Physics design point of high-field stellarator reactors

Abstract The ongoing development of electromagnets based on high temperature superconductors has led to the conceptual exploration high-magnetic-field fusion reactors tokamak type, operating at on-axis fields above 10 T. In this work we explore consequences potential future availability high-field three-dimensional physics design point a stellarator reactor. We find that, when an increase in magnetic field strength B is used maximally reduce device linear size R ? ?4/3 (with otherwise fixed geometry), largely independent chosen strength/device size. A similar degree optimization be imposed magnetohydrodynamic, transport and fast ion confinement properties configuration that family reactor points. Additionally, show shares invariant operation map power output as function auxiliary relative density variation. effects over-engineering ( ) scaling points with constant neutron wall loading are also inspected. study use geometric parameters characteristic helical axis advanced reactor, but most results apply other configurations.