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55 MeV RACE-TRACK MICROTRON OF THE LEBEDEV INSTITUTE |
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A.I. Karev¹, A.N. Lebedev¹, V.G. Raevskyª¹, A.N. Kamanin², N.I. Pahomov², V.I. Shvedunov² ¹Lebedev Physical Institute of Russian Academy of Sciences, Moscow, Russia ²Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia Abstract The design of 55 MeV Race-Track Microtron (RTM) with pulse current up to 50 mA has been completed and now accelerator is under construction. We present the general scheme of this microtron, the basic results of computer simulation, the parameters of the RTM components and describe engineering design and status of the machine. ª – corresponding author |
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COMPENSATION OF THE BEAM VERTICAL DEFOCUSING AT THE EXIT OF U400 CYCLOTRON SPIRAL INFLECTOR |
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B.N. Gikalª, G.G. Gulbekyan, I.A. Ivanenko Joint Institute for Nuclear Research, Dubna, Russia Abstract The calculations and experiments on the beam dynamic at U400 cyclotron spiral inflector shows the presents of the vertical defocusing of the beam at the inflector exit. This leads to aperture losses of the beam at the cyclotron centre. In this present work the method of decreasing of the vertical defocusing effect of U400 cyclotron spiral inflector is presented. The decreasing of the vertical defocusing is achieved by means of special form of the inflector electric field. The calculations have shown the beam vertical envelope at the inflector exit has an appreciably smallest dimension and slope. ª – corresponding author |
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DEUTERON BEAM ACCELERATION AT LINAC I-100 AND IHEP BOOSTER |
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Yu. Antipov, N. Anferov, G. Antonichev, V. Baranov, V. Batarin, V. Bezkrovney, A. Gurevichª, V. Davydov, N. Ignashin, L. Kim, V. Kokovin, V. Komarov, O. Kurnaev, V. Lapygin, Yu. Milichenko, A. Markin, E. Nelipovich, S. Pilipenko, V. Rudko, D. Savin, T. Sinkina, V. Stolpovsky, I. Sulygin, A. Surensky, S. Sytov, V. Terekhov, V. Uglekov, V. Voevodin Institute of High Energy Physics, Protvino, Russia Abstract Light ion acceleration program is being pursued in IHEP, Protvino. Light ion beams are planned to be used both for fundamental and applied research. Currently, the scope of activity extends over an ion source, the 100 MeV Alvarez linac I100, new beam transfer line from I100 to the 1.3 GeV rapid-cycled Booster proton synchrotron U1.5, beam injection system, and the U1.5 machine itself. In the first run of 2008, 3∙1010 deuterons were successfully accelerated up to 450 MeV/u and extracted to an external beam absorber. The report outlines technical milestone passed, up-to-date status of these works and experimental results achieved. ª – corresponding author |
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HEAVY ION INJECTOR FOR NICA/MPD PROJECT |
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V.V. Kobets¹, A.I. Govorov¹, G.V. Trubnikov¹, E.E. Donets¹, E.D. Donets¹, A.O. Sidorinª¹, V.A. Monchinsky¹, I.N. Meshkov¹, O.K. Belyaev², A.P. Maltsev², Yu.A. Budanov², I.A. Zvonarev² ¹Joint Institute for Nuclear Research, Dubna, Russia ²Institute of High Energy Physics, Protvino, Russia Abstract General goal of the NICA/MPD project under realization at JINR is to start in the coming 5÷7 years an experimental study of hot and dense strongly interacting QCD matter and search for possible manifestation of signs of the mixed phase and critical endpoint in heavy ion collisions. The Nuclotron-based Ion Collider fAcility (NICA) and the Multi Purpose Detector (MPD) are proposed for these purposes. The NICA collider is aimed to provide experiment with heavy ions like Au, Pb or U at energy up to 3.5×3.5 GeV/u with average luminosity of 1027 cm-2∙s-1 and to provide collisions of light ions in the total energy range available with the Nuclotron. New injector designed for efficient operation of the NICA facility is based on Electron String Ion Source providing short (< 10 μs) and intensive pulses of U32+ ions, one section of RFQ and four sections of RFQ Drift Tube Linac accelerating the ions at Z/A 0.12 up to 6.2 MeV/u of the kinetic energy. General parameters of the injector are discussed. ª – corresponding author |
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ITERATIVE METHOD FOR MODELING OF STEADY OPERATION MODES OF MULTIPURPOSE ISOCHRONOUS CYCLOTRONS |
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I.V. Amirhanov¹, G.A. Karamysheva¹, I.N. Kiyanª¹, J. Sulikowski², R. Taraszkiewicz² ¹Joint Institute for Nuclear Research, Dubna, Russia ²Instytut Fizyki Jądrowej Polskiej Akademii Nauk, Kraków, Polska Abstract The mathematical and computer modeling of operation modes of multipurpose isochronous cyclotrons is based on calculation of currents in trim coils of correction of the basic magnetic field at a certain level of current in the main coil. The calculation is made for a given extraction energy or rotation frequency of particles. The results of the calculation allow a required magnetic field to be formed with a certain accuracy in the range from the ion source to the extraction radius of particles. The method derives its name from iterative calculation of extraction energy, current in the main coil, and isochronous magnetic field with allowance for influence of the trim coil contributions on the flutter of the basic magnetic field. The essentially new algorithm of excluding some of the involved trim coils from the calculation is based on consecutive selection them. The input of solution in frameworks of the given boundary conditions are carried out step by step. The use of interpolation both inside and between the measured maps of magnetic fields allows interpolating the resulting maps of magnetic fields instead of measuring them. In turn, it allows to replace calculating-experimental iterations for formation of the required magnetic field only calculating. A series of physical experiments carried out in 2007 at the multipurpose isochronous cyclotron AIC144 (INP PAS, Krakow) confirmed legitimacy of this replacement. The essentially new algorithm of excluding some of the involved trim coils from the calculation has allowed stability of the resulting magnetic field to be improved; That is, the influence on the quality of the calculated operation modes of a lot of the factors (the accuracy of the measurement of the source magnetic field maps, the features of the start-up algorithm of the cyclotron at a certain operation mode, the stability of the used power supplies, etc.) became less significant. A series of numerical experiments on calculation of the basic operation mode of AIC (p, 60 MeV / 26.25 MHz) confirmed the necessity of including the evaluation of the solution stability into the calculation. ª – corresponding author |
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RELUS-5 ELECTRON LINAC START-UP |
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D. Churanov¹, F. Fadin¹, A. Krasnov¹, M. Urbant¹, A. Zavadtsevª¹, D. Zavadtsev¹, N. Sobenin² ¹Nano Invest, Moscow, Russia ²Moscow Engineering Physics Institute (State University), Moscow, Russia Abstract The compact electron linac RELUS-5 was developed for radiation investigation of material modification. The experience of the standing wave electron accelerator building starting since first in the USSR standing wave electron linac RELUS-1 in 1978 [1] were used. Electron energy range is from 3 to 5 MeV. Pulse length is from 3 to 6 μsec. Average power of accelerated beam is up to 1 kW. The main task of submitted work is to build simple and cheap applied electron linac and to show how to do it. ª – corresponding author |
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SUPERCONDUCTING RF ELECTRON RECIRCULATOR FOR NUCLEAR PHYSICS RESEARCH AT LEBEDEV PHYSICAL INSTITUTE |
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V.G. Kurakinª¹, G.A. Sokol¹, V.G. Nedoresov², B.S. Ishkhanov³, V.I. Shvedunov³ ¹Lebedev Physical Institute of Russian Academy of Sciences, Moscow, Russia ²Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia ³Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia Abstract Conceptual design of the superconducting rf accelerator is discussed. This machine is supposed to be used in the field of low and intermediate energy nuclear physics. Four pairs of dipole magnets at the vertexes of square and four superconducting rf linacs between them form a configuration that allows multiple electron beam acceleration from the injection to the final energy, synchronism being provided by proper orbit lengthening in bending magnets after each turn. Additional superconducting rf linac is used for injection into the main accelerator. Special design of dipole magnet makes it possible to stop recirculation in order to guide beam to experimental area. Thin target is used for experiments in order to recover beam energy. This allows to save rf energy and to provide safe radiation conditions of the accelerator as well. Synchronism conditions as well as dipole magnet design dictate the energy gain per turn in the accelerator. For field strength about 14 kGs in dipoles the energy gain per turn is 600 MeV for TESLA type superconducting cavity (f=1.3 GHz), and the maximum electron energy 2 GeV might be realized with 3 turns. Taking into account the working accelerator gradient 25 MeV/m of TESLA type cavity the accelerator might be placed in existing accelerator hole of the high energy physics department in Troitsk where electron synchrotron to the energy 1.3 GeV is under operation now. The main arguments in favor of accelerator schema suggested are given in the paper. Beam optics as well as recovery problems are discussed followed the appropriate beam envelope calculations. ª – corresponding author |
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THE NEW OPERATION MODE OF SYNCHROTRON "PAKHRA" |
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G.G. Subbotinª Lebedev Physical Institute of Russian Academy of Sciences, Moscow, Russia Abstract It was examined the change of the magnet power supply of synchrotron "Pakhra". To solve the new physical task it is advisable to reconstruct the working regime of alternating current component. It is allowed to accelerate the particles up to 650 MeV for 5 msec and to hold them further with the help of constant energy more than 1 second. In this case synchrotron "Pakhra" can by effectively used as a synchrotron radiation source. ª – corresponding author |
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TRANSPORTATION OF THE PROTON BEAM AT THE EXPERIMENTAL COMPLEX OF LINEAR ACCELERATION INR OF THE RAS |
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M.I. Grachev¹, L.V. Kravchuk¹, E.V. Ponomarevaª¹, V.K. Gorbunov¹, V.C. Seleznev² ¹Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia ²Institute of High Energy Physics, Protvino, Russia Abstract Experimental Complex of Linear Accelerator INR of the RAS, work of channels, the equipment, parameters of the proton beams and facilities. ª – corresponding author |
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