PPPL-3637rev is available in <a href="PPPL-3637rev.pdf">pdf</a> format.

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<b>Microturbulence and Flow Shear in High-performance JET ITB Plasma
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<b>Authors:</b> R.V. Budny, R. Andre, A. B&#233;coulet, C. Challis, G.D. Conway, W. Dorland, D.R. Ernst, T.S. Hahm, T.C. Hender, D. McCune, G. Rewoldt, S.E. Sharapov, and contributors to the EFDA-JET Workprogramme

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<b>Date of PPPL Report:</b> December 2001<BR>
<b>Date of Revised PPPL Report:</b> February 25, 2002
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<b>Published in:</b> Plasma Physics and Controlled Fusion <b>44</b> (June 2002) 1215-1228.</p>


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The transport, flow shear, and linear growth rates of microturbulence are studied for a JET plasma with high central q in which an internal transport barrier (ITB) forms and grows to a large radius. The linear microturbulence growth rates of the fastest growing (most unstable) toroidal modes with high toroidal mode number are calaculated using the GS2 and FULL gyrokinetic codes. These linear growth rates, <font face = "symbol">g</font face = "symbol"><sub>lin</sub>, are large, but the flow-shearing rates, <font face = "symbol">g</font face = "symbol"><sub>ExB</sub> (dominated by the toroidal rotation contribution) are also comparably large when and where the ITB exists.



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