Anisotropy and flow in fast-particle dominated and burning tokamak plasmas: stability of ITER and the coming demonstration fusion power plant

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This project will identify how beam injected and fusion born alphas affect the magnetic ?eld and excite wave modes in spherical tokamaks, where these particles have the most impact. Understanding these effects is critical to long pulse operation of high performance tokamaks with burning plasmas. In the UK spherical tokamak MAST for instance, fast ion driven bursty “chirping modes” and “?shbone” modes evolve into "long-lived" modes damaging plasma performance. This project will resolve the physics of the seed fast ion driven mode, its linear threshold and fully nonlinear evolution. Wider outcomes include scoping the impact of beams and alphas in next step burning plasma experiments, such as a nuclear facility for materials development, ITER, and a fusion power plant.