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Observations of fast ion loss to the plasma facing wall during quiescent H-modes on DIII-D
Authors
KH Burrell
FE Cecil
+5 more
JS Degrassie
W Heidbrink
CJ Lasnier
JG Watkins
WP West
Publication date
1 March 2005
Publisher
eScholarship, University of California
Abstract
The Quiescent H-mode exhibits H-mode levels of confinement and edge pedestal pressures, but does not exhibit ELMs. To date this mode has only been observed in tokamaks during beam heating with some or all of the beams injected counter to the direction of plasma current. During QH-mode, fast ion loss to the low field side plasma facing surfaces has been observed. Some of the fast ion loss is calculated to be the result of outwardly directed banana orbits of the energetic beam ions created in the edge region. Other fast ion loss has been observed to be associated with bursts or oscillations in broadband, high-frequency, magnetic fluctuations. The relationship of the fast ion loss to the ELM stabilization or edge particle transport during QH-mode is not yet understood. © 2004 Elsevier B.V. All rights reserved
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Last time updated on 25/12/2021