Edge-localized-mode simulation in CFETR steady-state scenario
Tang, T. F.1,2; Xu, X. Q.3; Li, G. Q.4; Chen, J. L.4; Chan, V. S.5,6; Xia, T. Y.4; Gao, X.1,2,4; Wang, D. Z.7; Li, J. G.1,2,4
Source PublicationNUCLEAR FUSION
Corresponding AuthorXu, X. Q.(xxu@llnl.gov) ; Li, G. Q.(ligq@ipp.ac.cn)
AbstractThe EPED1 model and self-consistent core-pedestal coupling in integrated modeling are used to design the pedestal structure of the China Fusion Engineering Testing Reactor (CFETR) steady-state scenario. The key parameters, such as beta (p) and q (95), are based on the grassy edge-localized-mode (ELM) experimental database. In this work, we use the BOUT++ six-field two-fluid code to simulate the onset of the ELM in the CFETR steady-state scenario. The ELM size is around 0.2% in nonlinear simulations, which is in the experimental range of the grassy ELM discharges, 0.1%-1% observed in multiple tokamak devices. Linear and nonlinear simulations show that the dominant high-n ballooning modes peak around n = 40. Compared to type-I ELM crashing dynamics, grassy ELM crashing has a smaller initial crash and is then followed by three phases of turbulence spreading, which are dominated by multi-modes, a high-n mode of n = 45 and low-n mode of n = 5, respectively. In contras to type-I ELM, the perturbation of the high-n mode has a narrow width around psi = 0.95, and magnetic island formation and reconnection occur only beyond psi = 0.95, leading to a small initial crash. Mode-mode interaction in the multi-mode coexistence stage stops the growth of individual modes and reduces the transport of particles and heat, and these are the two reasons why the ELM size is small. In-out asymmetry of transient heat flux with a ratio of E (out)/E (in) = 3.5 is found during grassy ELM crash. The rise and delay times of the heat flux match the calculation from the free-streaming model. To evaluate the erosion of the divertor target, the energy fluence at the outer divertor target is calculated, which is 0.029 MJ m(-2), 5.5 times smaller than the tungsten melting limit 0.16 MJ m(-2). The calculated energy fluency still follows the experimental scaling law from type-I ELM experiments. The fluctuation eddies in the toroidal direction show a filament structure at the outer mid-plane. Parallel heat flux patterns with a toroidal mode number n = 10 are found at the outer divertor with an amplitude of 680 MW m(-2).
Keywordgrassy ELM ELM simulation heat flux width BOUT plus plus transient heat flux
Indexed BySCI
Funding ProjectShenzhen Clean Energy Research Institute ; National Key R&D Program of China[2017YFE0301206] ; National Key R&D Program of China[2017YFE0300402] ; National Key R&D Program of China[2017YFE0301100] ; USDOE[DE-AC52-07NA27344] ; USDOE[LLNL-JRNL-823052]
Funding OrganizationShenzhen Clean Energy Research Institute ; National Key R&D Program of China ; USDOE
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS IDWOS:000727008500001
PublisherIOP Publishing Ltd
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Document Type期刊论文
Corresponding AuthorXu, X. Q.; Li, G. Q.
Affiliation1.Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China
2.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China
3.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
4.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
5.Univ Sci & Technol China, Dept Engn & Appl Phys, Sch Phys Sci, Hefei 230026, Peoples R China
6.Gen Atom, POB 85608, San Diego, CA 92186 USA
7.Dalian Univ Technol, Sch Phys, Dalian 116024, Peoples R China
Corresponding Author AffilicationChinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Tang, T. F.,Xu, X. Q.,Li, G. Q.,et al. Edge-localized-mode simulation in CFETR steady-state scenario[J]. NUCLEAR FUSION,2022,62.
APA Tang, T. F..,Xu, X. Q..,Li, G. Q..,Chen, J. L..,Chan, V. S..,...&Li, J. G..(2022).Edge-localized-mode simulation in CFETR steady-state scenario.NUCLEAR FUSION,62.
MLA Tang, T. F.,et al."Edge-localized-mode simulation in CFETR steady-state scenario".NUCLEAR FUSION 62(2022).
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