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On Current Drive and Wave Induced Bootstrap Current in Toroidal Plasmas
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
2008 (English)In: Theory of Fusion Plasmas: Joint Varenna - Lausanne International Workshop, Melville, New York, USA: AMER INST PHYSICS , 2008, 88-99 p.Conference paper (Other academic)
Abstract [en]

A comprehensive treatment of wave-particle interactions in toroidal plasmas including collisional relaxation. applicable to heating or anomalous wave induced transport, has been obtained by using Monte Carlo operators satisfying quasi-neutrality. This approach enables a self-consistent treatment of wave-particle interactions applicable to the banana regime in the neoclassical theory. It allows an extension into a regime with large temperature and density gradients, losses and transport of particles by wave-particle interactions making the method applicable to transport barriers. It is found that at large gradients the relationship between radial electric field, parallel velocity, temperature and density gradient in the neoclassical theory is modified such that coefficient in front of the logarithmic ion temperature gradient, which in the standard neoclassical theory is small and counteracts the electric field caused by the density gradient, now changes sign and contributes to the built up of the radial electric field. The Possibility to drive current by absorbing the waves on trapped particles has been studied and flow the wave-particle interactions affect the bootstrap current. Two new current drive mechanisms are studied: current drive by wave induced bootstrap current and selective detrapping into passing orbits by directed waves.

Place, publisher, year, edition, pages
Melville, New York, USA: AMER INST PHYSICS , 2008. 88-99 p.
, AIP Conference Proceedings, ISSN 0094-243X ; 1069
Keyword [en]
Current drive, Monte Carlo Operators, Neoclassical theory
National Category
Natural Sciences
URN: urn:nbn:se:kth:diva-86057ISI: 000262074400008ISBN: 978-0-7354-0600-1OAI: diva2:500386
Theory of Fusion Plasmas,Joint Varenna - Lausanne International Workshop, Varenna, Italy 2008
QC 20120215Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-02-23Bibliographically approved

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Hellsten, TorbjörnJohnson, Thomas
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