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Development of a new virtual diagnostic for V3FIT (Articolo in rivista)

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Development of a new virtual diagnostic for V3FIT (Articolo in rivista) (literal)

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Trevisan G.L.; Cianciosa M.R.; Terranova D.; Hanson J.D. (2014)
Development of a new virtual diagnostic for V3FIT
in Physics of plasmas; AMER INST PHYSICS, MELVILLE, NY 11747-4501 USA (Stati Uniti d'America)
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http://www.scopus.chttp://apps.webofknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=3&SID=Q2dwrfeqaaMs3I1meqV&page=1&doc=1om/inward/record.url?eid=2-s2.0-84915758186&partnerID=q2rCbXpz; Article Number 122504; e-ISSN: 1089-7674 (literal)

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http://scitation.aip.org/content/aip/journal/pop/21/12/10.1063/1.4903456 (literal)

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1,3 : Consorzio RFX (CNR, ENEA, Università di Padova, Acciaierie Venete SpA), corso Stati Uniti, Padova, 4-35127, Italy; / 2,4 :Auburn University, Physics Department, Auburn, AA, 36849, United States. (literal)

Titolo

Abstract

The determination of plasma equilibria from diagnostic information is a fundamental issue. V3FIT is a fully three-dimensional reconstruction code capable of solving the inverse problem using both magnetic and kinetic measurements. It uses VMEC as core equilibrium solver and supports both free- and fixed-boundary reconstruction approaches. In fixed-boundary mode VMEC does not use explicit information about currents in external coils, even though it has important effects on the shape of the safety factor profile. Indeed, the edge safety factor influences the reversal position in RFP plasmas, which then determines the position of the m=0 island chain and the edge transport properties. In order to exploit such information a new virtual diagnostic has been developed, that thanks to Ampère's law relates the external current through the center of the torus to the circulation of the toroidal magnetic field on the outermost flux surface. The reconstructions that exploit the new diagnostic are indeed found to better interpret the experimental data with respect to edge physics. (literal)

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