Alpha particle driven Alfvénic instabilities in ITER post-disruption plasmas
نویسندگان
چکیده
Fusion-born alpha particles in ITER disruption simulations are investigated as a possible drive of Alfv\'enic instabilities. The ability these waves to expel runaway electron (RE) seed is explored the pursuit passive, inherent RE mitigation scenario. spatiotemporal evolution particle distribution during calculated using linearized Fokker-Planck solver CODION coupled fluid simulation. These done limit no transport thermal quench, which can be seen most pessimistic situation where there also transport. Under assumptions, radial anisotropy resulting population provides free energy modes quench phase disruption. We use linear gyrokinetic magnetohydrodynamic code LIGKA calculate Alfv\'en spectrum and find that equilibrium capable sustaining wide range modes. self-consistent mode amplitudes utilizing wave-particle interaction tool HAGIS. Intermediate number ($n=7-15,~22-26$) Toroidal Eigenmodes (TAEs) shown saturate at an amplitude up $\delta B /B \approx 0.1$\% spatial regimes crucial for formation. predicted sufficiently large permit possibility significant electrons.
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ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 2021
ISSN: ['0029-5515', '1741-4326']
DOI: https://doi.org/10.1088/1741-4326/ac054c