Modeling very high electron heating by radio frequency waves on EAST
文献类型：期刊论文
| 作者 | Huang, Yueheng2,3; Xiang, Nong4 ; Chen, Jiale4; Ma, Longhao1,4; Li, Erzhong4; Gong, Xianzu4; Xu, Liqing4; Qian, Jinping4; Liu, Haiqing4; Chu, Yuqi4
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| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2021-09-01 |
| 卷号 | 61 |
| ISSN号 | 0029-5515 |
| 关键词 | EAST integrated modeling LHW ECW high electron heating |
| DOI | 10.1088/1741-4326/ac1199 |
| 通讯作者 | Xiang, Nong(xiangn@ipp.ac.cn) ; Chen, Jiale(chen@ipp.ac.cn) |
| 英文摘要 | In the 2018 EAST experimental campaign, a very high central electron heating, fully-non-inductive discharge with the core electron temperature over 9 keV has been achieved. Such high central electron heating was realized by injecting radio frequency waves, including 1.8 MW lower hybrid wave (LHW) and 0.8 MW electron-cyclotron waves (ECW). Experimental diagnosis indicates two different time scales characterizing the electron heating process, a rapid and a slow rise of the central electron temperature after the injection of ECW. In this work, integrated modeling is performed to investigate the physical mechanisms of such high electron heating. Five characteristic phases during the increase of the electron temperature are chosen for modeling. In phase 1, the electron heating is by LHW alone. The modeling confirms that the LHW can only sustain the core electron temperature T (e) approximate to 5.5 keV, which is consistent with the experiment. In phase 2, the electron temperature increases rapidly after the first 0.4 MW ECW is injected. The result shows that the rapid increase of the electron temperature is due to the interaction between the ECW and the electrons. With the increase of the electron temperature, the electron flux induced by the trapped electron modes (TEMs) and the electron temperature gradient driven modes (ETGs) is enhanced in the core region. In phase 3, the electron temperature increases slowly after phase 2. It is found that the slow increase is mainly due to the flattening of the density profile. The flattening of the density profile can decrease the thermal diffusivity of the electrons mainly induced by the TEMs leading to a higher electron temperature for a given heating source. In phase 4, the electron temperature again increases rapidly after the second 0.4 MW ECW is injected. The physical mechanism is similar to that in phase 2. In phase 5, the LHW power deposition of the LHW remains almost unchanged compared to that in phase 4 since the electron temperature is sufficiently high. The slow rise of the electron temperature is caused by the improvement of the electron energy confinement as thermal diffusivity of the electrons is decreased due to the flattening of the electron density profile, which is similar to the main reason in phase 3. |
| WOS关键词 | CURRENT-DRIVEN PLASMA ; CYCLOTRON ; SUSTAINMENT ; EFFICIENCY |
| 资助项目 | National Key R&D Program of China[2017YFE0300400] ; National Key R&D Program of China[2017YFE0300404] ; National Natural Science Foundation of China[11805133] ; National Natural Science Foundation of China[11975272] ; National Natural Science Foundation of China[11905146] ; National Magnetic Confinement Fusion Science Program of China[2013GB111002] ; National Magnetic Confinement Fusion Science Program of China[2013GB112010] ; National Magnetic Confinement Fusion Science Program of China[2015GB101003] ; Shenzhen Clean Energy Research Institute |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000684702100001 |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China ; National Magnetic Confinement Fusion Science Program of China ; Shenzhen Clean Energy Research Institute |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/124416]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Xiang, Nong; Chen, Jiale |
| 作者单位 | 1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China 3.Shenzhen Univ, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Coll Optoelect Engn, Shenzhen 518060, Peoples R China 4.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Yueheng,Xiang, Nong,Chen, Jiale,et al. Modeling very high electron heating by radio frequency waves on EAST[J]. NUCLEAR FUSION,2021,61. |
| APA | Huang, Yueheng.,Xiang, Nong.,Chen, Jiale.,Ma, Longhao.,Li, Erzhong.,...&Qu, Junle.(2021).Modeling very high electron heating by radio frequency waves on EAST.NUCLEAR FUSION,61. |
| MLA | Huang, Yueheng,et al."Modeling very high electron heating by radio frequency waves on EAST".NUCLEAR FUSION 61(2021). |
入库方式： OAI收割
来源：合肥物质科学研究院
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