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Steady state scenarios in magnetic fusion meet two conflicting requirements: on the one hand, current drive favours low-density scenarios, on the other hand, relevant power extraction by the divertor is only achieved at high density. Generation of large fraction of bootstrap current is a means to overcome these difficulties by lowering the contribution of the externally driven current. A test of this line of thought has been achieved on Tore Supra with the ergodic divertor (ED) with low field and low plasma current target plasmas, where and increase of Beta(p) has a significant impact on bootstrap current. Working gas was deuterium, with typically 4-8% fraction of hydrogen.

Additional information

Authors: NGUYEN F ET AL, CEA, Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral report given at: 27th EPS Conference on Controlled Fusion and Plasma Physics, Budapest (HU). Held in: 12-16 June 2000. Published in Europhysics Conference Abstracts, Vol.24B (2000), pp.796-799
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