Experimental Study of the Ion Critical-Gradient Length and Stiffness Level and the Impact of Rotation in the JET Tokamak

P. Mantica, D. Strintzi, Tuomas Tala, et al

Research output: Contribution to journalArticleScientificpeer-review

110 Citations (Scopus)

Abstract

Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R=LTi ¼ RjrTij=Ti) 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=LTi, 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.
Original languageEnglish
Article number175002
Number of pages5
JournalPhysical Review Letters
Volume102
Issue number17
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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stiffness
ion temperature
gradients
linear prediction
ions
extrapolation
temperature gradients
critical temperature
deviation
thresholds
profiles
predictions

Cite this

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title = "Experimental Study of the Ion Critical-Gradient Length and Stiffness Level and the Impact of Rotation in the JET Tokamak",
abstract = "Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R=LTi ¼ RjrTij=Ti) 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 comparedwith linear and nonlinear predictions of the gyrokinetic code GS2. Plasmas with higher values of toroidal rotation show a significant increase in R=LTi, 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.",
author = "P. Mantica and D. Strintzi and Tuomas Tala and et al",
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Experimental Study of the Ion Critical-Gradient Length and Stiffness Level and the Impact of Rotation in the JET Tokamak. / Mantica, P.; Strintzi, D.; Tala, Tuomas; al, et.

In: Physical Review Letters, Vol. 102, No. 17, 175002, 2009.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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AU - Mantica, P.

AU - Strintzi, D.

AU - Tala, Tuomas

AU - al, et

PY - 2009

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N2 - Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R=LTi ¼ RjrTij=Ti) 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 comparedwith linear and nonlinear predictions of the gyrokinetic code GS2. Plasmas with higher values of toroidal rotation show a significant increase in R=LTi, 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.

AB - Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R=LTi ¼ RjrTij=Ti) 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 comparedwith linear and nonlinear predictions of the gyrokinetic code GS2. Plasmas with higher values of toroidal rotation show a significant increase in R=LTi, 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.

U2 - 10.1103/PhysRevLett.102.175002

DO - 10.1103/PhysRevLett.102.175002

M3 - Article

VL - 102

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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