Core transport properties in JT-60U and JET identity plasmas

Litaudon, X.*; Sakamoto, Yoshiteru; de Vries, P. C.*; Salmi, A.*; Tala, T.*; Angioni, C.*; Benkadda, S.*; Beurskens, M. N. A.*; Bourdelle, C.*; Brix, M.*; Cromb, K.*; Fujita, Takaaki; Futatani, S.*; Garbet, X.*; Giroud, C.*; Hawkes, N. C.*; Hayashi, Nobuhiko; Hoang, G. T.*; Hogeweij, G. M. D.*; Matsunaga, Go; Nakano, Tomohide; Oyama, Naoyuki; Parail, V.*; Shinohara, Koji; Suzuki, Takahiro; Takechi, Manabu; Takenaga, Hidenobu; Takizuka, Tomonori; Urano, Hajime; Voitsekhovitch, I.*; Yoshida, Maiko; ITPA Transport Group*; JT-60 Team; JET-EFDA Contributors*

A variety of triggering mechanisms and structures of internal transport barrier (ITB) has been observed in various devices or depending on operation scenarios. Thus identity experiments on ITB in JT-60U and JET have been performed to shed light on the physics behind ITBs. Because of their similar size, the dimensionless parameters between both devices are the same. These experiments were performed with near identical magnetic configurations, heating waveforms and normalized quantities such as safety factor, magnetic shear, normalized Larmor radius, normalized collision frequency, beta, temperatures ratio. Similarities of the ITB triggering mechanism and the ITB strength have been observed when a proper match is achieved of the most relevant profiles of the normalized quantities. This paper will report on the detail comparison of transport properties of ITBs obtained in these JET/JT-60U identity experiments.