion. Presented and discussed the results of two-stage relaxation of the electrical resistance of above mentioned compounds which were a long time (more than three days) at room temperature in air