ウエダ　ヨシオ   Ueda Yoshio   上田　良夫    所属   追手門学院大学  理工学部 電気電子工学科    職種   教授
言語種別	英語
発行・発表の年月	2007/10
形態種別	論文
査読	査読あり
標題	Spectroscopic determination of the singly ionized helium density in low electron temperature plasmas mixed with helium in a linear divertor plasma simulator
執筆形態	共著・編著（代表編著を除く）
掲載誌名	PHYSICS OF PLASMAS
掲載区分	国外
出版社・発行元	AMER INST PHYSICS
巻・号・頁	14(10)
国際共著	国際共著
著者・共著者	D. Nishijima,R. P. Doerner,M. J. Baldwin,E. M. Hollmann,R. P. Seraydarian,Y. Ueda
概要	The spectroscopic method is developed to obtain the He+ ion density n(He+) in low electron temperature, T-e= 5-20 eV, plasmas mixed with He. Plasmas were produced in the PISCES-B linear divertor plasma simulator [R. P. Doerner et al., Phys. Scr. T111, 75 (2004)] where the electron densities are n(e) = (1-15 x 10(18) m(-3) and the ionization degree is similar to 1-10%. In the method, the He I line intensity I-HeI at lambda = 447.1 nm is used, instead of the He II line intensity in the conventional method. The radial confinement time of He+ ions is requisite, and is measured to be at a level of the Bohm confinement time. The He+ ion concentration, n(He+) / n(e), is found to be proportional to I-HeI, and to weakly depend on n(e) and T-e. Because of the higher ionization energy of He than other species (D-2, Ne, and Ar)], the measured n(He+) / n(e) becomes systematically lower than the He gas pressure fraction, and agrees with data from an omegatron mass spectrometer.
DOI	10.1063/1.2786063
ISSN	1070-664X