Confinement transitions in TJ-II under Li-coated wall conditions

J. Snchez; M. Acedo; A. Alonso; J. Alonso; P. Alvarez; E. Ascasíbar; A. Baciero; R. Balbín; L. Barrera; E. Blanco; J. Botija; A. De Bustos; E. De La Cal; I. Calvo; A. Cappa; J. M. Carmona; D. Carralero; R. Carrasco; B. A. Carreras; F. Castejón; R. Castro; G. Cataln; A. A. Chmyga; M. Chamorro; L. Eliseev; L. Esteban; T. Estrada; A. Fernndez; R. Fernndez-Gaviln; J. A. Ferreira; J. M. Fontdecaba; C. Fuentes; L. García; I. García-Cortés; R. García-Gómez; J. M. García-Regãa; J. Guasp; L. Guimarais; T. Happel; J. Hernanz; J. Herranz; C. Hidalgo; J. A. Jiménez; A. Jiménez-Denche; R. Jiménez-Gómez; D. Jiménez-Rey; I. Kirpitchev; A. D. Komarov; A. S. Kozachok; L. Krupnik; F. Lapayese; M. Liniers; D. López-Bruna; A. López-Fraguas; J. López-Rzola; A. López-Snchez; S. Lysenko; G. Marcon; F. Martín; V. Maurin; K. J. McCarthy; F. Medina; M. Medrano; A. V. Melnikov; P. Méndez; B. Van Milligen; E. Mirones; I. S. Nedzelskiy; M. Ochando; J. Olivares; J. L. De Pablos; L. Pacios; I. Pastor; M. A. Pedrosa; A. De La Pẽa; A. Pereira; G. Pérez; D. Pérez-Risco; A. Petrov; S. Petrov; A. Portas; D. Pretty; D. Rapisarda; G. Ratt; J. M. Reynolds; E. Rincón; L. Ríos; C. Rodríguez; J. A. Romero; A. Ros; A. Salas; M. Snchez; E. Snchez; E. Snchez-Sarabia; K. Sarksian; J. A. Sebastin; C. Silva; S. Schchepetov; N. Skvortsova; E. R. Solano; A. Soleto; F. Tabarés; D. Tafalla; A. Tarancón; Yu Taschev; J. Tera; A. Tolkachev; V. Tribaldos; V. I. Vargas; J. Vega; G. Velasco; J. L. Velasco; M. Weber; G. Wolfers; B. Zurro

doi:10.1088/0029-5515/49/10/104018

Confinement transitions in TJ-II under Li-coated wall conditions

J. Snchez
, M. Acedo
, A. Alonso
, J. Alonso
, P. Alvarez
, E. Ascasíbar
, A. Baciero
, R. Balbín
, L. Barrera
, E. Blanco
, J. Botija
, A. De Bustos
, E. De La Cal
, I. Calvo
, A. Cappa
, J. M. Carmona
, D. Carralero
, R. Carrasco
, B. A. Carreras
, F. Castejón

R. Castro, G. Cataln, A. A. Chmyga, M. Chamorro, L. Eliseev, L. Esteban, T. Estrada, A. Fernndez, R. Fernndez-Gaviln, J. A. Ferreira, J. M. Fontdecaba, C. Fuentes, L. García, I. García-Cortés, R. García-Gómez, J. M. García-Regãa, J. Guasp, L. Guimarais, T. Happel, J. Hernanz, J. Herranz, C. Hidalgo, J. A. Jiménez, A. Jiménez-Denche, R. Jiménez-Gómez, D. Jiménez-Rey, I. Kirpitchev, A. D. Komarov, A. S. Kozachok, L. Krupnik, F. Lapayese, M. Liniers, D. López-Bruna, A. López-Fraguas, J. López-Rzola, A. López-Snchez, S. Lysenko, G. Marcon, F. Martín, V. Maurin, K. J. McCarthy, F. Medina, M. Medrano, A. V. Melnikov, P. Méndez, B. Van Milligen, E. Mirones, I. S. Nedzelskiy, M. Ochando, J. Olivares, J. L. De Pablos, L. Pacios, I. Pastor, M. A. Pedrosa, A. De La Pẽa, A. Pereira, G. Pérez, D. Pérez-Risco, A. Petrov, S. Petrov, A. Portas, D. Pretty, D. Rapisarda, G. Ratt, J. M. Reynolds, E. Rincón, L. Ríos, C. Rodríguez, J. A. Romero, A. Ros, A. Salas, M. Snchez, E. Snchez, E. Snchez-Sarabia, K. Sarksian, J. A. Sebastin, C. Silva, S. Schchepetov, N. Skvortsova, E. R. Solano, A. Soleto, F. Tabarés, D. Tafalla, A. Tarancón, Yu Taschev, J. Tera, A. Tolkachev, V. Tribaldos, V. I. Vargas, J. Vega, G. Velasco, J. L. Velasco, M. Weber, G. Wolfers, B. Zurro

Research output: Contribution to journal › Article › peer-review

81 Scopus citations

Abstract

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.

Original language	English
Article number	104018
Journal	Nuclear Fusion
Volume	49
Issue number	10
DOIs	https://doi.org/10.1088/0029-5515/49/10/104018
State	Published - 2009
Externally published	Yes

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10.1088/0029-5515/49/10/104018

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Snchez, J., Acedo, M., Alonso, A., Alonso, J., Alvarez, P., Ascasíbar, E., Baciero, A., Balbín, R., Barrera, L., Blanco, E., Botija, J., De Bustos, A., De La Cal, E., Calvo, I., Cappa, A., Carmona, J. M., Carralero, D., Carrasco, R., Carreras, B. A., ... Zurro, B. (2009). Confinement transitions in TJ-II under Li-coated wall conditions. Nuclear Fusion, 49(10), Article 104018. https://doi.org/10.1088/0029-5515/49/10/104018

@article{38c844b1b71b429a9cb829dfd3a20d24,

title = "Confinement transitions in TJ-II under Li-coated wall conditions",

abstract = "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 Te ≈ 250-300 eV, with peaked density, rather flat Te 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.",

author = "J. Snchez and M. Acedo and A. Alonso and J. Alonso and P. Alvarez and E. Ascas{\'i}bar and A. Baciero and R. Balb{\'i}n and L. Barrera and E. Blanco and J. Botija and \{De Bustos\}, A. and \{De La Cal\}, E. and I. Calvo and A. Cappa and Carmona, \{J. M.\} and D. Carralero and R. Carrasco and Carreras, \{B. A.\} and F. Castej{\'o}n and R. Castro and G. Cataln and Chmyga, \{A. A.\} and M. Chamorro and L. Eliseev and L. Esteban and T. Estrada and A. Fernndez and R. Fernndez-Gaviln and Ferreira, \{J. A.\} and Fontdecaba, \{J. M.\} and C. Fuentes and L. Garc{\'i}a and I. Garc{\'i}a-Cort{\'e}s and R. Garc{\'i}a-G{\'o}mez and Garc{\'i}a-Reg{\~a}a, \{J. M.\} and J. Guasp and L. Guimarais and T. Happel and J. Hernanz and J. Herranz and C. Hidalgo and Jim{\'e}nez, \{J. A.\} and A. Jim{\'e}nez-Denche and R. Jim{\'e}nez-G{\'o}mez and D. Jim{\'e}nez-Rey and I. Kirpitchev and Komarov, \{A. D.\} and Kozachok, \{A. S.\} and L. Krupnik and F. Lapayese and M. Liniers and D. L{\'o}pez-Bruna and A. L{\'o}pez-Fraguas and J. L{\'o}pez-Rzola and A. L{\'o}pez-Snchez and S. Lysenko and G. Marcon and F. Mart{\'i}n and V. Maurin and McCarthy, \{K. J.\} and F. Medina and M. Medrano and Melnikov, \{A. V.\} and P. M{\'e}ndez and \{Van Milligen\}, B. and E. Mirones and Nedzelskiy, \{I. S.\} and M. Ochando and J. Olivares and \{De Pablos\}, \{J. L.\} and L. Pacios and I. Pastor and Pedrosa, \{M. A.\} and \{De La Pẽa\}, A. and A. Pereira and G. P{\'e}rez and D. P{\'e}rez-Risco and A. Petrov and S. Petrov and A. Portas and D. Pretty and D. Rapisarda and G. Ratt and Reynolds, \{J. M.\} and E. Rinc{\'o}n and L. R{\'i}os and C. Rodr{\'i}guez and Romero, \{J. A.\} and A. Ros and A. Salas and M. Snchez and E. Snchez and E. Snchez-Sarabia and K. Sarksian and Sebastin, \{J. A.\} and C. Silva and S. Schchepetov and N. Skvortsova and Solano, \{E. R.\} and A. Soleto and F. Tabar{\'e}s and D. Tafalla and A. Taranc{\'o}n and Yu Taschev and J. Tera and A. Tolkachev and V. Tribaldos and Vargas, \{V. I.\} and J. Vega and G. Velasco and Velasco, \{J. L.\} and M. Weber and G. Wolfers and B. Zurro",

year = "2009",

doi = "10.1088/0029-5515/49/10/104018",

language = "Ingl{\'e}s",

volume = "49",

journal = "Nuclear Fusion",

issn = "0029-5515",

number = "10",

}

Snchez, J, Acedo, M, Alonso, A, Alonso, J, Alvarez, P, Ascasíbar, E, Baciero, A, Balbín, R, Barrera, L, Blanco, E, Botija, J, De Bustos, A, De La Cal, E, Calvo, I, Cappa, A, Carmona, JM, Carralero, D, Carrasco, R, Carreras, BA, Castejón, F, Castro, R, Cataln, G, Chmyga, AA, Chamorro, M, Eliseev, L, Esteban, L, Estrada, T, Fernndez, A, Fernndez-Gaviln, R, Ferreira, JA, Fontdecaba, JM, Fuentes, C, García, L, García-Cortés, I, García-Gómez, R, García-Regãa, JM, Guasp, J, Guimarais, L, Happel, T, Hernanz, J, Herranz, J, Hidalgo, C, Jiménez, JA, Jiménez-Denche, A, Jiménez-Gómez, R, Jiménez-Rey, D, Kirpitchev, I, Komarov, AD, Kozachok, AS, Krupnik, L, Lapayese, F, Liniers, M, López-Bruna, D, López-Fraguas, A, López-Rzola, J, López-Snchez, A, Lysenko, S, Marcon, G, Martín, F, Maurin, V, McCarthy, KJ, Medina, F, Medrano, M, Melnikov, AV, Méndez, P, Van Milligen, B, Mirones, E, Nedzelskiy, IS, Ochando, M, Olivares, J, De Pablos, JL, Pacios, L, Pastor, I, Pedrosa, MA, De La Pẽa, A, Pereira, A, Pérez, G, Pérez-Risco, D, Petrov, A, Petrov, S, Portas, A, Pretty, D, Rapisarda, D, Ratt, G, Reynolds, JM, Rincón, E, Ríos, L, Rodríguez, C, Romero, JA, Ros, A, Salas, A, Snchez, M, Snchez, E, Snchez-Sarabia, E, Sarksian, K, Sebastin, JA, Silva, C, Schchepetov, S, Skvortsova, N, Solano, ER, Soleto, A, Tabarés, F, Tafalla, D, Tarancón, A, Taschev, Y, Tera, J, Tolkachev, A, Tribaldos, V, Vargas, VI, Vega, J, Velasco, G, Velasco, JL, Weber, M, Wolfers, G & Zurro, B 2009, 'Confinement transitions in TJ-II under Li-coated wall conditions', Nuclear Fusion, vol. 49, no. 10, 104018. https://doi.org/10.1088/0029-5515/49/10/104018

TY - JOUR

T1 - Confinement transitions in TJ-II under Li-coated wall conditions

AU - Snchez, J.

AU - Acedo, M.

AU - Alonso, A.

AU - Alonso, J.

AU - Alvarez, P.

AU - Ascasíbar, E.

AU - Baciero, A.

AU - Balbín, R.

AU - Barrera, L.

AU - Blanco, E.

AU - Botija, J.

AU - De Bustos, A.

AU - De La Cal, E.

AU - Calvo, I.

AU - Cappa, A.

AU - Carmona, J. M.

AU - Carralero, D.

AU - Carrasco, R.

AU - Carreras, B. A.

AU - Castejón, F.

AU - Castro, R.

AU - Cataln, G.

AU - Chmyga, A. A.

AU - Chamorro, M.

AU - Eliseev, L.

AU - Esteban, L.

AU - Estrada, T.

AU - Fernndez, A.

AU - Fernndez-Gaviln, R.

AU - Ferreira, J. A.

AU - Fontdecaba, J. M.

AU - Fuentes, C.

AU - García, L.

AU - García-Cortés, I.

AU - García-Gómez, R.

AU - García-Regãa, J. M.

AU - Guasp, J.

AU - Guimarais, L.

AU - Happel, T.

AU - Hernanz, J.

AU - Herranz, J.

AU - Hidalgo, C.

AU - Jiménez, J. A.

AU - Jiménez-Denche, A.

AU - Jiménez-Gómez, R.

AU - Jiménez-Rey, D.

AU - Kirpitchev, I.

AU - Komarov, A. D.

AU - Kozachok, A. S.

AU - Krupnik, L.

AU - Lapayese, F.

AU - Liniers, M.

AU - López-Bruna, D.

AU - López-Fraguas, A.

AU - López-Rzola, J.

AU - López-Snchez, A.

AU - Lysenko, S.

AU - Marcon, G.

AU - Martín, F.

AU - Maurin, V.

AU - McCarthy, K. J.

AU - Medina, F.

AU - Medrano, M.

AU - Melnikov, A. V.

AU - Méndez, P.

AU - Van Milligen, B.

AU - Mirones, E.

AU - Nedzelskiy, I. S.

AU - Ochando, M.

AU - Olivares, J.

AU - De Pablos, J. L.

AU - Pacios, L.

AU - Pastor, I.

AU - Pedrosa, M. A.

AU - De La Pẽa, A.

AU - Pereira, A.

AU - Pérez, G.

AU - Pérez-Risco, D.

AU - Petrov, A.

AU - Petrov, S.

AU - Portas, A.

AU - Pretty, D.

AU - Rapisarda, D.

AU - Ratt, G.

AU - Reynolds, J. M.

AU - Rincón, E.

AU - Ríos, L.

AU - Rodríguez, C.

AU - Romero, J. A.

AU - Ros, A.

AU - Salas, A.

AU - Snchez, M.

AU - Snchez, E.

AU - Snchez-Sarabia, E.

AU - Sarksian, K.

AU - Sebastin, J. A.

AU - Silva, C.

AU - Schchepetov, S.

AU - Skvortsova, N.

AU - Solano, E. R.

AU - Soleto, A.

AU - Tabarés, F.

AU - Tafalla, D.

AU - Tarancón, A.

AU - Taschev, Yu

AU - Tera, J.

AU - Tolkachev, A.

AU - Tribaldos, V.

AU - Vargas, V. I.

AU - Vega, J.

AU - Velasco, G.

AU - Velasco, J. L.

AU - Weber, M.

AU - Wolfers, G.

AU - Zurro, B.

PY - 2009

Y1 - 2009

N2 - 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 Te ≈ 250-300 eV, with peaked density, rather flat Te 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.

AB - 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 Te ≈ 250-300 eV, with peaked density, rather flat Te 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.

UR - https://www.scopus.com/pages/publications/70349153838

U2 - 10.1088/0029-5515/49/10/104018

DO - 10.1088/0029-5515/49/10/104018

M3 - Artículo

AN - SCOPUS:70349153838

SN - 0029-5515

VL - 49

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

M1 - 104018

ER -

Confinement transitions in TJ-II under Li-coated wall conditions

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