SPIDER in the Roadmap of the ITER Neutral Beams
2019
Abstract To reach fusion conditions and control plasma configuration in ITER, a suitable combination of additional heating and current drive systems is necessary. Among them, two Neutral Beam Injectors (NBI) will provide 33 MW hydrogen/deuterium particles electrostatically accelerated to 1 MeV; efficient gas-cell neutralisation at such beam energy requires negative ions, obtained by
caesium-catalysed surface conversion of atoms inside the
ion source. As ITER NBI requirements have never been simultaneously attained, a Neutral Beam Test Facility (NBTF) was set up at Consorzio RFX (Italy), including two experiments. MITICA is the
full-scaleNBI prototype with 1 MeV particle energy. SPIDER, with 100 keV particle energy, aims at testing and optimising the
full-scale
ion source: extracted beam uniformity, negative
ion currentdensity (for one hour) and beam optics (
beam divergence
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