Dimensionless pedestal identity experiments in JT-60U and JET in ELMy H-mode plasmas

Saibene, G.*; Hatae, Takaki; Campbell, D. J.*; Cordey, J. G.*; la Luna, E. de.*; Giroud, C.*; Guenther, K.*; Kamada, Yutaka; Kempenaars, M. A. H.*; Loarte, A.*; Lnnroth, J.*; Mc Donald, D.*; Nave, M. F. F.*; Oyama, Naoyuki; Parail, V.*; Sartori, R.*; Stober, J.*; Suzuki, Takahiro; Takechi, Manabu; Toi, Kazuo*

Towards establishment of the control scheme and evaluation of the H-mode pedestal structure and behavior of the Edge Localized Mode (ELM) in ITER, we carried out an comparison experiment among the two large tokamaks (JT-60 and JET) for the first time. This paper report the initial results. In both devices, the same plasma shape was adopted and the three non-dimensional parameters (beta, normalized gyro radius and the normalized collisionality) were set identical. The pedestal width was almost similar in the two devices, however the pressure gradient was higher in JET by a factor of 1.5. The possible reason is a small aspect ration in JET.