Abstract

The next generation spallation neutron sources, such as the upgrade to the Los Alamos Neutron Science Center (LANSCE) will require high intensity negative hydrogen (H/sup -/) beams. The new LANSCE source in particular will need to generate 40 mA of H/sup -/ beam current at a duty factor of 12% (1 ms pulse at 120 Hz). One option that we are currently studying concerns altering the existing LANSCE source to utilize an RF induction plasma discharge. However, before proceeding with any changes a full understanding and optimization of our current prototype ion source was required. This surface conversion source, similar to the present LANSCE source, will be used as a benchmark against which to measure future modifications, as well as to provide direction for those modifications. Results to date along with future plans will be presented.

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