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Dependence of the low to high confinement mode transition power threshold and turbulence flow shear on injected torque
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View: Figures


Image of FIG. 1.
FIG. 1.

Time history of (a) edge recycling intensity (measured with a sightline passing near the divertor -point), (b) injected torque, (c) beam injected power, (d) toroidal rotation velocities near , and (e) the density fluctuation amplitudes measured with BES at over frequency ranges of 10–200 kHz in L mode and 75–300 kHz in H mode for away from the -point, coinjection discharge, and over 10–200 kHz for the balanced-injection discharge; L-H transitions are indicated by dashed vertical lines.

Image of FIG. 2.
FIG. 2.

Dependence of L-H power threshold on injected torque for plasma configurations with toward and away from the -point. Uncertainty bars show power threshold range since discrete power steps were employed.

Image of FIG. 3.
FIG. 3.

Density fluctuation cross power spectra (a) and cross phase (b) for two poloidally adjacent channels (, ) in the L mode phase of plasmas with away from the -point; solid line balanced injection, dashed line coinjection.

Image of FIG. 4.
FIG. 4.

Radial profiles of poloidal turbulence velocities and comparison to velocities for plasmas with away from the -point: (a) coinjection, (b) balanced-injection high frequency mode , and (c) balanced-injection low-frequency mode . Times chosen are representative of behavior in steady L mode (dashed) and behavior near the LH transition (solid) (integration time, ), and comparison to velocity near the transition (dash-dot).

Image of FIG. 5.
FIG. 5.

Radial profiles comparing the local turbulence decorrelation rate to the inferred radial shear rate approximately 600 and 100 ms prior to the L-H transition, for coinjection, away from the -point configurations.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dependence of the low to high confinement mode transition power threshold and turbulence flow shear on injected torque