Author: Broderick, N.
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TUPML030 Optimisation of D- Ion Production in a Multicusp Ion Source 1609
  • A.M. George, M.P. Dehnel, S.V. Melanson, D.E. Potkins
    D-Pace, Nelson, British Columbia, Canada
  • N. Broderick
    University of Auckland, Auckland, New Zealand
  • H.C. McDonald, C. Philpott
    BSL, Auckland, New Zealand
  D-Pace's multicusp ion source achieves high beam cur-rents for negative hydrogen ions in both the TRIUMF-licensed filament-powered ion source (~18 mA) and the University of Jyväskylä-licensed RF-powered ion source (~8 mA) [1]. It is well known that ion sources producing negative deuterium ions achieve lower beam currents compared to similar negative hydrogen ion sources and indeed we have found that negative deuterium ion beam currents in our sources are typically 1/3 that of negative hydrogen beam currents. The reasons behind this are not completely understood, but factors such as the magnetic field strength and the electron temperature are believed to play a major role and offer the potential for significant optimisation. In this paper, we look into the issues surrounding swapping of deuterium for hydrogen in our ion source by studying the properties of plasmas and extracted currents with different magnetic field strengths and gas flows.  
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