High core electron confinement regimes in FTU plasmas with low- or reversed-magnetic shear and high power density electron-cyclotron-resonance heating

Authors
Buratti, P Barbato, E Bracco, G Cirant, S Crisanti, F Granucci, G Tuccillo, AA Zanza, V Zerbini, M Acitelli, L Alladio, F Angelini, B Apicella, ML Apruzzese, G Bertalot, L Bertocchi, A Borra, M Bruschi, A Buceti, G Cardinali, A Centioli, C Cesario, R Cianfarani, C Ciattaglia, S Cocilovo, V De Angelis, R De Marco, F Esposito, B Frigione, D Gabellieri, L Gatti, G Giovannozzi, E Gourlan, C Grolli, M Imparato, A Kroegler, H Leigheb, M Lovisetto, L Maddaluno, G Maffia, G Marinucci, M Mazzitelli, G Micozzi, P Mirizzi, F Nowak, S Orsitto, FP Pacella, D Panaccione, L Panella, M Ridolfini, VP Pieroni, L Podda, S Righetti, GB Romanelli, F Santini, F Sassi, M Segre, SE Simonetto, A Sozzi, C Sternini, S Tudisco, O Vitale, V Vlad, G Zonca, F
Citation
P. Buratti et al., High core electron confinement regimes in FTU plasmas with low- or reversed-magnetic shear and high power density electron-cyclotron-resonance heating, PHYS REV L, 82(3), 1999, pp. 560-563
Citations number
20
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
3
Year of publication
1999
Pages
560 - 563
Database
ISI
SICI code
0031-9007(19990118)82:3<560:HCECRI>2.0.ZU;2-U
Abstract
Electron temperatures in excess of 8 keV have been obtained by electron-cyc lotron-resonance heating on FTU plasmas at peak densities up to 8 x 10(19) m(-3). The magnetic shear in the plasma core is low or negative, and the el ectron heat diffusivity remains at, or below, the Ohmic level (0.2 m(2)/s), in spite of the very large heating power density (10-20 MW/m(3)) which pro duces extremely high temperature gradients (up to 120 keV/m). The ion heat transport remains at the neoclassical level. [S0031-9007(98)08217-9].