Author: Dimopoulou, C.
Paper Title Page
TUM12
 Scaling Laser Cooling of Ion Beams towards High Beam Energies  
 
  • M.H. Bussmann, M. Löser, U. Schramm
    HZDR, Dresden, Germany
  • T. Beck, G. Birkl, D. Kiefer, S. Klammes, W. Nörtershäuser, S. Tichelmann, J. Ullmann, T. Walther
    TU Darmstadt, Darmstadt, Germany
  • O. Boine-Frankenheim, C. Dimopoulou, L. Eidam, T. Giacomini, C. Kozhuharov, Yu.A. Litvinov, M. Lochmann, W. Nörtershäuser, F. Nolden, R.M. Sanchez Alarcon, M.S. Sanjari, P.J. Spiller, M. Steck, T. Stöhlker, J. Ullmann, D.F.A. Winters
    GSI, Darmstadt, Germany
  • O. Boine-Frankenheim, L. Eidam
    TEMF, TU Darmstadt, Darmstadt, Germany
  • A. Buss, V. Hannen, D. Winzen
    Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, Germany
  • X. Ma, H.B. Wang, W.Q. Wen, J. Yang
    IMP/CAS, Lanzhou, People's Republic of China
  • U. Schramm
    TU Dresden, Dresden, Germany
  • M. Siebold
    Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany
  • T. Stöhlker
    HIJ, Jena, Germany
  
  Laser cooling has proven to be a viable technique for reducing the longitudinal phase space volume of bunched ion beams up to relativistic energies. Moreover, the fluorescence emitted from the ions due to deexcitation of the laser-excited cooling transition can serve as a powerful tool for atomic physics, e.g. for spectroscopy of fast transitions in highly charged ions, but also as a versatile diagnostic that can be seen as complimentary to standard, charge-based diagnostic techniques. In this presentation we will discuss how to design laser cooling setups for future high energy ion beam facilities such as FAIR and HIAF with special emphasis on the laser ion beam interaction and the resulting demands on laser systems used for reliable, turn-key laser cooling setups. We will present the state of the art of laser cooling, presenting recent results from beam times at ESR, GSI Darmstadt, and CSRe, IMP Lanzhou.  
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TUP16 Latest News from Stochastic Cooling Developments for the Collector Ring at FAIR 64
 
  • R. Hettrich, A. Bardonner, R.M. Böhm, C. Dimopoulou, C. Peschke, A. Stuhl, S. Wunderlich
    GSI, Darmstadt, Germany
  • F. Caspers
    ESI, Archamps, France
  • F. Caspers
    CERN, Geneva, Switzerland
  
  The CR stochastic cooling system aims at fast 3D cooling of antiprotons, rare isotopes and stable ions. Because of the large apertures and the high gain needed to cool the hot secondary beams, damping within the 1-2 GHz band of the unwanted microwave modes propagating through the vacuum chambers is essential. It will be realised with UHV- compatible, resistively coated ceramic tubes and ferrites. The greatest challenge is increasing the signal to noise ratio for antiproton cooling by means of cryogenic movable (plunging) pickup electrodes, which follow the shrinking beam during cooling and then withdraw fast before the new injection. Linear motor drive units plunge synchroneously the pickup electrodes on both sides of the ion beam (horizontal/vertical). Their technical (mechanical, electrical, controls) concept and specification is summarized. Their performance has been demonstrated in successive measurements inside testing chambers at GSI. Recent simulations of the critical antiproton cooling with the designed system are shown. Longitudinal cooling and its simultaneous transverse cooling are studied with the Fokker-Planck code and with an analytical model, respectively.  
poster icon Poster TUP16 [4.474 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP16  
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THM11
 Systematic Measurements with Electron Cooled Bunched Heavy Ion Beams  
 
  • R. Hess, C. Dimopoulou, M. Steck
    GSI, Darmstadt, Germany
  
  The results of systematic studies with electron-cooled bunched beams of highly charged ions at the Experimental Storage Ring ESR at GSI Helmholtzzentrum GmbH, Darmstadt are presented. The series of experiments were conducted during the beamtime block in 2016 for different ion species as well as ion beam energies. In these measurements, we recorded all three beam phase space planes simultaneously with high resolution, using a recently installed fast current transformer (to measure the bunch length, hence deduce the momentum spread) and ionization profile monitors (to measure horizontal and vertical emittances). A comparison of the results with those obtained with coasting beams is given as well.  
slides icon Slides THM11 [3.032 MB]  
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