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The development of the Single Aperture, Single Gap 1 MV accelerator (SINGAP) is being carried out on the 1 MV test bed at the DRFC, CEA Cadarache, France. This paper reports on the latest performance achieved with the prototype, “ITER-like” accelerator, 730 keV, 120 A/m2 D-, and of on-going measurements of the beam “halo” fraction, ≈10%. It reviews the status and plans for future studies on D- production, and the observed “dark current”, and presents the basic physics design of a system that should cope with the ≈3 MW of electrons that would be co-accelerated out of the 1 MeV, 40 A, D- SINGAP accelerator proposed for the ITER neutral beam injectors. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]