Bundle divertor designs for the ILB Advanced Fuel Tokamaks

A divertor is generally considered to be a necessary part of a power-producing tokamak. The bundle divertor has been modeled in order to gauge the feasibility of using a bundle divertor to perform an unusual function: linking a tokamak to a direct collector. To that end, reference bundle divertor designs for five ILB Advanced Fuel Tokamaks (designed by the University of Illinois, Lawrence Livermore Laboratory, and Brookhaven National Laboratory) are presented. The expected gains in electrical conversion efficiency of these advanced fuel tokamaks with bundle divertor-direct collector systems are given. It appears that cryogenic aluminum bundle divertor coils are better suited for use with direct collectors than either Nb3Sn superconducting or warm copper normal-conducting coils