Modification of the internal electric field by biasing of the divertor plates in the Tokamak de Varennes (TdeV)

The radial electric field inside the separatrix has been deduced from spectroscopic measurements of impurities on TdeV (Tokamak de Varennes), using the reduced radial momentum balance and two neoclassical models [R. D. Hazeltine, Phys. Fluids 17, 961 (1974) and Y. B. Kim, P. H. Diamond, and R. J. Gr...

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Bibliographic Details
Published in:Physics of plasmas 1997-10, Vol.4 (10), p.3644-3654
Main Authors: Lafrance, D., Huang, R., Stansfield, B. L., Haddad, E., Lachambre, J.-L.
Format: Article
Language:English
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Summary:The radial electric field inside the separatrix has been deduced from spectroscopic measurements of impurities on TdeV (Tokamak de Varennes), using the reduced radial momentum balance and two neoclassical models [R. D. Hazeltine, Phys. Fluids 17, 961 (1974) and Y. B. Kim, P. H. Diamond, and R. J. Groebner, Phys. Fluids B 3, 2050 (1991)]. The results from all three models are in fair agreement. Furthermore, the electric field has been deduced using the same models both with and without biasing the divertor plates relative to the machine wall, showing an inward propagation of the effect of the biasing created in the scrape-off layer (SOL). Undeniably, the electric field has been modified well inside the separatrix (0.6≲r/a≲0.9), revealing the possibility of modifying the internal electric field by external means.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.872260