Author: Cojocaru, G.
Paper Title Page
TUPPT022 A 20 mA H Ion Source with Accel-Accel-Decel Extraction System at TRIUMF 198
  • K. Jayamanna, I. Aguilar, I.V. Bylinskii, G. Cojocaru, R.L. Dube, R.K. Laplante, W. L. Louie, M. Lovera, M. Minato, M. Mouat, S. Saminathan, T.M. Tateyama, E. Tikhomolov
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  During the last three decades, TRIUMF has developed H cusp ion sources for the 500 MeV, TR30, TR13 cyclotrons, as well as many other machines. These ion sources can be categorized as high current versions, producing up to 20mA of CW H beam within a normalized emittance (4RMS) of 0.6 π-mm-mrad. A new accel-accel-decel extraction system is being developed in order to run the source at optimum source extraction voltage for a large range of beam energies with minimal impact on beam properties. With this extraction system, beam energy can be as low as ~1keV and as high as 60keV while source extraction voltage can be at its optimum within 90kV. The source performances, as well as relevant emittance measurements, are discussed.  
TH1PB01 Operational Experience at the Intensity Limit in Compact Cyclotrons 432
  • G. Cojocaru, J.C. Lofvendahl
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  Compact cyclotrons are a cost-efficient choice for medical radioisotope production since negative hydrogen ions can be used at energies well below 100MeV. The stripping extraction technique allows quite large circulating currents without the need for separated turns. Space charge limits are in the range of 1 to 2 mA, but operating for long periods at these levels is a challenge for many reasons, among them being the sputtering of metal surfaces where unaccepted beam is deposited. These limits and others observed during our 22 years of 24hours/365days of quasi continuous operation of TR30 cyclotrons will be explored.  
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