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New Approximations and Calibration Methods to Provide Routine Real-Time Polarimetry on JET (Articolo in rivista)

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New Approximations and Calibration Methods to Provide Routine Real-Time Polarimetry on JET (Articolo in rivista) (literal)

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Michela Gelfusa; Andrea Murari; Pasquale Gaudio; Alexandru Boboc; Didler Mazon; Fabio Avino; Ivan Lupelli; F. P. Orsitto; O. Tudisco; JET-EFDA Contributors (2012)
New Approximations and Calibration Methods to Provide Routine Real-Time Polarimetry on JET
in IEEE transactions on plasma science; IEEE-Institute Of Electrical And Electronics Engineers Inc., Piscataway (Stati Uniti d'America)
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Michela Gelfusa; Andrea Murari; Pasquale Gaudio; Alexandru Boboc; Didler Mazon; Fabio Avino; Ivan Lupelli; F. P. Orsitto; O. Tudisco; JET-EFDA Contributors (literal)

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Article number: 6156793 La rivista è pubblicata anche online con ISSN 1939-9375. (literal)

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M. Gelfusa, P. Gaudio, and I. Lupelli are with the JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, U.K. and also with the Associazione EURATOM-ENEA-University of Rome \"Tor Vergata,\" 00133 Roma, Italy; A. Murari is with the JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, U.K. and also with the Consorzio RFX Associazione EURATOM-ENEA per la Fusione, 4-35127 Padova, Italy; A. Boboc is with the JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, U.K. and also with the EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, U.K.; D. Mazon is with the JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, U.K. and also with the Association EURATOM-CEA, CEA Cadarache, 13108 Saint-Paul-lez-Durance, France; F. Avino, F. P. Orsitto, and O. Tudisco are with the JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, U.K. and also with the Associazione EURATOM-ENEA-CR Frascati, 00044 Frascati, Italy. (literal)

Titolo

New Approximations and Calibration Methods to Provide Routine Real-Time Polarimetry on JET (literal)

Abstract

The increasing importance of providing reliable polarimetric measurements in real time, for both machine protection and plasma control, has motivated the development of a quick version of the calibration algorithms for JET polarimeter. This new code, which interprets the calibration procedure performed before each shot, is based on a physical equivalent model of the diagnostic optical path and is valid for any operational regime of JET. It provides results before the plasma breakdown, and, with its estimates of the optical paths parameters, the polarimetric measurements have an accuracy more than sufficient for real-time purposes. New approximate equations have been validated in order to obtain the line integrated density from the newly calibrated horizontal chords, so that also these polarimetric measurements can also be used for density feedback and machine protection. The availability of reliable polarimetric measurements in real time opens new perspectives also to the determination of the plasma boundary, the magnetic equilibrium, and their use in advanced feedback control schemes. (literal)

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