Friday, May 18, 2018
Quiescent H-modes (QH-modes) are a candidate regime for ITER and future reactors because they maintain a stationary pedestal without ELMs via additional edge transport generated by either an edge harmonic oscillation, broadband turbulence, a limit cycle oscillation, or some combination thereof. Over the past decade, the DIII-D tokamak has pioneered the development of the QH-mode regime by exploring access requirements such as critical edge ExB shearing rates and more recently, pushing towards ITER-relevant values of externally injected torque, shape, safety factor, and heating mix. This talk will focus on the differences between the standard QH-mode and one with a high and wide pedestal, which is often associated with enhanced confinement and unique edge pedestal turbulence characteristics, as well as the recent advances of the wide pedestal QH-mode towards ITER-like conditions.
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