The dependence of ion heat transport on the ion to electron temperature ratio in JET non-rotating plasmas

P. Migliano, P. Mantica, B. Baiocchi, A. Casati, J. Citrin, C. Giroud, N. Hawkes, E. Lerche, M. Tsalas, D. Eester, van

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Abstract

Detailed experimental studies of ion heat transport are carried out in JET to explore the Te/Ti dependence of ion heat transport in ITER relevant range of parameters (Te/Ti = 1) using low rotation plasmas with dominant ion cyclotron resonance heating to avoid the coupling of the effects of Te/Ti and rotation which affected previous experiments. This experimental setup has led to an accurate determination of the ion temperature gradient (ITG) threshold at varying Te/Ti, offering unique opportunities for validation of the well-established theory of ITG driven modes. A rather mild decrease in threshold with increasing Te/Ti in the interval of ITER interest was found. The new experimental result has found good agreement with theoretical predictions based on quasi-linear fluid and linear gyrokinetic models.
Original languageEnglish
Article number055003
Pages (from-to)055003-1/8
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume55
Issue number5
DOIs
Publication statusPublished - 2013

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