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Abstract

PEP mode in Tore Supra is found to involve three stabilizing mechanisms: density peaking, ExB shear, and a low magnetic shear. It has to be stressed that a strong negative shear is not as favourable. The curvature driven modes are stable but a slab ITG branch appears, with significant growth rates. The most stable region for drift modes corresponds to s=0.5. The low shear configuration is also favourable for the reason that it eliminates mostr of the resonant surfaces associated to low wavenumber modes, which impy a deep reduction of Dh. This analysis provides some keys to understand PEP modes in other devices, and clarifies in particular the respective importance of density peaking and magnetic shear in TFTR and JET.

Additional information

Authors: MAGET P, CEA (FR);GARBET X, CEA (FR);GERAUD A, CEA (FR);JOFFRIN E, CEA (FR)
Bibliographic Reference: Article: Controled Fusion and Plasma Physics, 1998
Record Number: 199910610 / Last updated on: 1999-04-01
Category: PUBLICATION
Original language: en
Available languages: en