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

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Authors	OBRUSNÍK Adam SYNEK Petr HUBNER S. VAN DER MULLEN J. J. A. M. ZAJÍČKOVÁ Lenka NIJDAM S.
Year of publication	2016
Type	Article in Periodical
Magazine / Source	PLASMA SOURCES SCIENCE & TECHNOLOGY
MU Faculty or unit	Central European Institute of Technology
Citation
Web	http://iopscience.iop.org/article/10.1088/0963-0252/25/5/055018/meta;jsessionid=4D0782F18109B93E6DCB02BBD852EE8E.ip-10-40-1-105
Doi	http://dx.doi.org/10.1088/0963-0252/25/5/055018
Field	Plasma physics
Keywords	Thomson scattering; laser diagnostics; atmospheric pressure plasma; low temperature plasma; microwave plasma torch; argon/hydrogen
Description	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 8.10(21) 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.
Related projects:	CEITEC 2020