| Autor: |
J.L. de Pablos, Francisco Castejón, R. Fernández-Gavilán, Victor Tribaldos, G. Catalán, V. I. Vargas, Marley Vanegas Chamorro, David Rapisarda, R. Balbín, E. Mirones, J. Botija, A. S. Kozachok, K. Sarksian, L. Esteban, R. Carrasco, G. Marcon, I. García-Cortés, A.D. Komarov, S. E. Lysenko, J.A. Jiménez, A. Pereira, J. Sánchez, J. A. Alonso, J. M. Carmona, E. Rincón, J. Hernanz, J. Tera, J. Herranz, A.A. Chmyga, M. Acedo, B. Zurro, José Luis Velasco, C. Rodríguez, Alfonso Tarancón, D. Jiménez-Rey, R. Castro, C. Fuentes, A. Ros, Enrique Ascasibar, F. Martín, L. Ríos, A. de la Peña, Jorge Ferreira, D. Tafalla, A. Tolkachev, Luis Garcia, D. Carralero, B. van Milligen, Yu.I. Taschev, M. Sánchez, G. Velasco, Ángela Fernández, L. I. Krupnik, A. Baciero, P. Álvarez, M. Liniers, M. A. Pedrosa, E. de la Cal, Ivan Calvo, A. Cappa, A. Jiménez-Denche, J. M. Fontdecaba, A. Soleto, J. M. Garcia-Regana, Nina N. Skvortsova, J. Vega, E. Sánchez, L. Pacios, A. de Bustos, T. Happel, D. López-Bruna, V. Maurin, T. Estrada, S. Petrov, P. Méndez, D. Pérez-Risco, J. Guasp, J.A. Sebastián, J. M. Reynolds, Alberto Alonso, G.A. Rattá, E. Sánchez-Sarabia, L.G. Eliseev, A.V. Melnikov, R. Jiménez-Gómez, A. López-Sánchez, A. Portas, Benjamin A. Carreras, M. A. Ochando, M. Weber, L. Barrera, Kieran J. McCarthy, E. Blanco, J. Olivares, G. Wolfers, D. G. Pretty, L. Guimarais, A Salas, German Perez, Francisco L. Tabarés, F. Lapayese, C. Hidalgo, F. Medina, A. López-Fraguas, J.A. Romero, E. R. Solano, I. Kirpitchev, S. Schchepetov, R. García-Gómez, I.S. Nedzelskiy, A. Petrov, M. Medrano, I. Pastor, Carlos A. Silva, J. López-Razola |
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ResearcherID |
| Popis: |
This paper presents the latest results on confinement studies in the TJ-II stellarator. The inherently strong plasma–wall interaction of TJ-II has been successfully reduced after lithium coating by vacuum evaporation. Besides H retention and low Z, Li was chosen because there exists a reactor-oriented interest in this element, thus giving special relevance to the investigation of its properties. The Li-coating has led to important changes in plasma performance. Particularly, the effective density limit in NBI plasmas has been extended reaching central values of 8 × 1019 m−3 and T e ≈ 250–300 eV, with peaked density, rather flat T e profiles and higher ion temperatures. Due to the achieved density control, a second type of transition has been added to the low density ones previously observed in ECRH plasmas: higher density transitions characterized by the fall in Hα emission, the onset of steep density gradient and the reduction in the turbulence; which are characteristics of transition to the H mode. Confinement studies in ECH plasmas indicate that lowest order magnetic resonances, even in a low shear environment, locally reduce the effective electron heat diffusivities, while Alfven eigenmodes destabilized in NBI plasmas can influence fast ion confinement. |
| Databáze: |
OpenAIRE |
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