Meshkov, I. N.

Paper	Title	Page
MOIO02	NICA Project at JINR	6
	I. N. Meshkov JINR, Dubna, Moscow Region
	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 = 1·1027 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 L = 1·1030 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.
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MOIO06	Recent Status of Beam Cooling at S-LSR	19
	A. Noda, M. Nakao, H. Souda, H. Tongu Kyoto ICR, Uji, Kyoto T. Fujimoto, S. I. Iwata, S. Shibuya AEC, Chiba M. Grieser MPI-K, Heidelberg I. N. Meshkov, A. V. Smirnov, E. Syresin JINR, Dubna, Moscow Region K. Noda, T. Shirai NIRS, Chiba-shi H. Okamoto HU/AdSM, Higashi-Hiroshima
	At S-LSR in ICR, Kyoto University, approaches to multi-dimensional laser cooling of Mg ions with the use of synchro-betatron coupling has been applied in addition to the realization of one dimensional ordering of 7 MeV proton beam with application of an electron beam cooling. In the present paper, recent results of transverse cooling of bunched beam will be presented together with an aproach to provide a short bunch 7 MeV proton beam with a high peak current to make bio-medical irradiation of biological cells.
	Slides
TUIOB01	Numerical Investigation of Stochastic Cooling at NICA Collider	52
	T. Katayama GSI, Darmstadt I. N. Meshkov, G. V. Trubnikov JINR, Dubna, Moscow Region
	At the heavy ion collider NICA promoted at the Dubna, JINR, the stochastic cooling will play the crucial roles to manipulate the beam. The primary goal is to prevent the IBS diffusion effects to keep the high luminosity during the experimental cycle. The other main purpose is to accumulate the beam intensity up to several times 1·1010 from the injector NUCLOTRON with use of barrier bucket method. With this method, the short bunch formation is not necessary in the injector NUCLOTRON, and is transferred to the collider as a long bunch condition. After the BB accumulation the coasting beam is adiabatically bunched with the help of RF field and the stochastic cooling. In the present paper the detailed simulation results are presented for the above three process (mainly longitudinal freedom) .
	Slides
WECOB01	Methods for Optimization of the Dynamics of the Storage of Positrons in the Surko Trap	81
	M. K. Eseev, A. G. Kobets, I. N. Meshkov, A. Yu. Rudakov, S. Yakovenko JINR, Dubna, Moscow Region
	Surko traps are used successfully, example, for the accumulation of positrons and antiprotons in the experiments on the generation of antihydrogen atoms the ALPHA/CERN. The report presents methods for optimizing the dynamics of the storage of positrons in the Surko trap based on experimental studies on the trap the facility LEPTA/JINR and theoretical estimates of the accumulation and dynamics of particles with technique "Rotating Wall".
	Slides
TUPS02	Booster Electron Cooling System of NICA Project
	A. Yu. Rudakov, E. V. Ahmanova, I. N. Meshkov, R. Pivin, V. I. Shokin, A. O. Sidorin, A. V. Smirnov, N. D. Topilin, Yu. A. Tumanova, S. Yakovenko JINR, Dubna, Moscow Region A. V. Ivanov BINP SB RAS, Novosibirsk A. V. Shabunov JINR/VBLHEP, Moscow
	Nuclotron-based Ion Collider fAcility (NICA) is the new accelerator complex being constructed at the JINR. It includes the injection complex, existing superconducting proton synchrotron "Nuclotron", and the new superconducting proton synchrotrons – the Booster and the Collider. We plan to use in the NICA several cooling systems: electron cooling for the Booster and for the Collider, and stochastic cooling for the Collider. The Booster electron cooling system is designed for the electron energy range of 1.5 – 60 keV and maximum current of 1.0 A. The elements of electron cooling system (electron gun, collector, power supply system) will be tested at the test-bench "Recuperator" at the JINR. In the report the design and the basic parameters of the Booster electron cooling system are presented.
TUPS13	Electron Cooler for NICA Collider	125
	S. Yakovenko, E. V. Ahmanova, A. G. Kobets, I. N. Meshkov, R. Pivin, A. Yu. Rudakov, A. V. Smirnov, N. D. Topilin, Yu. A. Tumanova JINR, Dubna, Moscow Region A. A. Filippov Allrussian Electrotechnical Institute, Moskow A. V. Shabunov JINR/VBLHEP, Moscow
	The electron cooling system at electron energy up to 2.5 MeV for the NICA collider is under design at JINR. The electron cooler is developed according to the available world practice of similar systems manufacturing. The main peculiarity of the electron cooler for the NICA collider is using of two cooling electron beams (one electron beam per each ring of the collider) that never has been done before. The acceleration and deceleration of the electron beams is produced by common high-voltage generator. The conceptual design of the electron cooling system has been developed. The cooler consist of three tanks. Two of them contain acceleration/deceleration tubes and are immersed in superconducting solenoids. The third one contains HV generator, which design is based on voltage multiplying scheme
TUPS20	Demonstration of Longitudinal Stacking in the ESR with Barrier Buckets and Stochastic Cooling	140
	M. Steck, C. Dimopoulou, B. Franzke, O. E. Gorda, T. Katayama, F. Nolden, G. Schreiber GSI, Darmstadt I. N. Meshkov, A. O. Sidorin, G. V. Trubnikov JINR, Dubna, Moscow Region D. Möhl CERN, Geneva R. Stassen, H. Stockhorst FZJ, Jülich
	Fast longitudinal beam accumulation has been demonstrated in the ESR at GSI with an Ar18+ beam coming from the synchrotron SIS18 at 400 MeV/u. Continuous application of stochastic cooling in all three phase space directions, merges the stack with the new injected bunch. Longitudinal beam compression was achieved by using either short barrier bucket rf pulses or by successive injections onto the unstable fixed point of the rf bucket at h=1. This recent experiment in the ESR provides the proof of principle for the planned longitudinal stacking of pre-cooled antiprotons in the HESR, injected from the CR.
THCOB01	Radiactive Recombination of Heavy Bare Nuclei and Ions in Electron Cooling System	48
	A. V. Philippov, A. B. Kuznetsov JINR/VBLHEP, Dubna, Moscow region I. N. Meshkov JINR/DLNP, Dubna, Moscow region
	An attempt to present a comprehensive overview of experimental data of radiative recombination (RR) rate of nuclei (from protons to uranium) and various intermediate charge states of ions in electron coolers is presented at the report. A comparison of the experimental data for bare nuclei with theoretical models of H. Kramers, M. Bell and J. S. Bell, R. Schuch has been performed. It is shown that the RR rate of bare nucleus depends on the electron energy shift relatively (in the center of mass system) to optimal electron energy as dE−3/8 (in energy range dE > 1 meV) that is significantly different from the theoretical approaches, including averaging over the transverse electron temperature. Also it is shown that the RR rate of bare nucleus depends on transverse temperature as Ttr. Analysis of the experimental data for cooled heavy ions shows that the rates of the process critically depends on their charge state (electron configuration of ion shells) and for some charge states essentially increases having a resonant character. The estimations of RR rate losses of the Au32+, Au33+, Au43+, Au51+, Au61+, Au68+ and Au69+ ions beam due to RR process in the electron cooler of the Booster is presented. The bare nuclei Au79+ lifetime limitation due to RR process in the electron cooler of the Collider NICA is analyzed and measures of its increasing are considered.
	Slides