- Main
Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic L-Mode Plasmas
- Rice, JE;
- Cziegler, I;
- Diamond, PH;
- Duval, BP;
- Podpaly, YA;
- Reinke, ML;
- Ennever, PC;
- Greenwald, MJ;
- Hughes, JW;
- Ma, Y;
- Marmar, ES;
- Porkolab, M;
- Tsujii, N;
- Wolfe, SM
Published Web Location
https://doi.org/10.1103/physrevlett.107.265001Abstract
Direction reversals of intrinsic toroidal rotation have been observed in diverted Alcator C-Mod Ohmic L-mode plasmas following electron density ramps. For low density discharges, the core rotation is directed cocurrent, and reverses to countercurrent following an increase in the density above a certain threshold. Such reversals occur together with a decrease in density fluctuations with 2 cm(-1)≤k(θ)≤11 cm(-1) and frequencies above 70 kHz. There is a strong correlation between the reversal density and the density at which the Ohmic L-mode energy confinement changes from the linear to the saturated regime.
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