Negative ion based neutral injector: Beam formation and transport

Abstract

The essential feature of designed at Budker Institute of Nuclear Physics negative-ion-based neutral beam injector is the beam transport from the source to a single-aperture 0.5 ÷ 1 MeV accelerating tube trough a low energy beam transport line (LEBT). This scheme purifies the beam from the co-streaming fluxes of electrons, hydrogen atoms, molecules, and cesium vapor. As a result, the loading on the accelerating tube is considerably reduced. It will enable more stable operation of the accelerator. We report the first experimental results on 1.2 A, 85 keV H- beam transport through the LEBT to calorimeter.