The influence of the photosheath on the very low energy electrons during active potential control

	The influence of the photosheath on the very low energy electrons during active potential control
	Zhoa, H.; Torkar, K.; Schmidt, R.; Riedler, W.; Escoubet, C. P.
	1998
会议名称	31st COSPAR Scientific Assembly on Active Experiments in Space Plasmas
会议日期	1998
会议地点	Birmingham, England
页码	745-748
英文摘要	A low and actively controlled electrostatic potential on the outer surface of a scientific spacecraft is very important for the accurate measurement of the cold plasma electrons and ions, A small potential barrier < 2 eV may emerge in the photoelectron sheath during the active potential control operation using energetic (some keV) ion beams. Although the measurement conditions are improved considerably, some very low energy electrons of the ambient plasma cannot overcome the potential barrier and return to the plasma. It is designated as the screen effect of the photosheath, In this paper, the relationship between the "hidden" low energy electron population and the parameters of the photosheath potential barrier, such as the height (< 2 eV) and position of the potential barrier, is analysed, The domains of the "hidden" and "detectable" ambient plasma electrons in the velocity space are presented.
收录类别	CPCI
会议录	Active experiments in space plasmas - 1996 proceedings of the d0.6 symposium of cospar scientific commission d
会议录出版者	Pergamon Press Ltd
会议录出版地	OXFORD
学科主题	空间物理
语种	英语
ISBN号	0273-1177;0-08-043458-4
内容类型	会议论文
源URL	[http://ir.cssar.ac.cn/handle/122/949]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Zhoa, H.,Torkar, K.,Schmidt, R.,et al. The influence of the photosheath on the very low energy electrons during active potential control[C]. 见:31st COSPAR Scientific Assembly on Active Experiments in Space Plasmas. Birmingham, England. 1998.