Abstract
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.
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.
| Original language | English |
|---|---|
| Title of host publication | 45th EPS Conference on Plasma Physics, EPS 2018 |
| Editors | C. Michaut, J. Berndt, M. Mantsinen, S. Coda, G. Lapenta, S. Weber |
| Place of Publication | Mulhouse |
| Publisher | European Physical Society (EPS) |
| Pages | 1148-1151 |
| Number of pages | 4 |
| ISBN (Electronic) | 9781510868441 |
| Publication status | Published - 1 Jan 2018 |
| Event | 45th European Physical Society Conference on Plasma Physics (EPS 2018) - Prague, Czech Republic Duration: 2 Jul 2018 → 6 Jul 2018 https://eps2018.eli-beams.eu/en/ |
Conference
| Conference | 45th European Physical Society Conference on Plasma Physics (EPS 2018) |
|---|---|
| Abbreviated title | EPS 2018 |
| Country/Territory | Czech Republic |
| City | Prague |
| Period | 2/07/18 → 6/07/18 |
| Internet address |
Funding
Publications with an element of EUROfusionConsortium work have the acknowledgement: "This work has been carried out within the framework of the EUROfusionConsortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053 and from the RCUK Energy Programme [grant number EP/P012450/1]. To obtain further information on the data and models underlying this paper please contact [email protected]*. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Funding from the EPSRC Fusion CDT grant number EP/L01663X/1, is acknowledged.