JET EFDA contributors (Including: UNSPECIFIED). (2006) Identifying Alfven eigenmodes in the early phase of advanced tokamak plasmas. PLASMA PHYSICS AND CONTROLLED FUSION, 48 (2). pp. 295-313. doi:10.1088/0741-3335/48/2/008 ISSN 0741-3335.

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Abstract

We examine the fast-ion driven Alfven eigenmodes (AEs) in the frequency range 0-500 kHz during the current ramp-up phase of advanced JET plasma before the main heating starts (the preheating phase). Modelling of AEs using equilibrium reconstruction and the ideal MHD spectral code MISHKA shows that three types of mode commonly found during the preheating phase correspond to: global toroidal Alfven eigenmodes (TAEs) found in regions of moderate to high magnetic shear; core-localized TAEs found in regions of low magnetic shear; and Alfven cascades found in regions of zero shear. MHD spectroscopy diagnosis of the time evolution of the plasma current within the central region of the plasma and of the minimum safety factor value based upon the frequency evolution of these unstable AEs is discussed.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PLASMA PHYSICS AND CONTROLLED FUSION
Publisher:	IOP PUBLISHING LTD
ISSN:	0741-3335
Official Date:	February 2006
Dates:	Date Event February 2006 UNSPECIFIED
Volume:	48
Number:	2
Number of Pages:	19
Page Range:	pp. 295-313
DOI:	10.1088/0741-3335/48/2/008
Publication Status:	Published

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