Abstract
Transport analysis of a fully non-inductive high performance ASDEX Upgrade (AUG) hybrid mode discharge (Bock 2017 Nucl. Fusion 57 126041) is performed using a gyro-fluid transport code and a gyro-kinetic stability code. It is shown that the confluence of several mechanisms is essential for the improvement in core confinement. In addition to rotation shear, low magnetic shear, which is a common characteristic near the magnetic axis of a hybrid scenario, is found to be favorable for both electromagnetic and α stabilization. Together they facilitate the conditions for fast ions to establish a strong local internal transport barrier by providing additional dilution effect and enhancement of α stabilization. This study provides a complete picture and demonstrates that a quasilinear turbulent model is capable of quantitatively matching the experimental temperature profiles across the entire core of a hybrid mode discharge.
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