Essential physical quantities of magnetically confined plasmas are derived on a routine basis from bolometric reconstructions. In the last few years at the Joint European Torus (JET), the Maximum Likelihood method has demonstrated the capability of providing reliable reconstructions for this class of ill-posed problems. The article is focused on quantifying the effects of important sources of errors, usually underestimated, that can influence both the reconstructions and the derived quantities. A complete set of phantoms has been used to test the robustness of the technique. The main sources of uncertainties investigated in this contribution are random noise, presence of outliers in the measurements, uncertainty of the position of the magnetic topology, and missing measurements from damaged or unreliable bolometers. The study provides a comprehensive quantification of the uncertainties to associate with most typical emissivities encountered in practice and constitutes a good basis for a more accurate evaluation of the power balances on the JET. Published under license by AIP Publishing.

Peluso, E., Craciunescu, T., Murari, A., Carvalho, P., Gelfusa, M. (2019). A comprehensive study of the uncertainties in bolometric tomography on JET using the maximum likelihood method. REVIEW OF SCIENTIFIC INSTRUMENTS ONLINE, 90(12), 123502 [10.1063/1.5119441].

A comprehensive study of the uncertainties in bolometric tomography on JET using the maximum likelihood method

Peluso E.;Gelfusa M.
2019-01-01

Abstract

Essential physical quantities of magnetically confined plasmas are derived on a routine basis from bolometric reconstructions. In the last few years at the Joint European Torus (JET), the Maximum Likelihood method has demonstrated the capability of providing reliable reconstructions for this class of ill-posed problems. The article is focused on quantifying the effects of important sources of errors, usually underestimated, that can influence both the reconstructions and the derived quantities. A complete set of phantoms has been used to test the robustness of the technique. The main sources of uncertainties investigated in this contribution are random noise, presence of outliers in the measurements, uncertainty of the position of the magnetic topology, and missing measurements from damaged or unreliable bolometers. The study provides a comprehensive quantification of the uncertainties to associate with most typical emissivities encountered in practice and constitutes a good basis for a more accurate evaluation of the power balances on the JET. Published under license by AIP Publishing.
2019
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/18 - FISICA DEI REATTORI NUCLEARI
English
Peluso, E., Craciunescu, T., Murari, A., Carvalho, P., Gelfusa, M. (2019). A comprehensive study of the uncertainties in bolometric tomography on JET using the maximum likelihood method. REVIEW OF SCIENTIFIC INSTRUMENTS ONLINE, 90(12), 123502 [10.1063/1.5119441].
Peluso, E; Craciunescu, T; Murari, A; Carvalho, P; Gelfusa, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/240157
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