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Modeling analysis demonstrates a 15.5% bootstrap fraction in a spherical-tokamak breeder, indicating substantial dependence on external current drive.
Non-inductive current drive and bootstrap fraction of the compact spherical-tokamak breeder. At the frozen operating point the pressure-driven bootstrap current self-generates about 15.5 percent of the plasma current and external non-inductive drive supplies the rest, its wall-plug power booked openly in the recirculating budget. The bootstrap fraction is a lever, stated modestly. Physics only.
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Ford et al. (2026) studied this question.
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