On ion cyclotron current drive for sawtooth control
2006 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 46, no 10, S951-S964 p.Article in journal (Refereed) Published
Experiments using ion cyclotron current drive (ICCD) to control sawteeth are presented. In particular, discharges demonstrating shortening of fast ion induced long sawteeth reported in (Eriksson et al 2004 Phys. Rev. Lett. 92 235004) by ICCD have been analysed in detail. Numerical simulations of the ICCD driven currents are shown to be consistent with the experimental observations. They support the hypothesis that an increase in the magnetic shear, due to the driven current, at the surface where the safety factor is unity was the critical factor for the shortening of the sawteeth. In view of the potential utility of ICCD, the mechanisms for the current drive have been further investigated experimentally. This includes the influence of the averaged energy of the resonating ions carrying the current and the spectrum of the launched waves. The results of these experiments are discussed in the light of theoretical considerations.
Place, publisher, year, edition, pages
2006. Vol. 46, no 10, S951-S964 p.
toroidal plasmas, jet, waves, tokamak, physics, period
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-16126DOI: 10.1088/0029-5515/46/10/S12ISI: 000242004100012ScopusID: 2-s2.0-33749068424OAI: oai:DiVA.org:kth-16126DiVA: diva2:334168
QC 20100525 QC 20110927. Conference: 9th IAEA Technical Meeting on Energetic Particles in Magnetic Confinements Systems. Takayama, JAPAN. NOV 09-11, 2005 2010-08-052010-08-052011-09-28Bibliographically approved