Extinguishment of hot cathode discharges by space-charge and surface magnetic effects

doi:10.1088/1361-6595/abbdc9

HFCAS OpenIR

	Extinguishment of hot cathode discharges by space-charge and surface magnetic effects
	Yip, Chi-Shung 1; Jin, Chenyao 1,2; Zhang, Wei1 ; Xu, Guo Sheng 1; Hershkowitz, Noah 3; Severn, Greg 4
	2020-11-01
发表期刊	PLASMA SOURCES SCIENCE & TECHNOLOGY
ISSN	0963-0252
通讯作者	Zhang, Wei(zhangwei@ipp.ac.cn)
摘要	Emission characteristics of a directly heated, rod-shaped LaB6 hot cathode has been studied in a multi-dipole confinement device. It is found that contrary to predictions from the conventional space-charge limited emission theory, emission current is not simply limited to a maximum value but eventually extinguished by space-charge related effects. In addition, directional preference of electron emission towards the positive lead of the applied heating voltage can be visibly observed. Results suggest that thermionically emitted electrons trapped in the virtual cathode are pumped towards the high voltage lead of the applied heating, and that the magnetic effects for filament heating currents exceeding 50 A may be the underlying mechanism of extinguishment; that is, the gyromotion of surface emitted electrons for sufficiently great heating currents may prevent electrons from escaping the virtual cathode. Geometrical effects are also briefly discussed.
关键词	thermionic emission virtual cathode sheaths hot cathode
DOI	10.1088/1361-6595/abbdc9
关键词[WOS]	EMISSION
收录类别	SCI
语种	英语
资助项目	CAS Key Research Program of Frontier Sciences[QYZDB-SSW-SLH001] ; National Natural Science Foundation of China[11575248] ; National Natural Science Foundation of China[11505220] ; US National Science Foundation[PHY-1804654] ; US National Science Foundation[PHY-1804240] ; Chinese Academy of Science Hundred Youth Talent Program start-up funding
项目资助者	CAS Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; US National Science Foundation ; Chinese Academy of Science Hundred Youth Talent Program start-up funding
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	WOS:000595243400001
出版者	IOP PUBLISHING LTD
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/105488
专题	中国科学院合肥物质科学研究院
通讯作者	Zhang, Wei
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China 3.Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA 4.Univ San Diego, Dept Phys & Biophys, San Diego, CA 92110 USA
第一作者单位	中科院等离子体物理研究所
通讯作者单位	中科院等离子体物理研究所
推荐引用方式 GB/T 7714	Yip, Chi-Shung,Jin, Chenyao,Zhang, Wei,et al. Extinguishment of hot cathode discharges by space-charge and surface magnetic effects[J]. PLASMA SOURCES SCIENCE & TECHNOLOGY,2020,29.
APA	Yip, Chi-Shung,Jin, Chenyao,Zhang, Wei,Xu, Guo Sheng,Hershkowitz, Noah,&Severn, Greg.(2020).Extinguishment of hot cathode discharges by space-charge and surface magnetic effects.PLASMA SOURCES SCIENCE & TECHNOLOGY,29.
MLA	Yip, Chi-Shung,et al."Extinguishment of hot cathode discharges by space-charge and surface magnetic effects".PLASMA SOURCES SCIENCE & TECHNOLOGY 29(2020).