Transport analysis of ohmic, L-mode and improved confinement discharges in FTU

B. Esposito, M. Marinucci, M. Romanelli, G. Bracco, C. Castaldo, V. Cocilovo, E. Giovannozzi, M. Leigheb, G. Monari, S. Nowak, C. Sozzi, O. Tudisco, R. Cesario, D. Frigione, C. Gormezano, G. Granucci, L. Panaccione, V. Pericoli-Ridolfini, L. Pieroni

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Abstract

A thorough investigation of confinement in Frascati Tokamak Upgrade has been carried out on a new database of ohmic, L-mode and advanced scenario discharges (multiple pellet-fuelled, radiation improved and internal transport barriers (ITBs)) obtained with the available auxiliary heating systems, namely electron cyclotron resonant heating, lower hybrid and ion Bernstein wave. A general agreement of the measured τEwith ITER97 L-mode scaling is found in ohmic and L-mode discharges. An improvement of the energy confinement time (TE) of up to about 60% over the ITER97 L-mode scaling has been obtained in ITB discharges, together with a reduction in local electron transport in the region of high pressure gradient, and up to about 30% in pellet-fuelled discharges (where τEas large as ∼120 ms have been reached). The linear density dependence of TE in ohmic discharges has been found to extend above the saturation density threshold in pellet-fuelled plasmas.
Original languageEnglish
Pages (from-to)1793 - 1804
Number of pages12
JournalPlasma Physics and Controlled Fusion
Volume46
Issue number11
DOIs
Publication statusPublished - Nov 2004
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Esposito, B., Marinucci, M., Romanelli, M., Bracco, G., Castaldo, C., Cocilovo, V., ... Pieroni, L. (2004). Transport analysis of ohmic, L-mode and improved confinement discharges in FTU. Plasma Physics and Controlled Fusion, 46(11), 1793 - 1804. https://doi.org/10.1088/0741-3335/46/11/008