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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.
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.
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.
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).
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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