Author: Steck, M.
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MOPAM2R2
 Cooling of Rare Isotope Beams in the ESR Storage Ring  
 
  • M. Steck, R. Hess, R. Joseph, S.A. Litvinov, B. Lorentz, C. Peschke, J. Roßbach, S. Wunderlich
    GSI, Darmstadt, Germany
  
  Beam cooling is the most important technique for the preparation of stored secondary beams in the ESR storage ring. The rare isotope beams are produced in a thick target by fragmentation of a heavy ion primary beam. The low intensity of the secondary beam can be increased by longitudinal accumulation schemes which use both stochastic and electron cooling of the injected beam. The conflict between the high energy of the heavy ion beam needed to produce highest intensities of rare isotopes and the request of some experiments for much lower energies can be resolved by deceleration of the secondary beam in the ESR. The efficiency of deceleration crucially depends on the low emittance and momentum spread of the beam when deceleration starts. Electron cooling at intermediate energies in the course of the deceleration and at the final energy is an additional asset to the goal of efficient deceleration to lowest energies and optimum conditions for experiments. The report gives an overview of various aspects of beam cooling in the endeavor to prepare highest beam quality and luminosity for experiments with stored secondary beams in the ESR.  
slides icon Slides MOPAM2R2 [8.704 MB]  
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TUPPM2R3
 Laser Cooling of Stored Bunched Relativistic Carbon Ions at the ESR, using a Novel Tunable High Repetition Rate Pulsed Laser System  
 
  • S. Klammes, L.H.J. Bozyk, T. Kühl, W. Nörtershäuser, R.M. Sanchez Alarcon, P.J. Spiller, M. Steck, T. Stöhlker, D.F.A. Winters
    GSI, Darmstadt, Germany
  • M.H. Bussmann
    CASUS, Görlitz, Germany
  • M.H. Bussmann, U. Schramm, M. Siebold
    HZDR, Dresden, Germany
  • D.Y. Chen, Z. Huang, X. Ma, H.B. Wang, W.Q. Wen
    IMP/CAS, Lanzhou, People’s Republic of China
  • N. Eizenhöfer, M. Horst, B. Langfeld, W. Nörtershäuser, T. Walther
    TU Darmstadt, Darmstadt, Germany
  • V. Hannen, K. Ueberholz
    Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, Germany
  • N. Kiefer
    Universität Kassel, Kassel, Germany
  • W. Nörtershäuser, T. Walther
    HFHF, Frankfurt am Main, Germany
  • U. Schramm
    TU Dresden, Dresden, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • T. Stöhlker
    HIJ, Jena, Germany
  
  Funding: We acknowledge the support by BMBF ErUM-FSP APPA for the laser systems (05P16ODFA1, 05P15RDFA1, 05P12RDRB2 and 05P09RDFA3) and the detector systems (05P19PMFA1), and by Helmholtz POF IV MT ARD (ST2).
Laser cooling at storage rings has proven to be a powerful technique to obtain ion with a very small relative longitudinal momentum spread (1E-6 range). This contribution will give an overview of the principle and status of bunched beam laser cooling at the experimental storage ring ESR at GSI, Germany. Results from a recent laser cooling beamtime in May 2021 at the ESR will be presented, where broadband laser cooling of bunched relativistic C3+ ion beams was successfully demonstrated for the first time using a sophisticated pulsed UV laser system with a very high repetition rate (~ MHz), variable pulse durations (166 - 735 ps) and high UV power (> 250 mW). 		 
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