Dimensionless Identity Experiments in JT-60U and JET

TL;DRAbstract

This paper summarises results of dimensionless identity experiments in JT-60U and JET, aimed at the comparison of the H-mode pedestal and ELM behaviour in the two devices. Given their similar size, dimensionless matched plasmas are also similar in their dimensional parameters (in particular a is the same in JET and JT-60U). Power and density scans were carried out at two values of Ip, providing a q scan (q95=3.1 and 5.1) with fixed (and matched) field. Contrary to expectations, a dimensionless match between the two devices was quite difficult to achieve. pped in JT-60U is lower than in JET and, at low q, the pedestal pressure of JT-60U with a Type I ELMy edge is matched in JET only in the Type III ELM regime. At q95=5.1, a dimensionless match in ρ*, ν* and βp,ped is obtained with Type I ELMs, but only with low-power JET H-modes. These results motivated a closer investigation of experimental conditions in the two devices, to identify possible “hidden” physics that prevents obtaining a g

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