Speaker
Siobhan Faye Smith
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.1061.pdf
Numerical Simulations of Edge Localised Modes in MAST-U Plasmas
S.F. Smith1,2, S.J.P. Pamela1, H.R. Wilson1,2, G.T.A. Huijsmans3,4 and MST1 Team*
1 CCFE, Culham Science Centre, Abingdon, Oxon, UK.
2 York Plasma Institute, Department of Physics, University of York, York, UK.
3 CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
4 Eindhoven University of Technology, Eindhoven, The Netherlands.
Edge localised modes (ELMs) are magneto-hydrodynamic (MHD) instabilities that drive
filamentary plasma eruptions in high confinement tokamak discharges [1]. Gaining an
improved understanding of ELMs is important [2]; in future fusion reactors such as ITER,
ELM heat fluxes will need to be limited to ensure durability of divertor materials [3]. A new
divertor configuration, the Super-X, will be tested on the MAST-U tokamak. The Super-X has
a closed divertor designed to retain neutrals and could offer a solution for divertor heat flux
control due to the increased connection length and magnetic flux expansion [4]. The effect of
the new magnetic configuration on ELMs is unknown. First
simulations of ELM dynamics in MAST-U plasmas are
presented using the nonlinear MHD code JOREK [5], which is
being developed to establish quantitative validation against
current experiments [6]. The evolution of a model MAST-U
plasma has been simulated, showing filamentary structures of
higher density forming in the nonlinear phase. The simulations
predict energy and particle losses that are compared with data
from previous MAST experiments. A fluid neutrals model has
been implemented in JOREK and will be presented, including
the impact on ELM dynamics in MAST-U, considering
configurations with varying divertor leg length.
References:
[1] A. W. Leonard Phys. Plasmas 21, 090501 (2014)
[2] P. B. Snyder et al., Physics of Plasmas 12, 056115, (2005)
[3] R.A. Pitts et al., Journal of Nuclear Materials 438, S48-S56, (2013)
[4] I. Katramados et al. Fusion Eng. Des. 86 (2011) 1595–1598
[5] G T A Huysmans and O. Czarny, Nucl. Fusion 47 (2007) 659–666 Fig: Poloidal plane during the
simulation showing high density
[6] S.J.P. Pamela et al., Nucl. Fusion 57 076006 (2017) filaments forming in the plasma
* Author list H.Meyer et al, Nucl. Fusion 57 102014 (2017) edge.
