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A Simulation study on burning profile tailoring of steady state, high bootstrap current tokamaks

Nakamura, Yukiharu; Takei, Nahoko; Tobita, Kenji; Sakamoto, Yoshiteru; Fujita, Takaaki; Fukuyama, Atsushi*; Jardin, S. C.*

From the aspect of fusion burn control in steady state DEMO plant, the significant challenges are to maintain its high power burning state of $$sim$$ 3 - 5 GW without burning instability, and also to keep its desired burning profile relevant with internal transport barrier (ITB) that generates high bootstrap current. A self-consistent simulation has pointed out that in the high power fusion DEMO plant there is a close, nonlinear interplay between the fusion burnup and the current source of non-inductive, ITB-generated bootstrap current. Consequently, as much distinct from usual burning conditions with lower power ($$<$$$$<$$ 1GW), the self-ignited fusion burn at a high power burning state of $$sim$$ 3 - 5 GW becomes so strongly self-organized that any of external means except fuelling can not provide the effective control of the stable fusion burn. The paper presents a simulation modeling of the burning stability coupled with the self-ignited fusion burn and the structure-formation of the ITB.

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