Measurement of electron density and electron temperature of a cascaded arc plasma using laser Thomson scattering compared to an optical emission spectroscopic approach

Yong WANG (王勇); Cong LI (李聪); Jielin SHI (石劼霖); Xingwei WU (吴兴伟); Hongbin DING (丁洪斌)

doi:10.1088/2058-6272/aa861d

Plasma Science and Technology > 2017 > 19(11): 115403. > DOI: 10.1088/2058-6272/aa861d

Yong WANG (王勇), Cong LI (李聪), Jielin SHI (石劼霖), Xingwei WU (吴兴伟), Hongbin DING (丁洪斌). Measurement of electron density and electron temperature of a cascaded arc plasma using laser Thomson scattering compared to an optical emission spectroscopic approach[J]. Plasma Science and Technology, 2017, 19(11): 115403. DOI: 10.1088/2058-6272/aa861d

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Measurement of electron density and electron temperature of a cascaded arc plasma using laser Thomson scattering compared to an optical emission spectroscopic approach

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, People’s Republic of China

Funds: This work was supported by the National Magnetic Confinement Fusion Science Program of China (No. 2013GB109005) and the Fundamental Research Funds for the Central Universities (Nos. DUT15RC(3)072, DUT15TD44, DUT16TD13).

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Received Date: April 16, 2017

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Abstract

Abstract

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 theplasmadeviceaccurately, alaser 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 4.5×10¹⁹ m^-3 to 7.1×10²⁰ 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 (conguration 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.

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References (34)

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