Z-Dependence of Impurity Transport in the Hybrid Scenario at JET

Impurity transport is an important issue for the development of ITER scenarios. Indeed, impurity accumulation can lead to severe radiated power loss (from high Z impurities not fully ionised in the core), fuel dilution (for both low and high Z impurities) and can affect plasma stability. All of these issues need to be dealt with to achieve steady state operation. It is therefore important to gather knowledge on the Z-dependence of impurity transport in the ITER relevant scenarios. A new method to study the Z-dependence of impurity transport has been developed and is presented in this paper. This method allowed us to characterise impurity transport in the Hybrid scenario at JET.
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