Importance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinch

The determination of the plasma confinement propertiesdemand data as the electron temperature, the ionic and electrondensity profiles and the radiative emissivity profiles. Thefocus of this thesis is the importance of radial profiles inspectroscopic diagnostics applied to the EXTRAP-T2Rreversed-fiel...

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Main Author: Gravestijn, Bob
Format: Doctoral Thesis
Language:English
Published: KTH, Fysik 2003
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3656
http://nbn-resolving.de/urn:isbn:91-7283-624-5
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spelling ndltd-UPSALLA1-oai-DiVA.org-kth-36562013-01-08T13:03:51ZImportance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinchengGravestijn, BobKTH, FysikStockholm : Fysik2003reversed-field pinchextap-t2rwuantitaitve plasma spectrosocpyvuv spectroscopyline-integrated electron tempreatureThe determination of the plasma confinement propertiesdemand data as the electron temperature, the ionic and electrondensity profiles and the radiative emissivity profiles. Thefocus of this thesis is the importance of radial profiles inspectroscopic diagnostics applied to the EXTRAP-T2Rreversed-field pinch. EXTRAP-T2R is a resistive shell reversed-field pinch with amagnetic field shell penetration time much longer than therelaxation cycle time scale. Significant improvements inconfinement properties derived by quantitative plasmaspectroscopy in the vacuum ultraviolet are observed compared tothe previous device EXTRAP-T2. The low level of magneticturbulence and the good magnetic surfaces in the edge regionexplain this observed improvement. A current profile controlexperiment reduces the stochastic transport, which is connectedto the dynamo, and improves the confinement in EXTRAP-T2R evenmore. A comparison of the electron temperature estimated by usinga ratio of line intensities from the same ionization stage ofoxygen and the Thomson scattering system shows that thedifference is explained by the different spatial dependence ofthe excited state populations and the corresponding emissivityof these spectral lines. A collisional radiative model givesestimates for radial profiles of impurities which are notmeasured in EXTRAP-T2R. The estimated profiles can in turn beused to determine the radial profile of the effective ioncharge, the emissivity and finally the radiative power. Asinput, the model uses radial profiles. Neutral hydrogen is predominantly present in the boundaryregion of the plasma. Spectroscopic investigations in this areashow very asymmetric spectral lines of hydrogen due to themovement of atoms. The velocity of the hydrogen atoms dependson the type of plasma-wall interaction and their measurementhelps to identify the different interaction processes. Theexistence of hydrogen molecules in the edge complicates theinterpretation of the line shapes and on the determination ofthe particle confinement time. <b>Keywords:</b>Reversed-field pinch, EXTRAP-T2R, quantitativeplasma spectroscopy, VUV spectroscopy, line-integrated electrontemperature, oxygen, profiles, confinement properties, powerbalance, hydrogen, particle confinement time. Doctoral thesis, comprehensive summaryinfo:eu-repo/semantics/doctoralThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3656urn:isbn:91-7283-624-5Trita-FYS, 0280-316X ; 2003:53application/pdfinfo:eu-repo/semantics/openAccess
collection NDLTD
language English
format Doctoral Thesis
sources NDLTD
topic reversed-field pinch
extap-t2r
wuantitaitve plasma spectrosocpy
vuv spectroscopy
line-integrated electron tempreature
spellingShingle reversed-field pinch
extap-t2r
wuantitaitve plasma spectrosocpy
vuv spectroscopy
line-integrated electron tempreature
Gravestijn, Bob
Importance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinch
description The determination of the plasma confinement propertiesdemand data as the electron temperature, the ionic and electrondensity profiles and the radiative emissivity profiles. Thefocus of this thesis is the importance of radial profiles inspectroscopic diagnostics applied to the EXTRAP-T2Rreversed-field pinch. EXTRAP-T2R is a resistive shell reversed-field pinch with amagnetic field shell penetration time much longer than therelaxation cycle time scale. Significant improvements inconfinement properties derived by quantitative plasmaspectroscopy in the vacuum ultraviolet are observed compared tothe previous device EXTRAP-T2. The low level of magneticturbulence and the good magnetic surfaces in the edge regionexplain this observed improvement. A current profile controlexperiment reduces the stochastic transport, which is connectedto the dynamo, and improves the confinement in EXTRAP-T2R evenmore. A comparison of the electron temperature estimated by usinga ratio of line intensities from the same ionization stage ofoxygen and the Thomson scattering system shows that thedifference is explained by the different spatial dependence ofthe excited state populations and the corresponding emissivityof these spectral lines. A collisional radiative model givesestimates for radial profiles of impurities which are notmeasured in EXTRAP-T2R. The estimated profiles can in turn beused to determine the radial profile of the effective ioncharge, the emissivity and finally the radiative power. Asinput, the model uses radial profiles. Neutral hydrogen is predominantly present in the boundaryregion of the plasma. Spectroscopic investigations in this areashow very asymmetric spectral lines of hydrogen due to themovement of atoms. The velocity of the hydrogen atoms dependson the type of plasma-wall interaction and their measurementhelps to identify the different interaction processes. Theexistence of hydrogen molecules in the edge complicates theinterpretation of the line shapes and on the determination ofthe particle confinement time. <b>Keywords:</b>Reversed-field pinch, EXTRAP-T2R, quantitativeplasma spectroscopy, VUV spectroscopy, line-integrated electrontemperature, oxygen, profiles, confinement properties, powerbalance, hydrogen, particle confinement time.
author Gravestijn, Bob
author_facet Gravestijn, Bob
author_sort Gravestijn, Bob
title Importance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinch
title_short Importance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinch
title_full Importance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinch
title_fullStr Importance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinch
title_full_unstemmed Importance of radial profiles in spectroscopic diagnostics applied to the EXTRAP-T2R reversed-field pinch
title_sort importance of radial profiles in spectroscopic diagnostics applied to the extrap-t2r reversed-field pinch
publisher KTH, Fysik
publishDate 2003
url http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3656
http://nbn-resolving.de/urn:isbn:91-7283-624-5
work_keys_str_mv AT gravestijnbob importanceofradialprofilesinspectroscopicdiagnosticsappliedtotheextrapt2rreversedfieldpinch
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