Abstract
An HCN laser (λ = 337 μm) interferometer with a high time resolution has been developed in a helical device, Heliotron J, for the study of plasma confinement and transport. Using the new interferometer in combination with a microwave interferometer, a gas puff modulation experiment has been performed to clarify the particle transport in ECH and ECH + NBI heated plasmas. Based on the particle balance equation, the diffusion coefficient D and the convection velocity V are evaluated on the assumption of profile shapes for D, V and particle source. The result indicates that ECH plasma has better particle transport characteristics, smaller value on D and V, than the case of NBI heated plasmas. The influence of the source profile shape on this analysis is considered, because there is ambiguity on the edge plasma parameters around LCFS, which determines the source profile shape. Although evaluated values of D and V can depend on the source profiles, the difference still remains within the error bars at the present accuracy in this experimental condition, suggesting that more careful treatment of the assumption on particle source is required for the particle transport study with higher accuracy.
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