Abstract
High-voltage negative-ion based injector is under development at Budker Institute of Nuclear Physics. Production and transport of negative ion beam are studied at separate test stand, consisted of a long-pulse RF surface-plasma source and a low energy beam transport line (LEBT). Deflecting magnets and two high speed 105 l/s cryopumps, that are installed in LEBT, purifies the beam from the co-streaming fluxes of electrons, hydrogen atoms and molecules, and cesium vapor. Paper presents the experimental results on 1 A, 90 keV H− beam production and transport through the LEBT to the multisection calorimeter installed at distance 3.5 m from the source. The parameters of the transported beam were measured at distance 1.6 m by the movable Faraday cup and at the LEBT exit – by beam calorimeter. The efficiency of beam transport vs various source and LEBT parameters will be presented and discussed.
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