3D Modelling of the Lithium Injection Experiment in H-Mode Plasma of EAST
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ORIGINAL RESEARCH
3D Modelling of the Lithium Injection Experiment in H-Mode Plasma of EAST B. Pan1 • S. Y. Dai1 • B. Liu1 • Z. Sun2,3 • D. Z. Wang1 Accepted: 7 September 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Investigations of lithium transport in H-mode plasma of EAST tokamak have been performed by the three-dimensional fluid code EMC3-EIRENE. The simulation results show that the toroidally-localized lithium injection at the low field side (LFS) leads to a toroidally non-axisymmetric distribution of the Li1? and Li2? ions. The field line tracing approach is utilized to carry out a detailed study on the distributions of the Li1? and Li2? ions. It is found that Li1? ions mainly reside at the LFS while Li2? ions can transport from LFS to the high field side. The relationship between mean free path and connection length for Li1? and Li2? ions has been discussed. The 3D line-integration images of deuterium and lithium emission spectra modelled by EMC3-EIRENE are in qualitative consistency with the experiment results. Keywords Impurity transport EMC3-EIRENE Lithium
Introduction Lithium (Li) is considered as one of most promising candidates for plasma facing materials (PFMs) of future fusion devices, which can be self-healing compared to solid materials [1, 2]. Experiments related to Li coating, Li powder injection and liquid Li limiter have been performed on tokamaks and stellarators, such as TFTR [3], TJ-II [4, 5], FTU [6, 7], CDX-U [8], EAST [9–12], NSTX [2, 13, 14] and NSTX–U [15]. Li impurity due to its low charge state has a weak hazardous impact in terms of bremsstrahlung compared to high-Z impurities. In addition, the deposited Li impurity can reduce impurity content in the background plasma by absorbing atomic or ionic species such as carbon and oxygen. Therefore, investigations
& S. Y. Dai [email protected] 1
Key Laboratory of Materials Modification By Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, People’s Republic of China
2
Princeton Plasma Physics Laboratory, 100 Stellarator Road, Princeton, NJ 08540, USA
3
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
of Li impurity transport in the edge plasma are crucial to achieve a long-term and steady-state operation regime for fusion facilities. The two-dimensional (2D) simulations of Li injection have been conduct by M3D-C1 [16] and SOLPS [17] to study the impacts of injected Li on background plasma. Further, 3D modelling of Li transport for liquid Li limiter in L-mode plasma on EAST tokamak has been carried out with the three-dimensional (3D) fluid code EMC3-EIRENE [18]. However, transport and emission properties of Li impurity in the H-mode plasma are not well understood yet. Hence, in this study, modelling of Li transport and emission features in the Li injection experiment has been conducted for the EAST H-mode plasma with EMC3EIR
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