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Fusion Research Center Annual Report Series

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Author: Petrie, Thomas W. ×

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Investigation of the cause of the High-to-Low mode confinement transition following MARFE formation in DIII-D (DoE Grant ER54538)

2005-10 , Stacey, Weston M. , Friis, Zachary Ward , Petrie, Thomas W. , Leonard, Anthony W.

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.

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Analysis of DIII-D Experiments (DOE GRANT ER54538)

2003-12 , Stacey, Weston M. , Mandrekas, John , Groebner, Rich J. , Petrie, Thomas W. , Colchin, Richard J.

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