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Potential of a Bayesian integrated determination of the ion effective charge via bremsstrahlung and charge exchange spectroscopy in tokamak plasmasVerdoolaege, G. ...Reliable and accurate estimates of the ion effective charge Z(eff) in tokamak plasmas are of key importance with respect to the impurity transport studies and the establishment of thermonuclear burn ... criteria. These issues are of fundamental interest to ITER and reactor operational scenarios in general. However, Z(eff) estimates derived from bremsstrahlung spectroscopy on the one hand and from the weighted summation of individual impurity concentrations obtained via charge exchange spectroscopy (CXS) on the other hand often are not compatible. This is a long-standing problem in fusion plasma diagnosis. A rigorous analysis of uncertainty sources and their propagation in the experimental determination of Z(eff) can contribute significantly to the derivation of a Z(eff) value with reduced uncertainty that is consistent with both the bremsstrahlung and CXS data sets. In this paper, Bayesian probabilitytheory is used in an integrated approach as a powerful tool for an advanced error analysis in the derivation of Z(eff), even in the presence of systematic errors on the data. A simple probabilistic model is proposed for the estimation of Z(eff), first assuming only statistical uncertainty and thentaking into account also the systematic deviations. The obtained Z(eff) estimates have smaller error bars than the Z(eff) values derived from the individual bremsstrahlung and CXS measurements, approaching ITER requirements.The estimates are shown to be consistent with all available information. In addition, the systematic errors on the data are quantized through the requirement of data consistency between different time slices in the acquired measurements.Source: IEEE transactions on plasma science. - ISSN 0093-3813 (Iss. 11, Vol. 38, 2010, str. 3168-3196)Type of material - article, component partPublish date - 2010Language - englishCOBISS.SI-ID - 24722471
Author
Verdoolaege, G. |
Lengar, Igor |
Snoj, Luka, 1981- |
Trkov, Andrej
Topics
jedrska fizika |
fizika plazme |
tokamak
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source: IEEE transactions on plasma science. - ISSN 0093-3813 (Iss. 11, Vol. 38, 2010, str. 3168-3196)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Verdoolaege, G. | ![]() |
Lengar, Igor | 19167 |
Snoj, Luka, 1981- | 27819 |
Trkov, Andrej | 08557 |
Source: Personal bibliographies
and: SICRIS
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