Cyclotron gas stopper: simulations and predicted performance

ORAL

Abstract

Projectile fragmentation followed by in-flight separation provides fast, chemistry-independent access to a wide range of $\beta$-unstable nuclides. To optimize their use, these exotic beams should be available at energies from rest to several MeV/u. This can be achieved by stopping fast beams in a volume of helium, extracting the stopped ions, and reaccelerating them to the desired energy. A ``cyclotron gas stopper'' has been proposed to overcome the limitations of current and proposed linear gas stoppers. The current design of the NSCL cyclotron-stopper uses a 2 meter diameter superconducting spiral-sector magnet with ion-guiding carpets in the central region. Complete simulations have been performed starting with realistic beam properties for 17 projectile fragments ranging from $^{6}$Li to $^{150}$I. Details of the NSCL cyclotron-stopper and the simulation package developed to predict its performance will be presented.

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Authors

  • C.M. Campbell

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA
    • National Superconducting Cyclotron Laboratory, Michigan State University

  • S. Chouhan

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • C. Guenaut

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • D. Lawton

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • F. Marti

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • J. Ottarson

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • S. Schwarz

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • A.F. Zeller

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • P. Zavodszky

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA

  • G. Bollen

    • National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA

  • D.J. Morrissey

    • National Superconducting Cyclotron Laboratory and Department of Chemistry, Michigan State University, East Lansing, MI, USA

  • G. Pang

    • National Superconducting Cyclotron Laboratory and Department of Chemistry, Michigan State University, East Lansing, MI, USA