Author: Abegglen, F.P.
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MOC2 Charge-Breeding of Radioactive Ions at the Texas A&M Cyclotron Institute 20
  • D.P. May, J. Arje
    Texas A&M University Cyclotron Institute, College Station, Texas, USA
  • F.P. Abegglen, G. Tabacaru
    Texas A&M University, Cyclotron Institute, College Station, Texas, USA
  Funding: U. S. Dept of Energy Grant DE-FG02-93ER40773
Singly charged, radioactive ions produced in an Ion Guide Isotope Separation On-Line (IGISOL) target cell have been charge-bred in an ECR ion source and subsequently accelerated to high energy by the K500 cyclotron at Texas A&M University. The 1+ ions were accelerated to near the extraction voltage of the ECRIS and then decelerated through the injection-end magnetic mirror field of the ECRIS. The charge-breeding efficiency was only at most 1%, and as a consequence another method of injection into the ECRIS is being attempted. As an experiment an alkali 1+ ion source was placed at the entrance of a 0.4 meter long rf-only sextupole ion-guide (SPIG) held near the extraction voltage of the ECRIS, and the exit end of the SPIG placed on axis near the maximum axial magnetic field at the injection end of the ECRIS. This arrangement resulted in good charge-breeding efficiency, perhaps as much as 10% into one charge-state, although this was difficult to quantify due to the difficulty of measuring the output from the SPIG. Direct injection of 1+ radioactive ions via a longer (2.5 m) SPIG transporting products from the IGISOL target cell is now being implemented and will be reported on.
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