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Measurement of the damping rate of n=1 toroidal Alfven eigenmodes as a function of the neutral beam heating power and plasma beta on JET
KTH, Superseded Departments, Numerical Analysis and Computer Science, NADA.
2003 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 43, no 8, 724-728 p.Article in journal (Refereed) Published
Abstract [en]

The dependence of the measured damping rate upon the neutral beam heating power (P-NBI) and plasma beta has been experimentally investigated for n = 1 toroidal Alfven eigenmodes (TAEs) in JET limiter plasmas with a monotonic safety factor profile and low edge magnetic shear. The mode frequency is observed to decrease with increasing beta, as predicted by various theoretical models. For low P-NBI < 3 MW, a single n = 1 TAE splits into two modes closely spaced around the expected TAE frequency, and the mode damping rate decreases with increasing beta. On the other hand, at higher P-NBI > 6 MW, no frequency splitting is observed and there are indications that the mode damping rate increases with increasing beta.

Place, publisher, year, edition, pages
2003. Vol. 43, no 8, 724-728 p.
Keyword [en]
joint european torus, tokamak plasmas, stability
Identifiers
URN: urn:nbn:se:kth:diva-22792ISI: 000185180800013OAI: oai:DiVA.org:kth-22792DiVA: diva2:341490
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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