Fusion nuclear reactor

Spherical-type tokamak configured to operate with plasma in negative triangularity, comprising a chamber (100) for housing a plasma, said tokamak being configured so that, during operation, said plasma defines a profile having both in an upper region (UR) as well as in a lower region (LR) of said plasma, a radially internal plasma separator leg (L1) and a radially external plasma separator leg (L2);

• wherein:
• the chamber (100) comprises an upper region (100a) for receiving said upper plasma region (UR) and comprises a lower region (100b) for receiving said lower plasma region (LR),
• at least one of the upper region (100a) or the lower region (100b) of the chamber (100) are equipped with at least one divertor (300) configured to operate with plasma in negative triangularity, said at least one divertor (300) comprising a divertor plate (210, 220) and divertor field coils (D1a-D6a, D1b-D6b), wherein said divertor field coils (300) being configured to drive the radially inner and radially outer plasma separator legs (L1, L2) towards the respective divertor plate (210, 220);
• said at least one divertor (300) which is configured to operate with plasma in negative triangularity and which comprises an inlet which is located in an external support vessel (V) in a radially outermost position with respect to a point X (PXP) of a respective region (100a, 100b) in which, during operation, said radially inner plasma separator leg (L1) and said radially outer plasma separator leg (L2) are intended to intersect.