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• W975018559 abstract "Introduction: The High Density H-Mode (HDH) /1-3/, discovered and exploited over a wide range of conditions on the W7-AS stellarator, combines optimal core behavior along with edge parameters necessary for successful operation of an Island Divertor. Potentially this bodes well for the larger W7-X device (a/R = 0.16/2m vs. 0.5/5.5m) which represents the next step in the Wendelstein line of development. Still, the question remains if the HDH properties of high energy confinement with low impurity retention and radiation localized at the edge under steady-state conditions (ELM-free) at high densities (to 4 10 20 m -3 ) and heating powers (to 1.7MWm -3 ) can be realized on W7-X or other stellarators? Early investigations revealed that the differences in energy confinement between normal confinement- (NC) and HDH-modes were related to the much broader density profiles of HDH, in contrast to the peaked profiles of NC /1/. Further, the diminished residence time of laser-ablated aluminum in HDH compared to NC could be modeled in an ad hoc fashion by a smaller inwards impurity pinch in the core plasma /1, 4/. Neoclassical calculations indicated that temperature screening together with the flat n e -profiles could be the physical factors for this reduced pinch. However, the inwards convection associated with steep density gradients at the plasma edge for HDH would nonetheless still contrive to confine impurities within the core plasma. A postulation of enhanced impurity diffusion at the plasma edge was necessary in order to reproduce the impurity flushing features of HDH /5, 6/. It is of note that the Enhanced D H-mode (EDA) of the C-Mod tokamak has properties similar to HDH, e.g. flat n e -profiles and steady-state, ELM-free operation without impurity accumulation. A quasi-coherent (QC) mode at the plasma edge is thought to provoke impurity flushing /7-9/. In contrast, ELM-free H-modes without QC exhibit accumulation. This paper reports on dedicated experiments performed on W7-AS to compare HDH with standard ELM-free discharges (H*) ‐ which typically suffer radiation collapse as a result of impurity accumulation. A back-to-back comparison offers an excellent basis for pinpointing essential operative elements of HDH physics. Experiment: A discharge was tailored in an island-divertor configuration with P abs ~1.4MW whereby the density was ramped up until attainment of H*, and then after 60ms increased again until the HDH mode was solidly established (Fig.1). The entrance into H* is indicated by the cessation of ELM activity (seen in H of Figs. 1&2), followed by a rapid increase in" @default.
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• W975018559 date "2003-01-01" @default.
• W975018559 modified "2023-09-27" @default.
• W975018559 title "The Wendelstein W7-AS High Density H-Mode A Mode for the Future?" @default.
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