Access to a New Plasma Edge State with High Density and Pressures using the Quiescent H Mode

作者：Solomon W M^*; Snyder P B; Burrell K H; Fenstermacher M E; Garofalo A M; Grierson B A; Loarte A; McKee G R; Nazikian R; O**orne T H

来源：Physical Review Letters, 2014, 113(13): 135001.

DOI：10.1103/PhysRevLett.113.135001

A path to a new high performance regime has been discovered in tokamaks that could improve the attractiveness of a fusion reactor. Experiments on DIII-D using a quiescent H-mode edge have navigated a valley of improved edge peeling-ballooning stability that opens up with strong plasma shaping at high density, leading to a doubling of the edge pressure over the standard H mode with edge localized modes at these parameters. The thermal energy confinement time increases as a result of both the increased pedestal height and improvements in the core transport and reduced low-k turbulence. Calculations of the pedestal height and width as a function of density using constraints imposed by peeling-ballooning and kinetic-ballooning theory are in quantitative agreement with the measurements.

• 出版日期2014-9-24