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论文类型： 期刊论文

发表时间： 2017-11-01

发表刊物： PLASMA SCIENCE & TECHNOLOGY

收录刊物： Scopus、SCIE、EI

卷号： 19

期号： 11

ISSN号： 1009-0630

关键字： laser Thomson scattering; optical emission spectroscopy; cascaded arc plasma; electron density; electron temperature; electron excitation temperature

摘要： As advanced linear plasma sources, cascaded arc plasma devices have been used to generate steady plasma with high electron density, high particle flux and low electron temperature. To measure electron density and electron temperature of the plasma device accurately, a laser Thomson scattering (LTS) system, which is generally recognized as the most precise plasma diagnostic method, has been established in our lab in Dalian University of Technology. The electron density has been measured successfully in the region of 4.5 x 10(19) m(-3) to 7.1 x 10(20) m(-3) and electron temperature in the region of 0.18 eV to 0.58 eV. For comparison, an optical emission spectroscopy (OES) system was established as well. The results showed that the electron excitation temperature (configuration temperature) measured by OES is significantly higher than the electron temperature (kinetic electron temperature) measured by LTS by up to 40% in the given discharge conditions. The results indicate that the cascaded arc plasma is recombining plasma and it is not in local thermodynamic equilibrium (LTE). This leads to significant error using OES when characterizing the electron temperature in a non- LTE plasma.