Transition between internal transport barriers with different temperature-profile curvatures in JT-60U Tokamak plasmas |
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| Authors: | Ida K,Sakamoto Y,Takenaga H,Oyama N,Itoh K,Yoshinuma M,Inagaki S,Kobuchi T,Isayama A,Suzuki T,Fujita T,Matsunaga G,Koide Y,Yoshida M,Ide S,Kamada Y JT- team |
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| Affiliation: | National Institute for Fusion Sciences, Toki, Gifu, Japan. |
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| 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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