Innovative Design Option for Internal Coils

For shaping and control of tokamak plasmas it is desirable to have poloidal field coils as close as possible to the plasma. This implies poloidal field coils internal to the toroidal field system. Internal poloidal field coils made of single turn sections are proposed. Interconnects between the different sectors, based on liquid metal contacts, are discussed. The possibility of driving the current in the poloidal field coils by efficient MHD-induced currents (flows of conducting liquid metals across magnetic fields) is explored.