Dust particle surface potential in fusion plasma with supra-thermal electrons
文献类型：期刊论文
| 作者 | Long, J. M.1,2; Ou, Jing2
|
| 刊名 | PHYSICS OF PLASMAS
 |
| 出版日期 | 2022-09-01 |
| 卷号 | 29 |
| ISSN号 | 1070-664X |
| DOI | 10.1063/5.0091856 |
| 通讯作者 | Ou, Jing(ouj@ipp.ac.cn) |
| 英文摘要 | By solving the current balance equations, the effect of the supra-thermal electrons on the surface potential of a negatively charged dust particle in a fusion plasma is studied based on the orbital motion limited theory. A non-Maxwellian plasma is modeled by employing a q-non-extensive velocity distribution, where a decreased q-parameter (q < 1) yields increased population of supra-thermal electrons. It is found that with the decrease in the q-parameter, the surface potentials of tungsten and carbon dust particles become more negative. When the ion temperature or ion flow velocity is increased, the dust surface potential changes non-monotonically, which is first decreasing and then increasing. For a small q-parameter, the non-monotonic variation is more pronounced and the minimum value of surface potential moves toward higher values of the ion temperature or ion flow velocity. Due to the dependence of the dust particle surface potential on the supra-thermal electrons, the increased proportion of supra-thermal electrons causes the increase in the ion drag force and the decrease in the dust particle lifetime. Here, lifetime refers to the time taken for the dust surface temperature to increase from its initial value to the sublimation temperature (for carbon) or the melting temperature (for tungsten). The decrease in lifetime caused by supra-thermal electrons is significant as the dust particle radius is increased. (C) 2022 Author(s). |
| WOS关键词 | GRAINS ; FORCE |
| 资助项目 | National Key R&D Program of China ; National Natural Science Foundation of China ; [2017YFE0300404] ; [11775257] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000850694900001 |
| 出版者 | AIP Publishing |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/128832]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Ou, Jing |
| 作者单位 | 1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China |
| 推荐引用方式 GB/T 7714 | Long, J. M.,Ou, Jing. Dust particle surface potential in fusion plasma with supra-thermal electrons[J]. PHYSICS OF PLASMAS,2022,29. |
| APA | Long, J. M.,&Ou, Jing.(2022).Dust particle surface potential in fusion plasma with supra-thermal electrons.PHYSICS OF PLASMAS,29. |
| MLA | Long, J. M.,et al."Dust particle surface potential in fusion plasma with supra-thermal electrons".PHYSICS OF PLASMAS 29(2022). |
入库方式： OAI收割
来源：合肥物质科学研究院
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