Achieving a robust grassy-ELM operation regime in CFETR
文献类型：期刊论文
| 作者 | Zhu, Yi-Ren1; Li, Ze-Yu2,7,8; Chan, V. S.3,7; Chen, Jia-Le4 ; Jian, Xiang1; Dudson, B. D.5; Garofalo, A. M.7; Snyder, P. B.7; Xu, Xue-Qiao6; Zhuang, G.3
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| 刊名 | NUCLEAR FUSION
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| 出版日期 | 2020-04-01 |
| 卷号 | 60 |
| 关键词 | grassy-ELMs collisionality high beta(p) peeling-ballooning mode CFETR experimental comparison |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ab72c0 |
| 通讯作者 | Chan, V. S.(chanvs@ustc.edu.cn) ; Zhuang, G.(gezhuang@ustc.edu.cn) |
| 英文摘要 | We have identified a robust grassy-edge localized mode (ELM) operation regime for future tokamak reactors. The regime exists within a pedestal top electron collisionality (nu*) window at high global poloidal beta (beta(p)). The existence of an upper nu* limit for grassy-ELMs is consistent with results previously reported in experiments (Oyama et al 2010 Nucl. Fusion 50 064014), while the existence of a lower nu* limit has not been reported previously. Using EPED and BOUT + +, a theoretical model that quantitatively explains the physics of the grassy-ELMs within the window, which distinguishes them from the small mixed-ELMs at lower nu*, is presented for the first time. A peeling-ballooning stability boundary is obtained by scanning the operating density space. The change in density corresponds to a change in nu* that affects the pedestal bootstrap current. High beta(p) leads to a strong Shafranov shift, which affects the flux surface averaged pressure drive. The two effects combine to create a peeling-dominated window in intermediate nu* buffered by ballooning-dominated regimes. Only the peeling-dominated regime shows a cyclic behavior in the perturbed pressure during the nonlinear simulation of an ELM crash, reminiscent of grassy-ELM dynamics. Similarly, the energy released across the separatrix is demonstrated to be significantly smaller. The quick recovery of the ELM crash is explainable by the rapid rise of a low n kink-peeling instability when the pedestal current I-ped exceeds a threshold at high beta(p). It minimizes the excursion beyond marginal stability and is absent in the ballooning-dominated regime. Comparison with recent experiments over a range of beta(p) and nu* strongly supports the physical picture proposed by the modeling. |
| WOS关键词 | EDGE-LOCALIZED MODES ; H-MODES ; STABILITY ; PEDESTAL ; ENERGY |
| 资助项目 | National Magnetic Confinement Fusion Program of China[2017YFE0300500] ; National Magnetic Confinement Fusion Program of China[2017YFE0300501] ; National Magnetic Confinement Fusion Program of China[2015GB111001] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000519027500001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | National Magnetic Confinement Fusion Program of China |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/103743]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Chan, V. S.; Zhuang, G. |
| 作者单位 | 1.Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Peoples R China 2.Peking Univ, Fus Simulat Ctr, Beijing 100871, Peoples R China 3.Univ Sci & Technol China, Sch Phys Sci, Dept Engn & Appl Phys, Hefei 230026, Anhui, Peoples R China 4.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 5.Univ York, York Plasma Inst, York YO10 5DD, N Yorkshire, England 6.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA 7.Gen Atom, San Diego, CA 92186 USA 8.Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Yi-Ren,Li, Ze-Yu,Chan, V. S.,et al. Achieving a robust grassy-ELM operation regime in CFETR[J]. NUCLEAR FUSION,2020,60. |
| APA | Zhu, Yi-Ren.,Li, Ze-Yu.,Chan, V. S..,Chen, Jia-Le.,Jian, Xiang.,...&Zhuang, G..(2020).Achieving a robust grassy-ELM operation regime in CFETR.NUCLEAR FUSION,60. |
| MLA | Zhu, Yi-Ren,et al."Achieving a robust grassy-ELM operation regime in CFETR".NUCLEAR FUSION 60(2020). |
入库方式： OAI收割
来源：合肥物质科学研究院
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