Abstract
High density, gas fueled, high confinement mode, DIII-D [Luxon, Anderson, Batty et al., Plasma Physics and Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159] shots that were limited in density buildup by: (1) an H–L (high-to-low confinement mode) transition apparently triggered by a core X-point MARFE (multifaceted asymmetric radiation from edge), following the thermal instability sequence of detachment-divertor MARFE-core X-point MARFE; (2) a density limit apparently triggered by large scale core magnetohydrodynamic activity; and (3) an H–L transition apparently triggered by excessive radiated power from the plasma core are analyzed. The presence or absence of a MARFE was correctly predicted by thermal instability theory. A sharp edge temperature gradient was identified as an important factor inhibiting the usual detachment-MARFE sequence in DIII-D and thus leading to the achievement of higher density.
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