Plasma parameters related to arc initiation on the tokamak first wall
- 1 June 1982
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 22 (6) , 823-826
- https://doi.org/10.1088/0029-5515/22/6/010
Abstract
The mechanism responsible for the initiation of unipolar arcs on the tokamak first wall is studied by measuring plasma parameters in the scrape-off layer. It is shown that a large electric field in the sheath region produced by runaway electrons is the dominant cause of the arc initiation. The difference in arc frequency in the toroidal direction on the limiter surface is explained by an asymmetry of the ion flux due to ion drift motion.Keywords
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