Author: Kwan, E.
Paper Title Page
FR1PB03 The Radio Frequency Fragment Separator: A Time-of-Flight Filter for Fast Fragmentation Beams 467
  • T. Baumann, D. Bazin, T.N. Ginter, E. Kwan, J. Pereira, C. Sumithrarachchi
    NSCL, East Lansing, Michigan, USA
  Funding: Supported by the National Science Foundation under Grants PHY02-16783, PHY-06-06007, and PHY-11-02511.
Rare isotope beams produced by fragmentation of fast heavy ion beams are commonly separated using a combination of magnetic rigidity selection (mass to charge ratio) and energy-loss selection (largely dependent on proton number) using magnetic fragment separators. This method offers isotopic selection of the fragment of interest, however, the purity that can be achieved depends on the rigidity of the rare isotope with respect to more abundant fragments. This poses a problem specifically for neutron-deficient isotopes (towards the proton drip line) where much more abundant isotopes closer to stability can not be separated out. A separation by time-of-flight can further suppress such isotonic contaminants. The Radio Frequency Fragment Separator* deflects isotopes based on their phase relative to the cyclotron RF using a transverse electric RF field, effectively separating by time-of-flight. This method is in use for the production of neutron deficient rare isotope beams at NSCL.
*D. Bazin et al., Nucl. Inst. and Meth. A 606 (2009) 314-319
slides icon Slides FR1PB03 [4.324 MB]