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Experimental and simulated vuv spectra from the JET Tokamak and the Reversed Field Pinch RFX (Articolo in rivista)

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Experimental and simulated vuv spectra from the JET Tokamak and the Reversed Field Pinch RFX (Articolo in rivista) (literal)

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M.Mattioli 4, K.B. Fournier 5, M.E. Puiatti 1, M.Valisa 1, L. Carraro 1, I. Coffey 6, M. O?Mullane 7, F. Sattin 4, P. Scarin 1 (2002)
Experimental and simulated vuv spectra from the JET Tokamak and the Reversed Field Pinch RFX
in Plasma physics and controlled fusion (Print)
(literal)

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M.Mattioli 4, K.B. Fournier 5, M.E. Puiatti 1, M.Valisa 1, L. Carraro 1, I. Coffey 6, M. O?Mullane 7, F. Sattin 4, P. Scarin 1 (literal)

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The paper presented to be evaluated is a result of a collaboration among scientists operating at Consorzio RFX (which is one of the Italian Research Units part of the European Program on Controlled Thermonuclear Fusion where scientists from CNR, ENEA and Padova University jointly operate), at Lawrence Livermore National Laboratory, at the Belfast Queens University and at the Strathclyde University in Glasgow. The aim of this paper is to review and update the existing atomic physics relative to the impurities present in the Tokamak Jet (the largest tokamak device in the world operating under the European Fusion Development Agreement , EFDA) and the Reversed Field Pinch RFX, the most important Reversed Field Pinch (RFP) experiment in the world. The journal where the paper is published is the most important european journal on plasma physics, where the submitted papers are subjected to a careful referee procedure thus assuring the notoriety and the good quality of the work. (literal)

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Rivista

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Università di Padova, CNR ed ENEA hanno costituito il Consorzio RFX per realizzare congiuntamente attività di ricerca sulla fusione nucleare controllata. Il personale resta dipendente dal proprio ente, precisato nel campo (literal)

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Experimental VUV spectra from the JET tokamak and from the reversed field pinch RFX have been simulated. For the former device both n=2 to n=2 L-shell Ar and Ne spectra (respectively, in the 14.5-43.0 and in the 35.0-80.0 nm ranges) were considered, whereas for RFX only the Ne spectrum was available. The spectra have been observed with the SPRED spectrometer. From the simulation of the spectra, relative sensitivity curves have been obtained for each instrument in the ranges of the simulation. The photon emission coefficients of the lines with wavelengths in the ranges of the experimental spectra were obtained from collisional-radiative models. For Ar and Ne these coefficients have been calculated by the HULLAC atomic physics codes, whereas for C and O the corresponding coefficients have been taken from the ADAS database. Impurity modelling is performed using a one-dimensional impurity transport code, calculating for each atomic species the radial distribution of the impurity ions. The line brightnesses are evaluated in a post-processing subroutine and the simulations of the spectra are obtained. The spectral simulations give confidence in the atomic physics calculations, and allow the determination of the transport coefficients in the plasma regions from which the considered ionisation states emit. Finally, the obtained relative sensitivity curves of the two SPRED spectrometers have been compared with the calibrations performed by the branching ratio technique. (literal)

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1 CNR, 2 UniPD, 3 ENEA, 4 Consorzio RFX (dipendenti), (i dipendenti di 1-2-3 sono anche affiliati al Consorzio), 5 Lawrence Livermore National Laboratory, Livermore, USA, 6 Queens University, Belfast, North Ireland, 7 University of Strathclyde, Glasgow, UK (literal)

Titolo

Experimental and simulated vuv spectra from the JET Tokamak and the Reversed Field Pinch RFX (literal)

Abstract

Experimental VUV spectra from the JET tokamak and from the reversed field pinch RFX have been simulated. For the former device both n=2 to n=2 L-shell Ar and Ne spectra (respectively, in the 14.5-43.0 and in the 35.0-80.0 nm ranges) were considered, whereas for RFX only the Ne spectrum was available. The spectra have been observed with the SPRED spectrometer. From the simulation of the spectra, relative sensitivity curves have been obtained for each instrument in the ranges of the simulation. The photon emission coefficients of the lines with wavelengths in the ranges of the experimental spectra were obtained from collisional-radiative models. For Ar and Ne these coefficients have been calculated by the HULLAC atomic physics codes, whereas for C and O the corresponding coefficients have been taken from the ADAS database. Impurity modelling is performed using a one-dimensional impurity transport code, calculating for each atomic species the radial distribution of the impurity ions. The line brightnesses are evaluated in a post-processing subroutine and the simulations of the spectra are obtained. The spectral simulations give confidence in the atomic physics calculations, and allow the determination of the transport coefficients in the plasma regions from which the considered ionisation states emit. Finally, the obtained relative sensitivity curves of the two SPRED spectrometers have been compared with the calibrations performed by the branching ratio technique. (literal)

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