DEVELOPMENT OF A TOROIDAL-FILTER H- ION-SOURCE

High brightness H- ion beams will be required for the next generation of accelerator-driven, neutron spallation sources. Volume H- ion sourc es have the potential for providing these beams at a high duty factor with moderate beam currents and with the long-term operational stabili ty and reliability needed. We report on the results of a continuing st udy of the Los Alamos National Laboratory version of a toroidal-filter , volume H- ion source which was designed to provide such beams. The H - beam cut-rent, emittance, and electron loading have been measured wi th the source equipped with a 3- and a 10-mm-diam emission aperture an d with several configurations of the plasma filter. The results are co mpared to beam simulations. (C) 1996 American Institute of Physics.