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Spatial resolution of the JET Thomson scattering system (Articolo in rivista)

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Spatial resolution of the JET Thomson scattering system (Articolo in rivista) (literal)

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L. Frassinetti; M.N.A. Beurskens; R. Scannell; T. H. Osborne; J. Flanagan; M. Kempenaars; M. Maslov; R. Pasqualotto; M. Walsh; and JET-EFDA Contributors (2012)
Spatial resolution of the JET Thomson scattering system
in Review of scientific instruments; American Institute of Physics, Melville [NY] (Stati Uniti d'America)
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L. Frassinetti; M.N.A. Beurskens; R. Scannell; T. H. Osborne; J. Flanagan; M. Kempenaars; M. Maslov; R. Pasqualotto; M. Walsh; and JET-EFDA Contributors (literal)

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Article Number: 013506; La rivista è pubblicata anche online con ISSN 1089-7623. (literal)

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1 School of Electrical Engineering, Royal Institute of Technology KTH, Association EURATOM-VR, SE-10044 Stockholm, Sweden; 2 EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, United Kingdom; 3 General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA; 4 ITER Organization, CS 90 046, F-13067 Saint Paul lez Durance Cedex, France; 5 Consorzio RFX, Associazione EURATOM-Enea sulla fusione, Corso Stati Uniti 4, I-35127 Padova, Italy. (L. Frassinetti 1, M. N. A. Beurskens 2, R. Scannell 2, T. H. Osborne 3, J. Flanagan 2, M. Kempenaars 2, M. Maslov 4, R. Pasqualotto 5, M. Walsh 1,4, and JET-EFDA Contributors) (literal)

Titolo

Abstract

The instrument function of the high resolution Thomson scattering (HRTS) diagnostic in the Joint European Torus (JET) has been calculated for use in improved pedestal profile analysis. The full width at half maximum (FWHM) of the spatial instrument response is (22 ± 1) mm for the original HRTS system configuration and depends on the particular magnetic topology of the JET plasmas. An improvement to the optical design of the laser input system is presented. The spatial smearing across magnetic flux surfaces is reduced in this design. The new input system has been implemented (from JPN 78742, July 2009) and the HRTS instrument function corresponding to the new configuration has been improved to approximately FWHM = (9.8 ± 0.8) mm. The reconstructed instrument kernels are used in combination with an ad hoc forward deconvolution procedure for pedestal analysis. This procedure produces good results for both the old and new setups, but the reliability of the deconvolved profiles is greatly reduced when the pedestal width is of the same order as, or less than the FWHM of the instrument kernel. (literal)

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