›› 2016, Vol. 36 ›› Issue (1): 94-102.doi: 10.3780/j.issn.1000-758X.2016.0016

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A diagnostic scheme for electron density in μ-PPT plasma using H Stark broadening

WANG  Shang-Min1, ZHANG  Jia-Liang2,*, ZHANG  Tian-Ping1,  FENG  Jie1, ,ZHENG  Mao-Fan1,  HUANG  Yong-Jie1   

  1. 1Lanzhou institute of Physics, Lanzhou 730000,China
    2Dalian University of Technology, Dalian 116024,China
  • Received:2015-11-12 Revised:2015-12-10 Online:2016-02-25 Published:2016-02-24

Abstract: A method of electron density measurement    inside discharge channel of pulsed-plasma thruster (PPT) with higher accuracy was proposed,    based on Stark broadening spectrum analysis. By measuring the line profile and the full-width at half-maximum (FWHM) of C atom spectrum emitted by PPT plasma,the electron density can be calculated. But this requires adequate high electron density. If the electron density is lower than 1016 cm-3, the accuracy of diagnosis is dramatically decreased. Therefore, a tiny H tracer based on H atom spectrum of the line profile and the full-width at half-maximum was proposed to measure the electron density. Comparing with the conventional method, it can improve remarkably the accuracy of electron density measurement.

Key words: electron density, Stark broadening, analysis of H atom spectrum, pulsed-plasma thruster, high-precision measurement