Near-term tokamak reactor designs with high performance resistive magnets

A wide range of designs of near term tokamak reactors with high performance resistive magnets has been studied. High fields, obtainable in the near term only from resistive magnets, are used to provide high values of ntausub(E) and fusion power density, and to facilitate operation in the DD-DT advanced fuel mode. Magnet shielding requirements can be significantly reduced relative to those for superconducting magnets. Advanced Fusion Test Reactors (AFTR) designs have been developed using BITTER type magnets which are capable of steady state operation. The goals of compact AFTR designs (with major radii R approx.=2.5 - 4 m), include DT ignition with large physics margins; high duty cycle, long pulse operation; and DD-DT operation with low tritium concentration. Larger AFTR designs (R approx.=5m), have the additional goal of early demonstration of self sufficiency in tritium production. The AFTR devices could also serve as prototypes for commercial reactors. Compact ignition test reactors have also been designed (R approx.=1 - 2m). These designs use BITTER magnets that are inertially cooled starting at liquid nitrogen temperature. A detailed engineering design was developed for ZEPHYR. (author)