Phys. Rev. Lett. 101, 055003 (2008) [4 pages]Transition between Internal Transport Barriers with Different Temperature-Profile Curvatures in JT-60U Tokamak PlasmasReceived 20 June 2007; revised 1 March 2008; published 31 July 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.055003
DOI:
10.1103/PhysRevLett.101.055003
PACS:
52.55.Fa, 52.25.Fi, 52.50.Gj
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