Abstract
In order to study impurity transport and their progression in theplasma, small amount of high-Z impurities were injected into HL-2Aohmic heated plasmas by laser blow-off and traced with good spatialtemporal resolution by a soft X-ray camera. An analysis of theevolution of the impurities' radiation distribution in the plasmarevealed that impurity transport in the central region wasprofoundly different from that outside of it. It was found that thesawteeth tended to be inverted on the central soft X-ray chordsignals after the impurity injection and the soft X- ray profilesexhibited discontinuities during the movement of the impurities inthe plasma central region. Detailed 2D visualization of theevolution of impurities' radiation using computer tomography hasprovided further understanding of the properties of impuritytransport in the HL-2A plasma.
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