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Triple Electrode in Edge Plasma of STP-3M Reversed Field Pinch

✍ Scribed by A. Matsuoka; H. Kajikawa; M. Sugawara; S. Maki; H. Arimoto; K. I. Sato

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 432 KB
Volume: 38
Category: Article
ISSN: 0005-8025
DOI: 10.1002/ctpp.19980380113

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✦ Synopsis

The behaviour of edge plasma in STP-3M Reversed Field Pinch is investigated by using a probe with triple electrode. It can be scanned from the boundary of the confined plasma to 122 mm outside and simultaneously measure three signals, such as floating potential, and ion and electron saturation currents. Measurements of the edge plasma far from the confined region made clear that energetic ions are emitted from the core plasma to the outside. The energetic ions are accompanied with the clumps of electrons. Furthermore, measurements by using the probes with three electrodes show that these ions go through energetic electrons in the limiter shadow. These energetic electrons flowing the edge region drive the inversed current to the main current driving in the core region.

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