Thomson scattering versus modeling of the microwave plasma torch: a long standing discrepancy almost solved

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU137434" target="_blank" >RIV/00216305:26620/20:PU137434 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/20:00117958

Výsledek na webu

<a href="https://pubs.rsc.org/en/content/articlelanding/2020/ja/d0ja00161a#!divAbstract" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2020/ja/d0ja00161a#!divAbstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d0ja00161a" target="_blank" >10.1039/d0ja00161a</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thomson scattering versus modeling of the microwave plasma torch: a long standing discrepancy almost solved

Popis výsledku v původním jazyce

The characterization of plasmas gives much more insight if the results of modeling are compared with those of experiments. In the past, several modeling-experiment studies were performed on the microwave plasma torch (MPT). For the modeling a Global Plasma Model (GPM) was employed and for the experiment Thomson scattering (TS) was used. The same GPM-TS comparison was successfully applied to several other, more robust plasmas. However for the MPT it was found that the comparison led to severe discrepancies. The most salient feature was that the value of the electron temperature,T-e, found by TS, was substantially higher than what GPMs predicted. Several attempts were undertaken to solve this problem by refining the model and its most important input: the gradient of the electron density. The attention for the model implied that the TS technique was not scrutinized sufficiently. Recently it was discovered that the outcome of TS is very sensitive to the spectral fitting procedure. In the past this was carried out by employing the calibrated intensity using Gaussian fitting. However, a procedure based on the fitting of the spectral shape by using modified Gaussian fitting gives better results and leads to a lowerT(e)value, more in the range of the GPM results. This paper discusses the background of the GPM and gives the basis of TS fitting procedures and an analysis of the systematic error that can be made when TS is performed on filamentary MPT-like plasmas.

Název v anglickém jazyce

Thomson scattering versus modeling of the microwave plasma torch: a long standing discrepancy almost solved

Popis výsledku anglicky

The characterization of plasmas gives much more insight if the results of modeling are compared with those of experiments. In the past, several modeling-experiment studies were performed on the microwave plasma torch (MPT). For the modeling a Global Plasma Model (GPM) was employed and for the experiment Thomson scattering (TS) was used. The same GPM-TS comparison was successfully applied to several other, more robust plasmas. However for the MPT it was found that the comparison led to severe discrepancies. The most salient feature was that the value of the electron temperature,T-e, found by TS, was substantially higher than what GPMs predicted. Several attempts were undertaken to solve this problem by refining the model and its most important input: the gradient of the electron density. The attention for the model implied that the TS technique was not scrutinized sufficiently. Recently it was discovered that the outcome of TS is very sensitive to the spectral fitting procedure. In the past this was carried out by employing the calibrated intensity using Gaussian fitting. However, a procedure based on the fitting of the spectral shape by using modified Gaussian fitting gives better results and leads to a lowerT(e)value, more in the range of the GPM results. This paper discusses the background of the GPM and gives the basis of TS fitting procedures and an analysis of the systematic error that can be made when TS is performed on filamentary MPT-like plasmas.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Analytical Atomic Spectrometry

ISSN

0267-9477

e-ISSN

1364-5544

Svazek periodika

35

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

2064-2074

Kód UT WoS článku

000569703600027

EID výsledku v databázi Scopus

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