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- W2006281880 abstract "Since ITER will operate close to threshold and with limited control, the H → L back transition is a topic important for machine operations as well as physics. Using a reduced mesoscale model [Miki et al., Phys. Plasmas 19, 092306 (2012)], we investigate ELM-free H → L back transition dynamics in order to isolate transport physics effects. Model studies indicate that turbulence spreading is the key process which triggers the back transition. The transition involves a feedback loop linking turbulence and profiles. The I-phase appears during the back transition following a slow power ramp down, while fast ramp-downs reveal a single burst of zonal flow during the back transition. The I-phase nucleates at the pedestal shoulder, as this is the site of the residual turbulence in H-mode. Hysteresis in the profile gradient scale length is characterized by the Nusselt number, where Nu=χi,turb/χi,neo. Relative hysteresis of temperature gradient vs density gradient is sensitive to the pedestal Prandtl number, where Prped=Dped/χi,neo. We expect the H-mode to be somewhat more resilient in density than in temperature." @default.
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- W2006281880 date "2013-06-01" @default.
- W2006281880 modified "2023-09-25" @default.
- W2006281880 title "Spatio-temporal evolution of the H → L back transition" @default.
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- W2006281880 doi "https://doi.org/10.1063/1.4812555" @default.
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