Abstract
Neutral particle dynamics is measured in the edge plasma of the TRIAM-1M tokamak by means of the Zeeman patterns in the spectral shape. This measurement can provide the emission position with high spatial resolution, as well as the local drift velocity and temperature. In the TRIAM-1M, the inward neutral flow velocity driven by the radial neutral pressure gradient is observed. The temporal evolution of the flow velocity suggests that the distance between the last closed flux surface and the first wall changes the recycling flux. Thereby, the neutral pressure gradient and the neutral flow velocity are varied. This technique can be an effective way for the measurement of the local neutral behaviour in the edge region.
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