Abstract
Two enhanced Positive Ion Neutral Injectors (PINIs) have been constructed and tested at the JET Neutral Beam Test Bed. Both were capable of producing ≥ 50 A of Deuterium beam at 140 kV acceleration and were conditioned within reasonable time (≤ 1500 beam on seconds). Two upgraded PINIs have excellent optical properties, particularly the PINI with the tetrode accelerator which has the lowest beam divergence ever seen for such positive ion multi-aperture source — 0.25°. Total extracted beam power of ≤ 8 MW for single PINI, and power density in the beam centre > 250 MW/m2, are also record values obtained so far at JET. Beam power densities are above or very close to the design limits of present JET injector beamline components (scrapers, calorimeters and dumps). One neutral injector box fitted with eight such PINIs would be capable of delivering >15 MW of Deuterium neutral beam power and >19 MW of Tritium neutral beam power into the JET plasma.
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