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Particle simulation of bursting Alfv$'e$n modes in JT-60U

Briguglio, S.*; Fogaccia, G.*; Vlad, G.*; Zonca, F.*; Shinohara, Koji; Ishikawa, Masao; Takechi, Manabu

The results of particle-in-cell simulations of a negative neutral beam heated Alfv$'e$n-mode experiment in the JT-60U are presented. They seem to match quite well the dynamics of the abrupt large-amplitude event (ALE) experimentally observed in the reference JT-60U discharge. The time scale and frequency spread of the ALE are well reproduced too. The issue of the weaker Alfv$'e$n fluctuation phase following the ALEs, characterized by fast frequency sweeping modes, is also investigated and an interpretation of the full JT-60U bursting-mode phenomenology is presented. Finally, the simulation tool is exploited by ad hoc synthetic diagnostics on the fast ion distribution function to get a deeper insight into the ALE nonlinear dynamics. The underlying fast-growing energetic particle mode saturates as resonant energetic ions are scattered out of the resonance region and displaced outwards. The radially displaced ions resonate with outer Alfv$'e$n modes and enhance their local drive.

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Category:Physics, Fluids & Plasmas

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