Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic L-Mode Plasmas
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(theta) <= 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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Rice, J., Cziegler, I., Diamond, P., Duval, B., Podpaly, Y., Reinke, M., Ennever, P., Greenwald, M., Hughes, J., Ma, Y., Marmar, E., Porkolab, M., Tsujii, N., & Wolfe, S. (2011). Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic L-Mode Plasmas. Physical Review Letters, 107(26), Article 265001. https://doi.org/10.1103/PhysRevLett.107.265001
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WOS:000298607400005
2011
107
26
265001
REVIEWED
EPFL