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Author: Friis, Zachary Ward × Author: Leonard, Anthony W. × Has files: Yes ×

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Analysis of neutral particle recycling and pedestal fueling in a H-mode DIII-D discharge

2010-02-23 , Friis, Zachary Ward , Stacey, Weston M. , Leonard, Anthony W. , Rensink, M. E.

A detailed analysis of neutral atom recycling and pedestal fueling in a DIII-D _J. Luxon, Nucl. Fusion 42, 614 _2002__ high-confinement mode discharge is presented. Experimental data and two-dimensional _2D_ edge plasma fluid code calculations are employed to provide ion wall recycling and recombination neutral sources and background edge plasma parameters for a 2D edge neutral code calculation of detailed neutral density, ionization, and charge-exchange distributions throughout the edge pedestal, scrape-off layer and surrounding halo region, divertor, and private flux regions. The effectiveness of the different neutral sources for fueling the confined plasma is evaluated

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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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