Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements

Autor:	Mihir Pandya, X. Ma, J. L. Herfindal, S. F. Knowlton, David Ennis, J.D. Hebert, M.C. ArchMiller, Gregory Hartwell, David Maurer, James D. Hanson, Peter Traverso, Mark Cianciosa, N. A. Roberds
Rok vydání:	2015
Předmět:	Physics Toroid Safety factor Rotational symmetry Plasma Condensed Matter Physics Magnetic flux Computational physics law.invention Physics::Plasma Physics law Plasma diagnostics Atomic physics Current density Stellarator
Zdroj:	Physics of Plasmas. 22:122509
ISSN:	1089-7674 1070-664X
Popis:	Non-axisymmetric free-boundary equilibrium reconstructions of stellarator plasmas are performed for discharges in which the magnetic configuration is strongly modified by ohmically driven plasma current. These studies were performed on the compact toroidal hybrid device using the V3FIT reconstruction code with a set of 50 magnetic diagnostics external to the plasma. With the assumption of closed magnetic flux surfaces, the reconstructions using external magnetic measurements allow accurate estimates of the net toroidal flux within the last closed flux surface, the edge safety factor, and the plasma shape of these highly non-axisymmetric plasmas. The inversion radius of standard sawteeth is used to infer the current profile near the magnetic axis; with external magnetic diagnostics alone, the current density profile is imprecisely reconstructed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a9859edeb92276f7ecd64b8ca2d4e751 https://doi.org/10.1063/1.4938031 Zobrazit plný text záznamu