Author: Meshkov, I.N.
Paper Title Page
MOXCH03 NICA Project at JINR 5
 
  • I.N. Meshkov
    JINR, Dubna, Moscow Region, Russia
  
  Status of the project of Nuclotron-based Ion Collider fAcility NICA/MPD (MultiPurpose Detector) under development at JINR (Dubna) is presented. The general goals of the project are providing of colliding beams for experimental studies of both hot and dense strongly interacting baryonic matter and search for the mixed phase and critical endpoint. Spin physics experimental studies in collisions of polarized protons (deuterons) are planned as the second stage of the project. The first program requires providing of heavy ion collisions in the energy range of squrt(s) = 4-11 GeV at average luminosity of L = 1027 cm-2 s−1 for Au79+. The polarized beams mode is proposed to be used in energy range of squart(s) = 12-27 GeV (protons) at luminosity of 1030 cm-2 s−1. The key issue of the project is application of both stochastic and electron cooling methods at the NICA collider. The latter will be used in the NICA Booster for preliminary formation of the ion beam. The report contains description of the facility scheme and characteristics in heavy ion operation mode, the discussion of luminosity life time limitations, status and plans of the project development.  
slides icon Slides MOXCH03 [4.875 MB]  
 
TUXCH03 Approach to the Low Temperature State Oriented for Crystalline Beam 48
 
  • A. Noda, M. Nakao, H. Souda, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • M. Grieser
    MPI-K, Heidelberg, Germany
  • Z.Q. He
    TUB, Beijing, People's Republic of China
  • K. Jimbo
    Kyoto University, Institute for Advanced Energy, Kyoto, Japan
  • I.N. Meshkov, A.V. Smirnov
    JINR, Dubna, Moscow Region, Russia
  • K. Noda, T. Shirai
    NIRS, Chiba-shi, Japan
  • H. Okamoto, K. Osaki
    HU/AdSM, Higashi-Hiroshima, Japan
  • Y. Yuri
    JAEA/TARRI, Gunma-ken, Japan
  
  Funding: Work supported by Advanced Compact Accelerator Development of MEXT. It is also supported by GCOE project at Kyoto University, "The next generation of Physics-Spun from Universality and Emergence".
With the use of S-LSR, an ion storage and cooler ring at ICR, Kyoto University, approach to attain the low temperature beam has been continued in these several years. Based on the realization of one dimensional ordered state of 7 MeV proton beam by an electron cooling*, effort to reach lower temperature by laser cooling with much stronger cooling force, has been continued for 40 keV Mg ion beam. With the use of synchro-betatron resonance coupling(SBRC), longitudinal cooling effect can be well expected to be transferred to the transverse directions** and we have experimentally demonstrated of such effect***. The transverse cooling efficiency is, however, not so good deteriorated by intra-beam scattering (IBS) effect for the beam intensities higher than 107. Although the reduction of the beam intensity keeping enough S/N ratio for observation of the beam, is not so easy, we are now challenging "controlled scraping", which controls the horizontal scraper position according to the extent of the indirect horizontal laser cooling by SBRC. In the present paper, our research stream from electron cooling to multi-dimensional laser cooling is surveyed at first and then challenge toward the crystalline beam is to be presented.
*: T. Shirai et al., Phys. Rev. Lett., Vol.98 (2007)204801.
**:H. Okamoto, A.M. Sessler and D. Möhl, Phys. Rev. Lett. Vol.72 (1994) 3977.
***: M. Nakao et al., to be submitted to Phys. Rev. ST-AB. 		 
slides icon Slides TUXCH03 [8.557 MB]  
 
TUYCH01
 Application of the Beam Cooling Methods at the NICA Project  
 
  • G.V. Trubnikov, I.N. Meshkov, A.O. Sidorin, A.V. Smirnov, S. Yakovenko
    JINR, Dubna, Moscow Region, Russia
  • T. Katayama
    GSI, Darmstadt, Germany
  
  The Nuclotron-based Ion Collider fAcility (NICA) is a new accelerator complex being constructed at JINR aimed to provide experiments with colliding heavy ions up to Au for experimental study of hot and dense strongly interacting baryonic matter and search for possible signs of the mixed phase and critical endpoint in the centre-of-mass energy range sq.root(SNN) = 4-11 GeV. This facility includes new 3 MeV/u linac, 600 MeV/u booster synchrotron (Booster), upgraded superconducting (SC) synchrotron Nuclotron (4,5 GeV/u maximal kinetic energy for ions with Z/A = 1/3) and collider consisting of two vertically separated SC rings, which provide average luminosity of the order of 10e27cm2s1 at high energies. Beam cooling systems are proposed for elements of the NICA project. The Booster synchrotron will be equipped with an electron cooling system. Two beam cooling systems – stochastic and electron will be used in the collider rings. Parameters of the cooling systems, proposed scenario of operation and peculiarities of their design intended to achieve required beam parameters are presented in this report.  
slides icon Slides TUYCH01 [3.574 MB]  
 
TUYCH02 Beam Cooling at NICA Collider 53
 
  • T. Katayama
    GSI, Darmstadt, Germany
  • I.N. Meshkov, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  
  At the NICA collider project it is planned to make collision of 24 short bunches, each containing around 109 197Au79+ ions, at the two colliding points in the ring. The operation energy is envisaged from 1 GeV/u to 4.5 GeV/u. To prepare such beam conditions, the beam cooling technique, stochastic and electron beam, is employed at the beam accumulation from the injector Nuclotron and the following short bunch formation stage. Rather long pulse beam could be injected and accumulated in the collider with use of barrier voltage and beam cooling. After the enough beam accumulation, typically 2.4·1010, the high voltage RF with harmonic number 24 is applied to the accumulated coasting beam as well as the beam cooling which allow us to make the required short bunch of around 1nsec rms bunch length. The equilibrium condition is attained after 100~200 sec cooling, with the balance of RF force, cooling effects, IBS diffusion and the space charge repulsion force. In the present paper, detailed simulation results of beam accumulation and short bunch formation with stochastic cooling and electron cooling are presented including the space charge effects.  
slides icon Slides TUYCH02 [6.065 MB]  
 
TUACH01 Status of the High Voltage Electron Cooler Project for NICA Collider 58
 
  • S. Yakovenko, E.V. Ahmanova, A. Ivanov, A.G. Kobets, I.N. Meshkov, A.Yu. Rudakov, A.V. Smirnov, N.D. Topilin
    JINR, Dubna, Moscow Region, Russia
  • A.V. Shabunov
    JINR/VBLHEP, Moscow, Russia
  
  The electron cooling system at electron energy up to 2.5 MeV for the NICA collider is under design at JINR. The magnetic system and system of transfer of capacity on high potential is developed. The high voltage generator prototype on 250 kV was tested. The technical design of the electron cooling system was started.  
slides icon Slides TUACH01 [1.035 MB]  
 
THAOR03 Status of the Design and Test of Superconducting Magnets for the NICA Project 149
 
  • H.G. Khodzhibagiyan, P.G. Akishin, A.V. Bychkov, A. Donyagin, A.R. Galimov, O.S. Kozlov, G.L. Kuznetsov, I.N. Meshkov, V.A. Mikhaylov, E.V. Muravieva, P.I. Nikitaev, A.V. Shabunov, A.V. Smirnov, A.Y. Starikov, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  
  NICA is a new accelerator complex being under design and construction at Joint Institute for Nuclear Research in Dubna. The actual design and the main characteristics of superconducting magnets for the NICA booster and the NICA collider are given. The magnets are based on a cold window frame iron yoke and a single-layered superconducting winding made from a hollow NbTi composite superconductor cable cooled with forced two-phase helium flow. The first results of cryogenic tests of the magnets for the NICA project are presented.  
slides icon Slides THAOR03 [0.884 MB]  
 
MOPPA011
 Physical Startup of the First Stage of the Electron Linear Acceleration LINAC-800  
 
  • V. Kobets, N. Balalykin, A.G. Kobets, I.N. Meshkov, V. Minashkin, M.A. Nozdrin, G. Shirkov, A.P. Sumbaev
    JINR, Dubna, Moscow Region, Russia
  • V. Shabratov
    JINR/VBLHEP, Moscow, Russia
  
  It is reported on startup of the first stage of the Electron Linear Acceleration LINAC-800 at the Veksler and Baldin Laboratory of High Energy Physics of the Joint Institute for Nuclear Research. As a result of commissioning is designed and manufactured control unit PFN-modules, carried out to the launch of the first accelerating station modulator electron linear accelerator LINAC-800. Launched and debugged high-frequency master RF-system of linear electron accelerator, conducted RF-training first accelerating section. Accelerated electron beam, are its characteristics.  
 
WEZCH03 Status of the Nuclotron 117
 
  • A.O. Sidorin, N.N. Agapov, A.V. Alfeev, V. Andreev, V. Batin, A.V. Butenko, D.E. Donets, E.D. Donets, A.V. Eliseev, V.V. Fimushkin, A.R. Galimov, E.V. Gorbachev, A. Govorov, E.V. Ivanov, V. Karpinsky, V.D. Kekelidze, H.G. Khodzhibagiyan, A. Kirichenko, A.G. Kobets, A.D. Kovalenko, O.S. Kozlov, N.I. Lebedev, I.N. Meshkov, V.A. Mikhailov, V. Monchinsky, S. Romanov, T.V. Rukoyatkina, N. Shurkhno, I. Slepnev, V. Slepnev, A.V. Smirnov, A. Sorin, G.V. Trubnikov, A. Tuzikov, B. Vasilishin, V. Volkov
    JINR, Dubna, Moscow Region, Russia
  • O.I. Brovko, D.E. Donets, A.V. Philippov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  
  One of the goals of present Nuclotron development is to test operational modes, diagnostic and beam control equipment required for R&D of the NICA collider elements. Main achievement in this direction are descussed. Results of the last runs of the Nuclotron operation are presented.  
slides icon Slides WEZCH03 [3.582 MB]  
 
MOPPA017 Collider of the NICA Accelerator Complex: Optical Structure and Beam Dynamics 278
 
  • O.S. Kozlov, A.V. Eliseev, H.G. Khodzhibagiyan, S.A. Kostromin, I.N. Meshkov, A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  
  Accelerator complex NICA, developed in VBLHEP JINR, must provide an ion-ion (Au79 +) and ion-proton collisions at energies of 1-4.5 GeV/u, as well as experiments on collisions of polarized proton-proton and deuteron-deuteron beams. The calculations of the optical properties of superconducting collider rings have been aimed to create appropriate conditions for the collisions of beams and obtaining the required luminosity parameters in the working range of energies. The collider characteristics and the beam dynamics have been worked out in most for ion-ion mode of the complex.  
 
TUPPB003 Progress in NICA Booster Design 310
 
  • A.S. Valkovich, O.S. Kozlov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  
  New collider facility NICA * is envisioned to be built at The Joint Institute of Nuclear Research. The work presented explores issues of correction system of the Booster Synchrotron. The optimal arrangement of Beam Position Monitors and Orbit Correctors along the ring was investigated in order to achieve decent quality of the orbit correction. The SVD properties of the orbit correction system are presented. Optimal arrangement of the sextupole lenses for the correction of chromaticity of the ring was obtained. The reduction of the dynamical aperture due to the presence of the sextupole lenses was minimized by means of proper choice of betatron phase advances between the lenses.
* Design and construction of Nuclotron-based Ion Collider fAcility (NICA), Conceptual design report, Editors I.Meshkov, A.Sidorin, JINR, Dubna, 2008 		 
 
TUPPB004 Development of Stochastic Cooling Technique for NICA Project 313
 
  • N. Shurkhno
    MSU, Moscow, Russia
  • A.G. Kobets, I.N. Meshkov, V.V. Seleznev, A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  • R. Stassen
    FZJ, Jülich, Germany
  
  The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing. Stochastic cooling system was constructed in 2011. Important results of runs performed at Nuclotron (December 2011 and March 2012) are the following: beam Shottky-noise in the energy range 0.5-4 GeV/u has been measured for deutron and carbon beams with new pick-up structure and methodology for notch-filter and system delay adjustments (open-loop measurements) have been tested. Afterwards the initial scheme was revised and significantly improved and now is being prepared for the experiment. This report presents the results of first stochastic cooling tests at Nuclotron, and further development of stochastic cooling system.  
 
TUPPB005 LEPTA Project: Towards Positronium 316
 
  • A.G. Kobets, E.V. Ahmanova, V.I. Lokhmatov, I.N. Meshkov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko
    JINR, Dubna, Moscow Region, Russia
  • M.K. Eseev
    NAFU, Arkhangelsk, Russia
  
  The project of the Low Energy Positron Toroidal Accumulator (LEPTA) is under development at JINR. The LEPTA facility is a small positron storage ring equipped with the electron coolin system. The project positron energy is of 2 – 10 keV. The main goal of the facility is to generate an intense flux of positronium atoms – the bound state of electron and positron. Storage ring of LEPTA facility was commissioned in September 2004 and was under development up to now. The positron injector has been constructed in 2005 - 2010, and beam transfer channel – in 2011. By the end of August 2011 experiments on electron and positron injection into the ring have been started. The recent results are presented here.  
 
TUPPB006 Compression and Confinement of Positron Clouds in the Surko Trap of LEPTA Facility 319
 
  • M.K. Eseev, A.N. Vititnev
    NAFU, Arkhangelsk, Russia
  • E.V. Ahmanova, A.G. Kobets, I.N. Meshkov, A.Yu. Rudakov, S. Yakovenko
    JINR, Dubna, Moscow Region, Russia
  
  A bunch of positrons confined in a cylindrical Penning-Malmberg trap can be compressed radially by applying a rotating asymmetric dipolar electric field. An explanation of this effect presented in the report is based on the solutions of particle 3D dynamics equations in the fields of the trap taking into account the positron collisions with a neutral buffer gas. The result agrees well with experimental data obtained at the positron injector of LEPTA facility at JINR. Essential feature of the compression process is resonant character of applied rotating field and coincidence its frequency with the frequency of longitudinal positron bouncing in the trap.  
 
TUPPB007 Transfer Channel from Booster to Nuclotron at the NICA Facility 322
 
  • G.A. Filatov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, N.D. Topilin, G.V. Trubnikov, A. Tuzikov
    JINR, Dubna, Moscow Region, Russia
  
  In the last years the Nuclotron-based Ion Collider fAcility (NICA) project is developed at Joint Institute for Nuclear Research (JINR), Dubna, Russia. Important elements of the NICA are two synchrotrons: Booster and Nuclotron. Connection between these synchrotrons is provided with the transfer channel for heavy ions at energy of 600 MeV/u. The transfer channel includes a stripping station and charge separation system. General goal of the optic design is to minimize emittance at the exit of the channel. Magnetic system of the channel will be constructed using magnets of the Nuclotron type.  
 
WEPPC012
 Progress in Booster Design in the NICA Project  
 
  • A.V. Butenko, A. Tuzikov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • H.G. Khodzhibagiyan, I.N. Meshkov, V.A. Mikhailov, G.V. Trubnikov, A.S. Valkovich
    JINR, Dubna, Moscow Region, Russia
  
  In the framework of the NICA project the new Booster lattice is designing. The NICA layout includes Electron String Ion Source, 3 Mev/u linac, 600 MeV/u booster synchrotron, upgraded Nuclotron and ion collider. The main goals of the Booster are the following: accumulation of 2*E9 Au32+ ions; acceleration of the heavy ions up to energy required for effective stripping; forming of the required beam emittance with electron cooling system. The present layout makes it possible to place the Booster having 211 m circumference and four fold symmetry lattice inside the yoke of the Synchrophasotron. The features of this booster, the requirement to the main synchrotron systems and their parameters are presented in this paper.  
 
MOBCH01 Storage, Acceleration and Short Bunched Beam Formation of 197Au+79 Ions in the NICA Collider 30
 
  • A.V. Eliseev, A.V. Smirnov
    JINR, Dubna, Moscow Region, Russia
  • T. Katayama
    GSI, Darmstadt, Germany
  • E. Kenzhbulatov, G.Y. Kurkin, V.M. Petrov, V. Volkov
    BINP SB RAS, Novosibirsk, Russia
  • O.S. Kozlov, A.O. Sidorin, G.V. Trubnikov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  
  The regimes of high intensity beam of 197Au79+ ions in NICA Collider is considered. The first stage – ion storage is proposed to be performed with Barrier Bucket technique at ion energy of 1–3 GeV/u. Experiments in collider mode in this energy range can be performed at injection energy. For experiments at higher, up to 4.5 GeV/u, energy ions are accelerated with the same BB method. Formation of bunched beam is fulfilled in two steps – first, at 24th harmonics and then, final formation, at 72th harmonics of RF system. The possibility of achievement of designed bunch parameters is shown.  
slides icon Slides MOBCH01 [0.807 MB]  
 
MOPPA016 Dynamics of 197Au78+ Ions Generated in Recombination with Cooling Electrons in the NICA Collider 275
 
  • A.V. Eliseev
    JINR, Dubna, Moscow Region, Russia
  • O.S. Kozlov, A.B. Kuznetsov, A.V. Philippov, A.O. Sidorin, A. Tuzikov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  
  Ions 197Au78+ are generated in recombination of original bare nuclei 197Au79+ with cooling electrons in the electron cooler of the NICA Collider. The ions 197Au78+ dynamics is considered in the in energy range 1–4.5 GeV/u when ion beam is bunched with RF voltage (collision mode operation of the NICA Collider). It is shown that some part of 197Au78+ ions can be involved in synchrotron motion when other part suffers a chaotic motion regime. Most of these ions live in vacuum chamber until further recombination in to the state of 197Au77+ and leave the Collider acceptance very fast. The evolution in time of ion distribution over the Collider aperture is presented.  
 
TUPPB002 Effect of Gold Nuclei Recombination in Electron Cooling System on Beam Lifetime in the NICA Collider 307
 
  • A.V. Philippov, O.S. Kozlov, A.B. Kuznetsov, A. Tuzikov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  
  On the basis of experimental data the production of the ions Au78+ and Au77+ as a result of step-by-step radiative recombination of bare nuclei on free electrons in the NICA Collider electron cooling system is presented. The influence of Au78+ ions on the luminosity lifetime is discussed. The optimum working cycle of the NICA Collider is described.  
 
WEPPC036
 Experimental Studies of Secondary Electron-Electron Emission by Vacuum Chamber Surface  
 
  • A.Yu. Rudakov
    JINR, Dubna, Moscow Region, Russia
  • I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  • A.V. Philippov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  
  The experiment to measure secondary electron yield (SEY) of the samples coated with titanium nitride (TiN2) is in progress at the test-bench "Recuperator". This work is related to the problem of the electron clouds formation in vacuum chamber surface. This effect plays an important role in limiting the performance of the collider NICA. The results of the experiment to measure SEY will allow us to choose the most suitable coating material of vacuum chambers. In this experiment we compared samples of stainless steel coated with titanium nitride and uncoated ones.  
 
WEPPC044 Positron Annihilation Spectroscopy at LEPTA Facility 532
 
  • P. Horodek, I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  • A.G. Kobets, V.I. Lokhmatov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko
    JINR, Dubna, Moscow Region, Russia
  
  The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS). The positron injector of the LEPTA facility can generate continuous slow positron beam of the intensity up to 1*107 s−1 at the energy in the range of a few eV to 100 keV and width of the spectrum 1-2 eV. The injector is based on radioactive 22Na isotope. The solid neon is used as moderator to generate monochromatic positron beam. It is known that positrons implanted into the matter can localize the defects of structure as vacancies, clusters of vacancies and pores. Observation of gamma quanta (511 keV) from annihilation process allows to obtain the information about the presence, concentration and kind of defects. Nowadays, the experiments with the use of slow positrons beam instead of standard isotopic sources are more popular. The progress in the creation of Doppler broadening of annihilation gamma line spectrometer will be presented here. In the simplest version, it is a set composed of a HpGe detector, a preampliefier, an ampliefier, a MC analyzer and a PC computer. This combination makes possible the observation of changes in 511 keV gamma line, calculation characteristics for PAS parameters and in effect to deduce about defects concentration and their chemical surrounding.