Dust particle surface potential in fusion plasma with supra-thermal electrons

doi:10.1063/5.0091856

	Dust particle surface potential in fusion plasma with supra-thermal electrons
	Long, J. M.1,2; Ou, Jing 1
刊名	PHYSICS OF PLASMAS
	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).
资助项目	National Key R&D Program of China ; National Natural Science Foundation of China ; [2017YFE0300404] ; [11775257]
WOS关键词	GRAINS ; FORCE
WOS研究方向	Physics
语种	英语
出版者	AIP Publishing
WOS记录号	WOS:000850694900001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
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.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, 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).