Tiber II as a precursor to an international thermonuclear experimental reactor

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The Tokamak Ignition/Burn Experimental Reactor (TIBER) [1] was pursued in the U.S. as one option for an International Thermonuclear Experimental Reactor (ITER). This concept evolved from earlier work on the Tokamak Fusion Core Experiment (TFCX) to develop a small, ignited tokamak [2]. While the coppercoil versions of TFCX became the short-pulsed, 1.23-m radius, Compact Ignition Tokamak (CIT) [3], the superconducting TIBER [4] with long pulse or steady state and a 2.6-m radius was considered for international collaboration. Recently the design was updated to TIBER II to accommodate more conservative confinement scaling, double-poloidal divertors for impurity control, steady-state current drive, and nuclear testing.