DEVELOPMENT OF A D+ SOURCE FOR INTERNATIONAL FUSION MATERIALS IRRADIATION FACILITY

A volume source, based on the high efficiency ion source (HIEFS), is b eing developed for D+ production in steady state operation. The source will be optimized for the extraction of atomic deuterium ions with hi gh current densities. It was found that a maximum deuterium ion beam c urrent density of 210 mA/cm(2) can be achieved with a D+ fraction abov e 90%. At an extraction voltage of 35 kV and with an aperture radius o f 4 mm, the source delivers 61 mA D+. After a description of the sourc e and the experimental setup, the results of detailed studies of the b eam composition in dependence of the plasma parameters are presented. (C) 1996 American Institute of Physics.