Mantica, P., Strintzi, D., Tala, T., Giroud, C., Johnson, T., Leggate, H., Lerche, E., Loarer, T., Peeters, A. G., Salmi, A., Sharapov, S. E. (Sergei E.), Van Eester, D., de Vries, P. C., Zabeo, L. and Zastrow, K. -D. (2009) Experimental study of the ion critical-gradient length and stiffness level and the impact of rotation in the JET tokamak. Physical Review Letters, Vol.102 (No.17). Article: 175002. doi:10.1103/PhysRevLett.102.175002

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Abstract

Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R/L-Ti = R vertical bar del T-i vertical bar/T-i) for the onset of ion temperature gradient modes and the stiffness of Ti profiles with respect to deviations from the critical value. Threshold and stiffness have been compared with linear and nonlinear predictions of the gyrokinetic code GS2. Plasmas with higher values of toroidal rotation show a significant increase in R/L-Ti, which is found to be mainly due to a decrease of the stiffness level. This finding has implications on the extrapolation to future machines of present day results on the role of rotation on confinement.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	1 May 2009
Dates:	Date Event 1 May 2009 Published
Volume:	Vol.102
Number:	No.17
Number of Pages:	5
Page Range:	Article: 175002
DOI:	10.1103/PhysRevLett.102.175002
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Communities

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