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Transition between internal transport barriers with different temperature-profile curvatures in JT-60U Tokamak
K Ida1, Y Sakamoto, H Takenaga
1National Institute for Fusion Sciences, Toki, Gifu, Japan.
Abstract:
A spontaneous transition phenomena between two states of a plasma with an internal transport barrier (ITB) is observed in the steady-state phase of the magnetic shear in the negative magnetic shear plasma in the JT-60U tokamak. These two ITB states are characterized by different profiles of the second radial derivative of the ion temperature inside the ITB region (one has a weak concave shape and the other has a strong convex shape) and by different degrees of sharpness of the interfaces between the L mode and the ITB region, which is determined by the turbulence penetration into the ITB region.
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