Local physics basis of confinement degradation in JET ELMy H mode plasmas and implications for tokamak reactors

摘要

First results of gyrokinetic analysis of JET ELMy H mode plasmas are presented. ELMy H mode plasmas form the basis of conservative performance predictions for tokamak reactors of the size of AITER. Relatively high performance for long durations has been achieved and the scaling appears to be favourable. It will be necessary to sustain low Z_eff and high density for high fusion yield. The article studies the degradation in confinement and the increases In the anomalous heat transport observed in two JET plasmas: one with an intense gas puff and the other with a Spontaneous transition from type I to III ELMs at the heating power threshold.