Title:
Investigation of the cause of the High-to-Low mode confinement transition following MARFE formation in DIII-D (DoE Grant ER54538)
Investigation of the cause of the High-to-Low mode confinement transition following MARFE formation in DIII-D (DoE Grant ER54538)
Author(s)
Stacey, Weston M.
Friis, Zachary Ward
Petrie, Thomas W.
Leonard, Anthony W.
Friis, Zachary Ward
Petrie, Thomas W.
Leonard, Anthony W.
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Abstract
The common observation that the onset of a core MARFE (Multifaceted Asymmetric Radiation From Edge) is followed immediately by a H-L (High-to-Low) confinement mode transition in DIII-D [J.
Luxon, Nucl. Fusion, 42, 614 (2002)] was investigated by comparing a theoretical prediction of the threshold non-radiative power across the separatrix needed to maintain H-mode with an experimental
determination of the non-radiative power flowing across the separatrix. It was found that in three shots
with continuous gas fueling the increased neutral influx associated with the MARFE formation caused a
sharp increase in the predicted threshold non-radiative power crossing the separatrix that was required for
the plasma to remain in H-mode to a value comparable to the experimental power crossing the separatrix.
Sponsor
DoE Grant ER54538
Date Issued
2005-10
Extent
298814 bytes
Resource Type
Text
Resource Subtype
Post-print