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Goulding, R. H.

Paper Title Page
FROAAB02 Advanced RF-Driven H- Ion Sources at the SNS 3774
  • R. F. Welton, J. R. Carmichael, J. Carr, D. W. Crisp, R. H. Goulding, Y. W. Kang, N. P. Luciano, S. Murray, M. P. Stockli
    ORNL, Oak Ridge, Tennessee
  The power upgrade of the US Spallation Neutron Source* (SNS) will require substantially higher average H- beam current from the ion source than can be produced using the baseline source. H- currents of 70-100 mA with an RMS emittance of 0.20-0.35 mm mrad, respectively, and a ~7% duty-factor will have to be injected into the accelerator. We are, therefore, investigating several advanced ion source concepts based on RF-excited plasmas. We have designed and tested three inductively coupled ion sources featuring external antennas. First, a simple prototype source was developed based on a ceramic plasma chamber and no magnetic plasma confinement. Next, a source featuring an internal Faraday shield with integrated magnetic multicusp plasma confinement was investigated as well as an ion source based on an AlN plasma chamber and external multicusp confinement field. H- generation in each source is quantified and compared. Also, experiments investigating the possibility of using helicon-wave coupling were performed and are reported. Finally, an advanced elemental Cs collar and feed system was developed and tested with each source.

ORNL/SNS is managed by UT-Battelle, LLC, for the U. S. Department of Energy under contract DE-AC05-00OR22725