Optimising the use of ICRF waves in JET hybrid plasmas for high fusion yield

In the recent JET experimental campaign, good progress was made in the development of high-performance plasma scenarios compatible with the ITER-like wall (ILW). This paper reports on the optimisation of the use of ion cyclotron resonance frequency (ICRF) waves for the hybrid scenario in combination with neutral beam injection. The hybrid scenario is a candidate for ITER long-pulse operation. The combined NBI+ICRF power was increased to 33 MW and the record JET ILW fusion yield, averaged over 100 ms, from 2.3x1016 neutrons/s to 2.9x1016 neutrons/s with respect to the previous 2014 JET ILW fusion record. Impurity control with ICRF waves was one of the key means for extending the duration of …