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plasma electron density Measuring and Processing on the J-TEXT Tokamak

Journal of Donghua University(English Edition) 2011年第6期28卷 576-579页

作者：舒双宝罗家融薛二兵盛静 School of Instrument Science and Opto-electronic Engineering Hefei University of Technology College of Science Donghua University

plasma electron density is one of the most fundamental parameters in the study of tokamak plasma *** method of plasma electron density measuring and processing on the Joint Texas Experimental Tokamak(J-TEXT) was presented in this *** principle of the plasma electron density measuring by hydrogen cyanide(HCN) laser interferometer was *** temperature triglycine sulface(TGS) detector was used to obtain the beat signal of HCN,and phase difference was measured by high-speed acquisition card *** on the signal characteristics,a specific HCN processing algorithm was designed to eliminate the baseline offset accurately and process overturns of HCN signals *** a result,plasma electron density with high accuracy and low noise has been obtained during the J-TEXT tokamak experiment.

关键词： tokamak plasma electron density hydrogen cyanide(HCN) laser triglycine sulface(TGS) detector phase difference measuring

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Laser-induced plasma electron number density:Stark broadening method versus the Saha-Boltzmann equation

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plasma Science and Technology 2017年第2期19卷 43-51页

作者： Arnab SARKAR Manjeet SINGH Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400 085India

We report spectroscopic studies on plasma electron number density of laser-induced plasma produced by ns-Nd：YAG laser light pulses on an aluminum sample in air at atmospheric pressure. The effect of different laser energy and the effect of different laser wavelengths were compared. The experimentally observed line profiles of neutral aluminum have been used to extract the excitation temperature using the Boltzmann plot method, whereas the electron number density has been determined from the Stark broadened as well as using the Saha-Boltzmann equation （SBE）. Each approach was also carried out by using the AI emission line and Mg emission lines. It was observed that the,SBE method generated a little higher electron number density value than the Stark broadening, method, but within the experimental uncertainty range. Comparisons of Ne determined by the two methods show the presence of a linear relation which is independent of laser energy or laser wavelength. These results show the applicability of the SBE method for Are determination, especially when the system does not have any pure emission lines whose electron impact factor is known, Also use of Mg lines gives superior results than Al lines.

关键词： plasma parameter laser induced plasma plasma electron density Saha-Boltzmannmethod Stark broadening method

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Far-Infrared Laser Diagnostics in EAST

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plasma Science and Technology 2011年第3期13卷 347-351页

作者：史楠高翔揭银先张寿彪曾龙王二辉杨耀刘子奚 Institute of plasma Physics Chinese Academy of Sciences Hefei 230031 China

Structure, improvements and experiment results of a vertical three-channel far- in- frared （FIR） hydrogen cyanide （HCN） laser interferometer, operated routinely in EAST to measure the electron density profile, are presented. Moreover, a five-channel deuterium cyanide （DCN） laser interferometer was developed successfully. Some key issues confronted in development, including the economization of working gas and the solution to atmospheric absorption, are resolved and described in detail.

关键词： plasma electron density FIR laser interferometer laser power stabilization,atmospheric absorption

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