Abstract
A directional Langmuir probe was designed and fabricated for measurement of ion flow in the RF plasma source, DT-ALPHA, in order to understand plasma structure in divertor study. Radial distribution and circumferential distribution of ion saturation current for He plasma were measured using the directional Langmuir probe. Ion flow velocity was obtained. A calibration factor was determined by comparing the radial profile of the azimuthal ion flow with E × B drift velocity and diamagnetic drift velocity.
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