Fast-ion transport in quasisymmetric equilibria in the presence of a resonant Alfvénic perturbation

Paul, Elizabeth J.; Mynick, Harry E.; Bhattacharjee, Amitava

doi:10.1017/S0022377823001095

Title: Fast-ion transport in quasisymmetric equilibria in the presence of a resonant Alfvénic perturbation

Journal Article · 19 October 2023 · Journal of Plasma Physics

DOI: https://doi.org/10.1017/S0022377823001095 · OSTI ID:2203161

; Mynick, Harry E.; Bhattacharjee, Amitava

Significant progress has been made in designing magnetic fields that provide excellent confinement of the guiding-centre trajectories of alpha particles using quasisymmetry (QS). Given the reduction in this transport channel, we assess the impact of resonant Alfvén eigenmodes (AEs) on the guiding-centre motion. The AE amplitudes are chosen to be consistent with experimental measurements and large-scale simulations. We evaluate the drift resonance condition, phase-space island width and island overlap criterion for quasisymmetric configurations. Kinetic Poincaré plots elucidate features of the transport, including stiff transport above a critical perturbation amplitude. Our analysis highlights key departures from the AE-driven transport in tokamaks, such as the avoidance of phase-space island overlap in quasihelical configurations and the enhanced transport due to wide phase-space islands in low magnetic shear configurations. In configurations that are closer to QS, with QS deviations $$\delta B/B_0 \lesssim 10^{-3}$$ , the transport is primarily driven by the AE, while configurations that are further from QS, $$\delta B/B_0 \sim 10^{-2}$$ , experience significant transport due to the QS-breaking fields in addition to the AE.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0016268

OSTI ID:: 2203161

Alternate ID(s):: OSTI ID: 2217306

Journal Information:: Journal of Plasma Physics, Journal Name: Journal of Plasma Physics Journal Issue: 5 Vol. 89; ISSN 0022-3778

Publisher:: Cambridge University Press (CUP)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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