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A compact diagnostic neutral beam injector, designed for performing spatially resolved charge exchange recombination spectroscopy and neutral particle analysis measurements, has begun operation on the highly flexible TJ-II stellarator. The injector, an upgraded DINA-5 model, is supported on a mobile cradle that permits its path through the plasma to be varied by ±3° poloidally. In parallel, a dedicated bidirectional (two vertical opposing views) multichannel spectroscopic diagnostic, incorporating fiber arrays, an f∕1.8 spectrograph, and a back-illuminated charge-coupled device, has been installed to obtain Doppler line shifts and widths (around 529.2nm) with ∼1cm spatial resolution. In this article, the principal aspects of the charge exchange recombination spectroscopy diagnostic system are summarized, its initial performance is evaluated, preliminary results are presented, and future upgrades are outlined.
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Carmona et al. (2006) studied this question.
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