Status Reports
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TUP05
 Towards Laser Cooling of Relativistic 16O5+ Ion Beams at the CSRe  
 
  • H.B. Wang, B. Hai, Z. Huang, J. Li, X.N. Li, X. Ma, L.J. Mao, R.S. Mao, W.Q. Wen, J.X. Wu, J.C. Yang, Y.J. Yuan, D. Zhang, D. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  • M.H. Bussmann
    HZDR, Dresden, Germany
  • D.F.A. Winters
    GSI, Darmstadt, Germany
  
  Laser cooling is one of the most promising techniques to achieve high phase-space densities or even crystalline beams for relativistic heavy ion beams at storage rings [*]. In addition, precision laser spectroscopy of relevant transitions in highly charged ions can also be performed simultaneously during the laser cooling experiments [**]. In the storage ring CSRe at IMP, a new laser cooling experiment for Li-like 16O5+ ion beams is currently being prepared and will be carried out at the end of the year 2017 under the Laser-cooling Collaboration. During the experiment, a CW laser with a wavelength of 220 nm will be used to cool the 16O5+ ion beams with an energy of 280 MeV/u. The 16O5+ ion beams will be the highest charge state and highest energy ions ever used for laser cooling at the storage rings. In the experiment, the longitudinally dynamics of ultra-cold ion beams will be investigate systematically towards the transition of the space charge dominated regime. Precision laser spectroscopy of 16O5+ ions for measuring the transition energy of 2s1/2'2p1/2 and 2s1/2'2p3/2 is foreseen.
[*] U. Schramm et al., Progress in Particle and Nuclear Physics, 53 (2004) 583-677.
[**] U. Schramm et al., Hyperfine Interactions 162(1) (2005), 181-188
 		 
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TUP19
 Status Report about the HV Power Supply and its Test-bench for the HESR Electron Cooler  
 
  • I. Alexander, W. Klag
    IKP, Mainz, Germany
  • K. Aulenbacher, J. Dietrich
    HIM, Mainz, Germany
  • M.I. Bryzgunov, V.V. Parkhomchuk, V.B. Reva
    BINP SB RAS, Novosibirsk, Russia
  
  For an effective cooling at HESR electron energies between 2 MeV and 8 MeV are needed and continuous magnetic beam guidance from the gun to the collector is indispensable. In order to provide the necessary power for the magnet coils, several gas turbines are placed at different electrical potentials. The turbines can deliver a power of 5 kW and are operated with N2. The HV potentials are created by stacking power supplies (PS) that can produce a voltage of 600 kV. The group around V. V. Parkhomchuk at BINP has developed a prototype of the PS. Tests and improvements are ongoing until end of this year. As soon as the PS arrives at the HIM in Mainz, it will be assembled in a pressure vessel to ensure full operation capability. Various future projects could be realized. First, an electron gun could be attached to the PS to characterize different properties by electron beam. Secondly, an additional PS could be installed to increase the electron energy to 1.2 MeV. Thirdly, a gun and a collector could be attached to the PS and a magnetic structure for the beam recirculation could be mounted to demonstrate the feasibility of an electron cooler with the developed equipment.  
poster icon Poster TUP19 [2.078 MB]  
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WEM22 Status of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL 77
 
  • I. Pinayev, Z. Altinbas, R. Anderson, S.A. Belomestnykh, K.A. Brown, J.C.B. Brutus, A.J. Curcio, A. Di Lieto, C. Folz, D.M. Gassner, T. Hayes, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, Y.C. Jing, D. Kayran, R. Kellermann, R.F. Lambiase, V. Litvinenko, G.J. Mahler, M. Mapes, A. Marusic, W. Meng, K. Mernick, R.J. Michnoff, K. Mihara, T.A. Miller, M.G. Minty, G. Narayan, P. Orfin, D. Phillips, T. Rao, D. Ravikumar, J. Reich, G. Robert-Demolaize, T. Roser, S.K. Seberg, F. Severino, B. Sheehy, K. Shih, J. Skaritka, L. Smart, K.S. Smith, L. Snydstrup, V. Soria, R. Than, C. Theisen, J.E. Tuozzolo, J. Walsh, E. Wang, G. Wang, D. Weiss, B. P. Xiao, T. Xin, W. Xu, A. Zaltsman, Z. Zhao
    BNL, Upton, Long Island, New York, USA
  • C.H. Boulware, T.L. Grimm
    Niowave, Inc., Lansing, Michigan, USA
  • J. Ma
    SBU, Stony Brook, New York, USA
  • I. Petrushina
    SUNY SB, Stony Brook, New York, USA
  
  Funding: Work supported by the US Department of Energy under contract No. DE-SC0012704
The coherent electron cooling proof-of-principle experiment is aimed to demonstrate new technique suitable for cooling of the high energy protons and is essential for a future electron-hadron collider. In this paper we present the current status of the equipment, achieved beam parameters, and progress of the experiment. Future plans are also discussed. 		 
slides icon Slides WEM22 [3.473 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-WEM22  
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THM13 Commissioning of the Low Energy Storage Ring Facility CRYRING@ESR 81
 
  • F. Herfurth, Z. Andelkovic, M. Bai, A. Bräuning-Demian, V. Chetvertkova, O. Geithner, W. Geithner, O.E. Gorda, M. Lestinsky, S.A. Litvinov, G. Vorobjev, U. Weinrich
    GSI, Darmstadt, Germany
  • A. Källberg
    Stockholm University, Stockholm, Sweden
  • T. Stöhlker
    HIJ, Jena, Germany
  
  CRYRING@ESR is the early installation of the low-energy storage ring LSR, a Swedish in kind contribution to FAIR, which was proposed as the central decelerator ring for antiprotons at the FLAIR facility. An early installation opens the opportunity to explore part of the low energy atomic physics with heavy, highly charged ions as proposed by the SPARC collaboration but also experiments of nuclear physics background much sooner than foreseen in the FAIR general schedule. Furthermore, the ring follows in large parts FAIR standards, and is used to test the FAIR control system. CRYRING@ESR has been installed behind the existing experimental storage ring ESR starting in 2013. It has a local injector that is used for commissioning. In November 2016 the commissioning of the storage ring started and a first turn was achieved. After a complete bake out cycle and substantial developments of control system, diagnosis and others, commissioning was continued in late summer 2017. Stored as well as accelerated beam has been achieved by now. The remaining step is to take the electron cooler into operation, which is planned for November this year.  
slides icon Slides THM13 [4.318 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-THM13  
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THM22
 Status of the FAIR Project  
 
  • J. Henschel
    GSI, Darmstadt, Germany
  
  The FAIR international particle accelerator is set to be one of the largest research facilities in the world. Based in the German city of Darmstadt (in the state of Hesse), the complex will cover an area of 20 hectares and require 600, 000 cubic metres of concrete as well as 65,000 tons of steel. Construction teams will be building a tunnel to house the heart of the complex, a ring accelerator with a circumference of 1.1 kilometres. The 24 buildings and tunnel sections provide 62,000 square metres of usable space and sufficient room for a total of 3.5 kilometres of beam control tubes as well as huge detectors and a complex technical infrastructure. The construction project is split into several modules. The first module concentrates on constructing the large accelerator ring (SIS 100) along with two smaller accelerator and storage rings, as well as a linear accelerator for protons (p-Linac). Another large accelerator ring, SIS 300, will be installed in the tunnel at a later stage. Space has also been allocated on the site for three further experimental and storage rings, also to be installed at a later date.  
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