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(EX3/5) Confinement Degradation of ELMy H-Modes at High Density and/or Radiated Power Fraction

G. F. Matthews and the JET Team (see Appendix to IAEA-CN-69/OV1/2)

JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom

Abstract.  High density, high radiated power fraction and small ELMs are key elements of the current ITER design. In JET, these conditions are shown to be associated with high ELM frequency, low pedestal pressure and correspondingly reduced global energy confinement time. This paper reviews our current understanding of the connections between these parameters.

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