Preliminary analysis of impurity transport in HL-2A ohmic discharges

Autor:	Deng Wei, Pan Yudong, Zhang Peng, Cui Zheng-Ying, Shi Zhongbing, Huang Yuan, Zheng Yong-Zhen, Sun Ping, Zhou Yan, Yang Qingwei, Chen Wei
Rok vydání:	2007
Předmět:	Materials science General Physics and Astronomy Plasma Laser Signal Preliminary analysis law.invention Impurity law Condensed Matter::Strongly Correlated Electrons Metallic impurities Diffusion (business) Atomic physics Ohmic contact
Zdroj:	Chinese Physics. 16:3451-3457
ISSN:	1741-4199 1009-1963
DOI:	10.1088/1009-1963/16/11/050
Popis:	This paper describes the behaviour of impurity transport in HL-2A ohmic discharges. In 2005, small quantities of metallic impurities (Al, Ni and Ti) were successfully injected into HL-2A plasmas by laser blow-off technique, and their progression was followed by the soft x-ray cameras with good spatial and temporal resolutions. The impurity confinement time is estimated from the characteristic decay time of the soft x-ray signal of the injected impurities, and it is about 30–60 ms. The transport coefficients of impurities (including diffusion coefficient and convection velocity) in radial different region have been derived by using a one-dimensional impurity transport code, the results present that diffusion coefficient is much smaller in the central region of plasmas than the outside of it, and it is much larger than that of neoclassical theory predictions; namely, it is anomalous.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3127d9377e04ba9006ea7c99eb33f326 https://doi.org/10.1088/1009-1963/16/11/050 Zobrazit plný text záznamu