1999•Plasma Physics and Controlled FusionRequires access

Collisionality dependence of the neoclassical tearing mode in ASDEX Upgrade

M. Maraschek, S. Günter, H. Zohm, the ASDEX Upgrade Team

Abstract

At ASDEX Upgrade the role of the collisionality for the excitation of neoclassical tearing modes has been investigated. In addition to the (3/2)-mode, which is always observed limiting the maximum at high enough -values, the excitation of a neoclassical (2/1)-mode at very low collisionalities has been observed. Schemes for discharges at ASDEX Upgrade with high -values at high heating power are presented.

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Available abstract

Key concepts: Collisionality, ASDEX Upgrade, Tearing, Excitation, Mode (computer interface), Limiting, Physics, Upgrade