DOUBLE NULL LIQUID METAL DIVERTORS

A tokamak plasma vessel. The tokamak plasma vessel comprises a toroidal plasma chamber, a plurality of poloidal field coils, an upper divertor assembly, and a lower divertor assembly. The plurality of poloidal field coils are configured to provide a poloidal magnetic field having a substantially symmetric plasma core and an upper and lower null, such that ions in a scrape off layer outside the plasma core are directed by the magnetic field past one of the upper and lower nulls to divertor surfaces of the respective upper and lower divertor assembly. Each of the upper and lower divertor assembly comprises a radially inboard divertor surface formed from solid meal and positioned to receive ions from the scrape off layer which is radially inward of the plasma envelope, a radially outboard divertor surface positioned to receive ions from the scrape off layer which is radially outwards of the plasma envelope, a liquid metal inlet and a liquid metal outlet located below the liquid metal inlet. Each of the upper and lower divertor assembly is configured such that in use liquid metal flows from the liquid metal inlet to the liquid metal outlet over at least the respective radially inward divertor surface.