Speaker
Description
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1034.pdf
Recent experiments have shown that Edge Localized Modes (ELMs) can have a strong impact on the fast-ion population, causing significant losses and/or acceleration [1, 2]. These findings motivate a kinetic study of the interplay between fast-ions and ELMs. For this purpose, the 3D hybrid kinetic-MHD code MEGA [3] has been applied to a diagnosed ASDEX Upgrade case [4]. Large type I ELMs have been obtained using both the standard and extended MHD model in a fully 3D geometry, including the X-point and scrape-off layer (SOL) region. Standard MHD simulations reveal that high (n~30) ballooning modes dominate the linear phase. A saturated phase is obtained, in which lower n modes have grown due to non-linear couplings between different harmonics. These results are compared against extended MHD simulations, including ion diamagnetic drifts and neoclassical flows, the latter recently being implemented in MEGA. Preliminary results of the dependence of the mode stability on the NBI fast-ion distribution will be discussed.
[1] M. Garcia-Munoz et al., Nucl. Fusion 53 (2013), 123008.
[2] J. Galdon-Quiroga et al., Phys. Rev. Lett. 121 (2018), 025002.
[3] Y. Todo et al., Phys. Plasmas 5 (1998), 1321.
[4] A. F. Mink et al., Nucl. Fusion 58 (2018), 026011.
§ H. Meyer et al, Nucl. Fusion 57 (2017), 102014.
