Confinement and stability on the TJ-II stellarator

Ascasíbar, E.; Alejaldre, C.; Alonso, Javier; Almoguera, L.; Baciero, A.; Balbín, Rosa; Blanco, E.; Blaumoser, M.; Botija, J.; Brañas, B.; Cappa, Á.; Carrasco, R. C.; Castejón, F.; Cepero, J. R.; Chmyga, A. A.; Doncel, J.; Dreval, M.; Eguilior, S.; Eliseev, L.G.; Estrada, T.; Fedyanin, O.I.; Fernández, Á.; Fontdecaba, J. M.; Fuentes, C.; Díaz, Antonio; Garcı́a-Cortés, I.; Gonçalves, B.; Guasp, J.; Herranz, J.; Hidalgo, A.; Hidalgo, C.; Jiménez, Javier; Kirpitchev, I.; Khrebtov, S. M.; Komarov, A. D.; Kozachok, A. S.; Krupnik, L. I.; Lapayese, F.; Likin, K. M.; Liniers, M.; López‐Bruna, D.; Löpez‐Fraguas, A.; López-Razola, J.; López-Sánchez, Almudena; Luna, E. de la; Malaquias, A.; Martin, Richard L.; Medrano, M.; Melnikov, A. V.; Méndez, P.; McCarthy, K. J.; Medina, F.; Milligen, B. Ph. van; Nedzelskiy, I. S.; Ochando, M. A.; Pacios, Luis F.; Pastor, I.; Pedrosa, M. A.; Peña, A. de la; Petrov, A. E.; Petrov, S. Ya.; Portas, A.; Romero, Jesús; Rodrı́guez-Rodrigo, L.; Salas, Alvaro H.; Sánchez, E.; Sánchez, J.; Sarksian, K. A.; Schchepetov, S.; Скворцова, Н. Н.; Tabarés, F.L.; Tafalla, D.; Tribaldos, V.; Varandas, C.A.F.; Vega, J.; Zurro, B.

doi:10.1088/0741-3335/44/12b/322

Cited by 29 publications

(9 citation statements)

References 31 publications

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“…TJ-II is a four-period low-magnetic shear flexible heliac [13] with mean major and minor radii R = 1.5 m, a = 0.22 m and toroidal field B 0 = 1.0 T. Plasmas are created and heated by ECRH (P ECRH 0.6 MW) with boron or lithium coating of the chamber wall [8]. TJ-II operated with two neutral beam injectors with 30 kV H 0 (P NBI < 0.45 MW per injector), with injection direction along ('co') or opposite ('counter') to the toroidal magnetic field.…”

Section: Methodsmentioning

confidence: 99%

Changes in plasma potential and turbulent particle flux in the core plasma measured by heavy ion beam probe during L–H transitions in the TJ-II stellarator

Melnikov

Eliseev

Estrada³

et al. 2013

Nucl. Fusion

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Plasma potential and turbulent particle flux ΓE×B in the plasma core were measured for the first time during L–H/H–L transitions in the TJ-II heliac using a heavy ion beam probe. The L–H transition is characterized by a simultaneous potential drop ∼−100 V over the whole plasma radius, formation of density pedestal and a strong radial electric field Er between −100 to −150 V cm−1 in the edge (0.8 < ρ < 0.9), strong suppression of the broadband density and potential oscillations and of ΓE×B in the edge and core plasma.

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Section: Methodsmentioning

confidence: 99%

Changes in plasma potential and turbulent particle flux in the core plasma measured by heavy ion beam probe during L–H transitions in the TJ-II stellarator

Melnikov

Eliseev

Estrada³

et al. 2013

Nucl. Fusion

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“…TJ-II is a medium-sized heliac-type helical device [25,26]. Its magnetic configuration is characterized by a high rotational transform and low toroidal field period, N f = 4, a moderate magnetic shear and a magnetic well for good pressuredriven MHD stability.…”

Section: Ep-driven Mhd Modes In Helical Plasmasmentioning

confidence: 99%

Effect of ECH/ECCD on energetic-particle-driven MHD modes in helical plasmas

et al. 2020

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The effect of electron cyclotron heating (ECH) and electron cyclotron current drive (ECCD) on energetic-particle (EP)-driven magnetohydrodynamic (MHD) modes is studied in the helical devices LHD, TJ-II and Heliotron J. We demonstrate that EP-driven MHD modes, including Alfvén eigenmodes (AEs) and energetic particle modes (EPMs), can be controlled by ECH/ECCD. In the LHD device, which has a moderate rotational transform and a high magnetic shear, co-ECCD enhances toroidal AEs (TAEs) and global AEs (GAEs), while counter-ECCD stabilizes them, which improves the neutron rate compared with the co-ECCD case. Counter-ECCD decreases the core rotational transform and increases the magnetic shear, strengthening the continuum damping on the shear Alfvén continua (SAC). In the TJ-II device, which has a high rotational transform, moderate magnetic shear and low toroidal field period, helical AEs (HAEs) appear when the HAE frequency gap of the SAC is changed by counter-ECCD combined with a bootstrap current and neutral-beam-driven current. On the other hand, both co- and counter-ECCD are effective in stabilizing GAEs and EPMs in the Heliotron J device, which has a low rotational transform and low magnetic shear. The experimental results indicate that the magnetic shear has a stabilizing effect regardless of its sign. Modeling analysis using the FAR3d code shows that the growth rates are reduced by both co- and counter-ECCD in Heliotron J, reproducing the experimental results. ECH only affects EP-driven MHD modes, and the experimental results show that the effect depends on the magnetic configuration. In Heliotron J, some modes are stabilized with an increase in ECH power in the low-bumpiness magnetic configuration, while some modes are destabilized in the high- and medium-bumpiness magnetic configurations.

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“…We target the Spanish stellarator TJ-II [2], which is a medium size device of the "Heliac" type in operation in Madrid (Spain) since 1997. Its complex geometry makes difficult the development of numerical tools to study it.…”

Section: Nuclear Fusionmentioning

confidence: 99%

Workflow-Based Data Parallel Applications on the EGEE Production Grid Infrastructure

et al. 2008

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Setting up and deploying complex applications on a Grid infrastructure is still challenging and the programming models are rapidly evolving. Efficiently exploiting Grid parallelism is often not straight forward. In this paper, we report on the techniques used for deploying applications on the EGEE production Grid through four experiments coming from completely different scientific areas: J. Montagnat I3S laboratory, CNRS, Sophia Antipolis, France J. Montagnat (B) EPU, RAINBOW, 930 route des Colles, nuclear fusion, astrophysics and medical imaging. These applications have in common the need for manipulating huge amounts of data and all are computationally intensive. All the cases studied show that the deployment of data intensive applications require the development of more or less elaborated application-level workload management systems on top of the gLite middleware

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Confinement and stability on the TJ-II stellarator

Cited by 29 publications

References 31 publications

Changes in plasma potential and turbulent particle flux in the core plasma measured by heavy ion beam probe during L–H transitions in the TJ-II stellarator

Changes in plasma potential and turbulent particle flux in the core plasma measured by heavy ion beam probe during L–H transitions in the TJ-II stellarator

Effect of ECH/ECCD on energetic-particle-driven MHD modes in helical plasmas

Workflow-Based Data Parallel Applications on the EGEE Production Grid Infrastructure

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