Coherent and incoherent Thomson scattering on an argon/hydrogen microwave plasma torch with transient behaviour

A. Obrusník, P. Synek, S. Hübner, J.J.A.M. van der Mullen, L. Zajíčková, S. Nijdam

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Abstract

A new method of processing time-integrated coherent Thomson scattering spectra is presented, which provides not only the electron density and temperature but also information about the transient behaviour of the plasma. Therefore, it is an alternative to single-shot Thomson scattering measurements as long as the scattering is coherent. The method is applied to a microwave plasma torch operating in argon or a mixture of argon with hydrogen at atmospheric pressure. Electron densities up to 8 · 1021 m-3 (ionization degree above 10-3) were observed, which is more than two times higher than presented in earlier works on comparable discharges. Additionally, a parametric study with respect to the argon/hydrogen ratio and the input power was carried out and the results are discussed together with earlier Stark broadening measurements on the same plasma.

Original languageEnglish
Article number055018
Pages (from-to)1-13
JournalPlasma Sources Science and Technology
Volume25
Issue number5
DOIs
Publication statusPublished - 9 Sep 2016

Keywords

  • argon/hydrogen
  • atmospheric pressure plasma
  • laser diagnostics
  • low temperature plasma
  • microwave plasma torch
  • Thomson scattering

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