Rotation reversal bifurcation and energy confinement saturation in tokamak Ohmic L-mode plasmas |
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Authors: | Rice J E Cziegler I Diamond P H Duval B P Podpaly Y A Reinke M L Ennever P C Greenwald M J Hughes J W Ma Y Marmar E S Porkolab M Tsujii N Wolfe S M |
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Institution: | Plasma Science & Fusion Center (PSFC), Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. |
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Abstract: | 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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