Visible spectroscopy as a sensitive diagnostic tool for fusion plasmas
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
To further the understanding and knowledge about fusion plasmas and their behaviour during different conditions, it is important to be able to collect information about the plasma and the processes occurring within it. Visible spectroscopy, or the study of the visible wavelength light emitted by the plasma, is a useful tool in this search for knowledge.
This thesis is based on experiments where visible wavelength light has been measured and analysed in order to determine quantities about the emitting source. Doppler shift measurements of spectral lines have been utilised to determine the toroidal rotation velocities of plasma impurity ions and to study the correlation with mode rotation and the effect of active feedback control of the resistive wall modes. Information on the impurities present in the plasma has been determined and the calibrated intensities of spectral lines has yielded impurity concentrations, particle fluxes and electron temperature and densities. Ion temperatures have been determined from Doppler broadening measurements.
The measured vibrational and rotational band structure of deuterium molecular spectra has been analysed in order to calculate rotational and vibrational temperatures, relative populations and molecular particle fluxes. The effect of the molecular flux on simple calculations of atomic flux has also been studied. Specific molecular states and transitions of deuterium have also been probed with synchrotron radiation to study the level and transition energies.
The measurement and analysis of visible wavelength light has been demonstrated to be a sensitive diagnostic tool in the quest for increased knowledge about fusion plasmas and molecular structure.
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 29 p.
Trita-FYS, ISSN 0280-316X ; 2005:64
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-572ISBN: 91-7178-222-2OAI: oai:DiVA.org:kth-572DiVA: diva2:14473
2005-12-06, Sal FA31, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:15 (English)
QC 201012152005-12-232005-12-232010-12-15Bibliographically approved
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