Powerful cw proton linear accelerators (100 mA at 0.5-1.0 GeV) are being proposed for spallation neutron-source applications. A 75-keV, 110-mA de proton injector using a microwave ion source is being tested for these applications. It has achieved 80-keV, 110-mA hydrogen-ion-beam operation. Video and de beam-current toroid diagnostics are operational, and an EPICS control system is also operational on the 75-keV injector. A technical base development program has also been carried out on a 50-keV injector obtained from Chalk River Laboratories, and it includes low-energy beam transport studies, ion source lifetime tests, and proton-fraction enhancement studies. Technical base results and the present status of the 75-keV injector will be presented. (C) 1996 American Institute of Physics. References: 34
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