Abstract
A diagnostic neutral beam injector, based on the DINA-5F injector, is under development for the highly flexible TJ-II stellarator. The principal goals are to obtain spatially resolved charge-exchange recombination spectroscopy and neutral particle analysis measurements along the plasma minor radius and to stimulate opportunities for new physics studies. We first summarize relevant TJ-II characteristics and the considerations addressed when defining this compact system, for instance, the steps taken to minimize the impact of ferromagnetic shielding on magnetic configurations. We then outline the main aspects of the system and associated diagnostics. In particular, we highlight a bidirectional fiber-optic based multichannel spectrometer for obtaining Doppler measurements with high spatial resolution.
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