Transport of injected impurities in Heliotron E
- 1 September 1984
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 24 (9) , 1205-1211
- https://doi.org/10.1088/0029-5515/24/9/010
Abstract
Impurities have been injected into Heliotron E in order to study the transport properties of currentless plasmas. In ECH-produced plasmas, the observed impurity transport can be described by purely anomalous diffusion, with a coefficient of the order of D = 2000–5000 cm2 s−1. During neutral beam operation, the impurity transport can be characterized by considerably weaker diffusion, combined with inward convection. Convection velocities as large as a few hundred centimetres per second are inferred.Keywords
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