Journal ArticleDOI
Thermal load calculations at TJ-II vacuum vessel under neutral beam injection
TLDR
In this article, the neutral beam power transmitted into the helical axis stellarator TJ-II is calculated for the final duct design of TJ-2, where the transmitted beam is intercepted by the first toroid-alfield coil before reaching the plasma.Abstract:
The neutral beam power transmitted into the helical axis stellarator TJ-II is calculated for the final duct design of TJ-II. The transmitted beam is intercepted by the first toroidalfield coil before reaching the plasma. The nontrappedfraction of the beam hits various vacuum vessel components. The adopted design of the graphite thermal shields used as vacuum vessel protection at TJ-II is presented. The design achieves a compromise between maximum power into the torus and minimum loads on sensitive parts. A three-dimensional version of the beam geometric code DENSB is set up to calculate the power loads due to shine-through neutrals on the shields under these circumstances. Power load maps are the input to the finite element code ANSYS for the calculation of temperature distributions. For the usual duty cycle at TJ-II (300-ms pulses every 300 s), the peak surface saturation temperatures at all surfaces remain under 650 °C, well below the tolerable limits for graphite.read more
Citations
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Journal ArticleDOI
Moderation of neoclassical impurity accumulation in high temperature plasmas of helical devices
José Luis Velasco,I. Calvo,Shinsuke Satake,A. Alonso,Masanori Nunami,Masayuki Yokoyama,M. Sato,T. Estrada,J. M. Fontdecaba,Macarena Liniers,K. J. McCarthy,F. Medina,B. Ph. van Milligen,M. A. Ochando,Felix I. Parra,Hideo Sugama,A. Zhezhera,Lhd Team,Tj-Ii Team +18 more
TL;DR: In this paper, the authors discuss how plasmas of very low ion collisionality, similar to those observed in the impurity hole of the Large Helical Device, can be an exception to this general rule, and how a negative radial electric field can coexist with an outward impurity flux.
Journal ArticleDOI
Moderation of neoclassical impurity accumulation in high temperature plasmas of helical devices
José Luis Velasco,I. Calvo,Shinsuke Satake,A. Alonso,Masanori Nunami,Masayuki Yokoyama,M. Sato,T. Estrada,J. M. Fontdecaba,Macarena Liniers,K. J. McCarthy,F. Medina,B. Ph. van Milligen,M. A. Ochando,Felix I. Parra,Felix I. Parra,Hideo Sugama,A. I. Zhezhera +17 more
TL;DR: In this paper, the authors discuss how plasmas of very low ion collisionality, similar to those observed in the impurity hole of the large helical device, can be an exception to this general rule, and how a negative radial electric field can coexist with an outward impurity flux.
Journal ArticleDOI
A flexible luminescent probe to monitor fast ion losses at the edge of the TJ-II stellarator.
D. Jiménez-Rey,B. Zurro,J. Guasp,M. Liniers,A. Baciero,M. Garcia-Munoz,A. Fernández,G. García,L. Rodríguez-Barquero,J. M. Fontdecaba +9 more
TL;DR: A mobile luminescent probe has been developed to detect fast ion losses and suprathermal ions escaping from the plasma of the TJ-II stellarator device, and the first results obtained when operated close to the plasma edge are reported.
Journal ArticleDOI
Review of confinement and transport studies in the TJ-II flexible heliac
C. Alejaldre,L Almoguera,Javier Alonso,E. Ascasíbar,A. Baciero,R. Balbín,M Blaumoser,J. Botija,Beatriz Brañas,E. de la Cal,A. Cappa,R. Carrasco,Francisco Castejón,J. Castellano,J.R. Cepero,C Cremy,J Doncel,S. Eguilior,T. Estrada,Asunción Fernández,C. Fuentes,Angela Garcia,Isabel García-Cortés,J. Guasp,J. Herranz,C. Hidalgo,J. A. Jiménez,I. Kirpitchev,V. Krivenski,I. Labrador,F. Lapayese,K. Likin,Macarena Liniers,A. López-Fraguas,A. López-Sánchez,E. de la Luna,Romualdo Martín,L. Martínez-Laso,K. J. McCarthy,F. Medina,M. Medrano,P. Méndez,B. van Milligen,M. A. Ochando,Luis F. Pacios,I. Pastor,M. A. Pedrosa,A. de la Peña,A. Portas,J. Qin,L. Rodríguez-Rodrigo,J.A. Romero,A. Salas,E. Sánchez,J. Sánchez,Francisco L. Tabarés,D. Tafalla,Victor Tribaldos,Jesús Vega,B. Zurro +59 more
TL;DR: TJ-II is a four period, low magnetic shear stellarator (R = 1.5 m, a < 0.22 m, B 0 ≤ 1.2 T) which was designed to have a high degree of magnetic configuration flexibility as discussed by the authors.
Journal ArticleDOI
Loss cone structure for ions in the TJ-II helical axis stellarator Part I: Properties without a radial electric field
J. Guasp,M. Liniers +1 more
TL;DR: In this article, the authors studied the magnetic field structure of the TJ-II flexible heliac for collisionless ions of low and intermediate energy (0.1-1 keV, roughly).
References
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Journal ArticleDOI
TJ-II Project: A Flexible Heliac Stellarator
Carlos Alejaldre,Jose Javier Alonso Gozalo,Jose Botija Perez,Francisco Castejón Magaña,Jose Ramon Cepero Diaz,Jose Guasp Perez,A. Lopez-Fraguas,Luis Garcia,Vladimir I. Krivenski,Romualdo Martín,A.P. Navarro,Angel Perea,Antonio Rodriguez-Yunta,Mario Sorolla Ayza,Antonio Varias +14 more
TL;DR: The TJ-II as discussed by the authors is a helical-axis stellarator with high-beta operation, flexibility, and a bean-shaped plasma cross section, which can be used for electron cyclotron resonance heating, transport, and magnetohydrodynamics.
Journal ArticleDOI
Theoretical evaluations of neutral beam injection efficiency for the TJ-II helical-axis stellarator
TL;DR: Theoretical evaluations of neutral beam injection (NBI) efficiency for the TJ-II helical-axis stellarator have been done for several expected scenarios using the FASOLT code, an adaptation of the FAFNER three-dimensional NBI Monte Carlo code to the peculiar geometry, vacuum vessel, and helical indented magnetic surfaces of TJII.
Related Papers (5)
Loss cone structure for ions in the TJ-II helical axis stellarator Part I: Properties without a radial electric field
J. Guasp,M. Liniers +1 more