Василий Васильевич Пархомчук (к 70-летию со дня рождения), Бондарь А.Е., Деревянко А.П., Диканский Н.С., Иванов С.В., Кулипанов Г.Н., Левичев Е.Б., Логачев П.В., Мешков И.Н., Салимов Р.А., Скринский А.Н., Трубников Г.В., Шатунов Ю.М.

Александр Евгеньевич Бондарь (к 60-летию со дня рождения), Винокуров Н.А., Диканский Н.С., Кулипанов Г.Н., Логачев П.В., Онучин А.П., Пархомчук В.В., Рубаков В.А., Скринский А.Н., Тихонов Ю.А., Шатунов Ю.М., Шварц Б.А., Эйдельман С.И.

Barkov turned 80. These days he is a chief researcher at the G I Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences (RAS). One of a galaxy of brilliant physicists of the first graduating class of the Physico-Technical Department of Moscow State University (today the Moscow Institute of Physics and Technology), L M Barkov began to work at USSR Academy of Sciences Laboratory No. 2, which later became the worldwide-known I V Kurchatov Institute of Atomic Energy (today known as theRussianResearchCentre `Kurchatov Institute'), already when he was a second-year student. At the time, his interests lay in the field of measurements of the energy spectra of neutrons that emerge in the fission of uranium and plutonium isotopes and the study of their moderation and diffusion in uranium ±water systems. All this work was closely related to a plan of building uranium and heavy water nuclear reactors destined for defense industry and national economy. During the same period in his scientific career, Lev Barkov became interested in high-energy physics. From 1952 up to the end of the 1950s, he actively participated in work on measuring the pionization cross sections and studying the dynamics of interaction of low-energy pions in the Dubna phasotron. In these experiments, the Coulomb shift in the spectra of charged pions was discovered for the first time. The study of the physics of the interaction of pions and kaons was continued in experiments that used a propane bubble chamber in a pulsed magnetic field. Barkov's remarkable ability to find simple and ingenious solutions to complex problems, characteristic of all his subsequent work, considerably contributed to the success of the whole work. The year 1967 began a new period in the scientific career of L M Barkov: Gersh Itskovich Budker invited him to work in Novosibirsk at the rather recently organized Institute of Nuclear Physics (INP) of the Siberian Branch of the USSR Academy of Sciences. Here he established a laboratory whose first goal was to continue research on the structure of hyperons. The experiment proposed by him to measure the magnetic moment of the Sÿ-hyperon, which utilized an electron beam extracted from a storage ring in the accelerator with colliding electron ± positron beams (VEPP-3), was based on using ultimately attainable magnetic fields of about one megagauss. To reach such fields, the newest ideas about magnetic explosion generators were utilized. Solid hydrogen was taken for the target, and the hyperon decay products were registered by nuclear photographic emulsion. Later on, the same method was employed in measurements of the magnetic moment of the L-hyperon at the Serpukhov U-70 proton accelerator. What was also measured was the antiproton production cross section for the interaction of high-energy protons with various nuclei. This was very important in view of the construction of the proton ± antiproton collider at CERN. In the mid-seventies, L M Barkov was eager to apply X-ray fluorescence elemental analysis via synchrotron radiation to find the island of stability for superheavy elements. He helped to design and build the world's first twenty-pole superconducting wiggler which made it possible to produce a 1.2-kW beam of X-ray synchrotron radiation, i.e., the brightness of the source in the X-ray range was increased by a factor of 200! At the same time, when work on building a new source of radiation was in progress, unique experimental facility for X-ray fluorescence analysis was under construction. This facility increased the sensitivity of the method by an additional factor of 100. Despite the fact that no superheavy elements were discovered in the experiments, Barkov's work contributed significantly to the development of the technology of generating synchrotron radiation and its applications in this country. Uspekhi Fizicheskikh Nauk 178 (12) 1367 ± 1368 (2008) DOI: 10.3367/UFNr.0178.200812k.1367 Translated by E Yankovsky PERSONALIA PACS number: 01.60.+q

A source of positrons allowing 5 × 108 positrons accelerated to the energy of 70 MeV to be produced per pulse has been developed. The process of electron-positron pair production in an electromagnetic shower is used for production of positrons. The electromagnetic shower is generated in a tantalum target by a beam of 2 × 1010 electrons with energy 270 MeV. A high efficiency of positron collection (positron yield Y ≈ 0.1 GeV−1) is ensured by a unique design of the matching device.

Памяти Бориса Валериановича Чирикова, Барков Л.М., Бондарь А.Е., Диканский Н.С., Димов Г.И., Кругляков Э.П., Кулипанов Г.Н., Мешков И.Н., Пархомчук В.В., Скринский А.Н., Соколов В.В., Фадин В.С., Хриплович И.Б.

Иосиф Бенционович Хриплович (к 70-летию со дня рождения), Байер В.Н., Барков Л.М., Бондарь А.Е., Диканский Н.С., Дмитриев В.Ф., Золоторев М.С., Кругляков Э.П., Кулипанов Г.Н., Скринский А.Н., Соколов В.В., Фадин В.С., Чириков Б.В.

Василий Васильевич Пархомчук (к шестидесятилетию со дня рождения), Барков Л.М., Димов Г.И., Диканский Н.С., Кругляков Э.П., Кулипанов Г.Н., Логачев П.В., Мешков И.Н., Пестриков Д.В., Салимов Р.А., Сидоров В.А., Скринский А.Н., Сухина Б.Н.

Александр Николаевич Скринский (к семидесятилетию со дня рождения), Барков Л.М., Беляев С.Т., Бондарь А.Е., Данилов М.В., Диканский Н.С., Кругляков Э.П., Кулипанов Г.Н., Мешков И.Н., Окунь Л.Б., Пархомчук В.В., Сидоров В.А., Шатунов Ю.М.

Эдуард Павлович Кругляков (к семидесятилетию со дня рождения), Барков Л.М., Вячеславов Л.Н., Диканский Н.С., Димов Г.И., Иванов А.А., Койдан В.С., Кудрявцев А.М., Кулипанов Г.Н., Сидоров В.А., Скринский А.Н., Тихонов Ю.А., Чириков Б.В.

The VÉPP-5 injection complex under construction at the Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences is a powerful source of intense electron and positron bunches at 510 MeV, which covers all needs of the electron–positron colliding beam setups currently operating and under construction at the Institute of Nuclear Physics. The complex includes a 285 MeV linear electron accelerator, a 510 MeV linear positron accelerator, and an accumulator–cooler with beam injection and ejection channels. Intense work on the design, assembly, and tuning of the linear electron accelerator has been conducted in the last 2 yr. As a result, by August 2002 the linear electron accelerator was put into operation with all standard subsystems. By this time, the isochronous achromatic turning of the electron beam, a system for converting electrons into positrons, and the first accelerating structure of the linear positron accelerator were assembled and put into operation. All this made it possible to accelerate the positron beam up to 75 MeV. Preliminary results of tests of the linear accelerators are presented.

Геннадий Николаевич Кулипанов (к шестидесятилетию со дня рождения), Барков Л.М., Винокуров Н.А., Диканский Н.С., Кругляков Э.П., Мезенцев Н.А., Пархомчук В.В., Сидоров В.А., Скринский А.Н., Тихонов Ю.А., Тумайкин Г.М., Чириков Б.В., Шатунов Ю.М.