Simulation of triggering and evolution of ELM by pellet injection in EAST under BOUT plus plus framework
文献类型：期刊论文
| 作者 | Li, Mao2; Xia, Tianyang1 ; Sun, Zhen3; Chang, Huayi2; Sun, Jizhong2
|
| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2024-08-01 |
| 卷号 | 64 |
| 关键词 | pellet injection ELM triggering EAST BOUT plus plus |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ad54d8 |
| 通讯作者 | Sun, Jizhong(jsun@dlut.edu.cn) |
| 英文摘要 | A BOUT ++ three-field magnetohydrodynamic model is employed to study the triggering and evolution of edge localized mode (ELM) by Li pellets injected along the outer mid-plane in the EAST configuration. The linear simulation shows that compared with a large deposition on the pedestal top (scenario I), a smaller deposition within the steep-gradient pedestal region (scenario II) can stimulate much larger linear growth rates of all-n peeling-ballooning modes (PBMs). The nonlinear simulation shows that there exists a pellet size threshold for ELM triggering for two deposition locations; the threshold for scenario I predicted in the present study matches the EAST observation well. Comparison of the two scenarios reveals that a smaller deposition is sufficient to trigger an ELM in a much shorter time in scenario II, whose ELM size is comparable to that in scenario I. This conclusion confirms previous DIII-D and ASDEX-Upgrade observations, suggesting that the steep-gradient pedestal region is a favorable deposition location for ELM triggering with minimum pellet size. Simulation analyses also find that the positive radial gradient of the hump-like pressure profile in the outer mid-plane induced by the pellet deposition plays a different role in the two scenarios. In scenario I, the force resulting from the gradient hinders the outflow of core plasmas and in return, the perturbation is suppressed from spreading inwards after ELM crashes. In scenario II, with a sizable deposition, the gradient results in another competitive perturbation growth region during the linear phase, thus dispersing the free energy and reducing the efficiency of destabilizing PBMs by pellet injection. The suppressing effect of saturated zonal flow on other modes, the short ELM fast crash phase, and the restricting transport effect of the positive radial pressure gradient work together to constrain the pedestal energy loss, especially when the pellet deposition amount is high. |
| WOS关键词 | H-MODE PEDESTAL ; MITIGATION ; ITER |
| 资助项目 | National Key R&D Program of China[2019YFE03030004] ; National Natural Science Foundation of China[12275040] ; Users with Excellence Program of Hefei Science Center CAS[2020HSC-UE010] ; US DOE[DE-AC02-09CH11466] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001268969800001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China ; Users with Excellence Program of Hefei Science Center CAS ; US DOE |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/137134]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Sun, Jizhong |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Sch Phys, Minist Educ, Dalian 116024, Peoples R China 3.Princeton Plasma Phys Lab, Princeton, NJ 08543 USA |
| 推荐引用方式 GB/T 7714 | Li, Mao,Xia, Tianyang,Sun, Zhen,et al. Simulation of triggering and evolution of ELM by pellet injection in EAST under BOUT plus plus framework[J]. NUCLEAR FUSION,2024,64. |
| APA | Li, Mao,Xia, Tianyang,Sun, Zhen,Chang, Huayi,&Sun, Jizhong.(2024).Simulation of triggering and evolution of ELM by pellet injection in EAST under BOUT plus plus framework.NUCLEAR FUSION,64. |
| MLA | Li, Mao,et al."Simulation of triggering and evolution of ELM by pellet injection in EAST under BOUT plus plus framework".NUCLEAR FUSION 64(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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