The Joint European Torus (JET) is getting ready for a new campaign with deuterium (D) fuel mixture at the Culham Centre for Fusion Energy (CCFE), UK. After this D campaign, a tritium (T) campaign is planned to follow. These campaigns are made in preparation for the eventual D-T campaign with a fusion reactor relevant 50%-50% D-T fuel mixture. It will be the second D-T campaign at JET; the first D-T campaign at JET was carried out in 1997. The production and physics of born alphas (He-4) at 3.5MeV due to D-T fusion reactions will be tested and assessed with the ITER-like-wall made of beryllium (Be) and tungsten (W).
As high-performance discharges are sought, the control of high-Z impurity transport will play a key role during this campaign. One of the main goals is to keep the impurity accumulation at the plasma core low. In this regard, large efforts have been carried out by the experimental and modelling team during the preparation of these campaigns.