@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS037 prodottidellaricerca:prodotto prodotto:ID26117 . @prefix pubblicazioni: . @prefix unitaDiPersonaleInterno: . unitaDiPersonaleInterno:MATRICOLA147 pubblicazioni:autoreCNRDi prodotto:ID26117 . @prefix modulo: . modulo:ID2195 prodottidellaricerca:prodotto prodotto:ID26117 . @prefix rdf: . @prefix retescientifica: . prodotto:ID26117 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID26117 rdfs:label "Residual analysis of the equilibrium reconstruction quality on JET (Articolo in rivista)"@en . @prefix xsd: . prodotto:ID26117 pubblicazioni:anno "2011-01-01T00:00:00+01:00"^^xsd:gYear ; pubblicazioni:doi "10.1088/0029-5515/51/5/053012"^^xsd:string . @prefix skos: . prodotto:ID26117 skos:altLabel "
A. Murari; D. Mazon; M. Gelfusa; M. Folschette; T. Quilichini; JET-EFDA Contributors (2011)
Residual analysis of the equilibrium reconstruction quality on JET
in Nuclear fusion; International Atomic Energy Agency, Vienna (Austria); IOP Publishing Ltd., Bristol BS1 6BE (Regno Unito)
"^^rdf:HTML ; pubblicazioni:autori "A. Murari; D. Mazon; M. Gelfusa; M. Folschette; T. Quilichini; JET-EFDA Contributors"^^xsd:string ; pubblicazioni:paginaInizio "53012"^^xsd:string ; pubblicazioni:altreInformazioni "Article Number: 053012 -\nLa rivista \u00E8 pubblicata anche online con ISSN 1741-4326 (Publisher: Institute of Physics Publishing, Bristol, GB)"^^xsd:string ; pubblicazioni:url "http://iopscience.iop.org/0029-5515/51/5/053012/"^^xsd:string ; pubblicazioni:numeroVolume "51"^^xsd:string . @prefix ns11: . prodotto:ID26117 pubblicazioni:rivista ns11:ID395883 ; pubblicazioni:note "Issue: 5; Article Number: 053012"^^xsd:string ; pubblicazioni:pagineTotali "18"^^xsd:string ; pubblicazioni:numeroFascicolo "5"^^xsd:string ; skos:note "Scopu"^^xsd:string , "ISI Web of Science (WOS)"^^xsd:string ; pubblicazioni:affiliazioni "1 Consorzio RFX-Associazione EURATOM ENEA per la Fusione, I-35127 Padova, Italy; - 2 Association EURATOM-CEA, CEA Cadarache, 13108 Saint-Paul-lez-Durance, France; - 3 Associazione EURATOM-ENEA-University of Rome 'Tor Vergata', Roma, Italy; - 4 \u00C9cole Centrale de Nantes Engineering College, 44000 Nantes, France; - 5 Arts et M\u00E9tiers Paris Tech Engineering College (ENSAM), 13100 Aix-en-Provence, France. - (A. Murari1, D. Mazon2, M. Gelfusa3, M. Folschette4, T. Quilichini5 and JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, UK Contributors)"^^xsd:string ; pubblicazioni:titolo "Residual analysis of the equilibrium reconstruction quality on JET"^^xsd:string ; prodottidellaricerca:abstract "Anextended set of statistical tests, aimed at assessing the quality of the magnetic reconstructions in JET, obtained with the code EFIT using the external magnetic measurements, is described and the results reported in detail. In addition to the traditional analysis of the global distributions of the residuals (the difference between the actual measurements and their reconstructions from the equilibrium), to determine to what extent they approximate a Gaussian, more sophisticated correlation tests have been performed. Since EFIT solves a highly non-linear equation, tests adequate for multi-input multi-output, non-linear systems have been implemented. Not only the reconstruction of the pickup coil signals but also the accuracy of the plasma boundary has been investigated. The results indicate quite clearly that the errors in the reconstruction of the pickup coils are not negligible. The coils, whose residuals present skewed monomodal distributions (distributions asymmetric with respect to their maximum value), are affected by average errors of the order of more than one millitesla and multimodal distributions of the residuals (distributions presenting more than one local maximum) are quite common. Also the correlation of the residuals is typically outside the 95% limits for a good model in typically more than 70% of the cases. With regard to the plasma boundary, the situation is better since the errors in the distances of the plasma from the wall are typically of the order of 1 cm. On the other hand, in this case the autocorrelations of the residuals are also well outside the 95% confidence interval for random residuals. A detailed analysis of the correlations indicates that the main reasons for the imperfections in the magnetic reconstructions do not reside in the measurements, since there is no evidence of systematic errors or problems with the calibrations. Therefore, the main improvements are to be expected by refinements in the used equilibrium code EFIT, whose constraints and boundary conditions are probably not the most appropriate to model H mode plasmas."@en . @prefix ns12: . prodotto:ID26117 pubblicazioni:editore ns12:ID6572 , ns12:ID12293 ; prodottidellaricerca:prodottoDi modulo:ID2195 , istituto:CDS037 ; pubblicazioni:autoreCNR unitaDiPersonaleInterno:MATRICOLA147 . @prefix parolechiave: . prodotto:ID26117 parolechiave:insiemeDiParoleChiave . ns12:ID12293 pubblicazioni:editoreDi prodotto:ID26117 . ns11:ID395883 pubblicazioni:rivistaDi prodotto:ID26117 . ns12:ID6572 pubblicazioni:editoreDi prodotto:ID26117 . parolechiave:insiemeDiParoleChiaveDi prodotto:ID26117 .