Knowledge Management System of Hefei Institute of Physical Science，CAS
| 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
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| 2022 | |
| Source Publication | NUCLEAR FUSION
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| ISSN | 0029-5515 |
| Corresponding Author | Xu, X. Q.(xxu@llnl.gov) ; Li, G. Q.(ligq@ipp.ac.cn) |
| Abstract | The 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). |
| Keyword | grassy ELM ELM simulation heat flux width BOUT plus plus transient heat flux |
| DOI | 10.1088/1741-4326/ac3294 |
| WOS Keyword | H-MODE ; DIVERTOR ; ENERGY ; PARTICLE ; TRANSPORT ; ROTATION ; FLUX ; ELMS |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Shenzhen 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 Organization | Shenzhen Clean Energy Research Institute ; National Key R&D Program of China ; USDOE |
| WOS Research Area | Physics |
| WOS Subject | Physics, Fluids & Plasmas |
| WOS ID | WOS:000727008500001 |
| Publisher | IOP Publishing Ltd |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.hfcas.ac.cn:8080/handle/334002/126819 |
| Collection | 中国科学院合肥物质科学研究院 |
| Corresponding Author | Xu, X. Q.; Li, G. Q. |
| Affiliation | 1.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 Affilication | Chinese 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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