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Your search keyword '"Velasco, J.-L."' showing total 8 results
Start Over Author "Velasco, J.-L." Journal plasma physics and controlled fusion
8 results on '"Velasco, J.-L."'

1. EUROfusion-theory and advanced simulation coordination (E-TASC): programme and the role of high performance computing

Author

Litaudon, X, primary, Jenko, F, additional, Borba, D, additional, Borodin, D V, additional, Braams, B J, additional, Brezinsek, S, additional, Calvo, I, additional, Coelho, R, additional, Donné, A J H, additional, Embréus, O, additional, Farina, D, additional, Görler, T, additional, Graves, J P, additional, Hatzky, R, additional, Hillesheim, J, additional, Imbeaux, F, additional, Kalupin, D, additional, Kamendje, R, additional, Kim, H-T, additional, Meyer, H, additional, Militello, F, additional, Nordlund, K, additional, Roach, C, additional, Robin, F, additional, Romanelli, M, additional, Schluck, F, additional, Serre, E, additional, Sonnendrücker, E, additional, Strand, P, additional, Tamain, P, additional, Tskhakaya, D, additional, Velasco, J L, additional, Villard, L, additional, Wiesen, S, additional, Wilson, H, additional, and Zonca, F, additional

Published
2022
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2. Oscillatory relaxation of zonal flows in a multi-species stellarator plasma

Author

Sánchez, E., Calvo, I., Velasco, J. L., Medina, F., Alonso, A., Monreal, P., Kleiber, R., team, the TJ-II, and TJ-II Team

Subjects
Physics, Oscillation, Extrapolation, FOS: Physical sciences, Electron, Plasma, Condensed Matter Physics, Kinetic energy, 01 natural sciences, Physics - Plasma Physics, 010305 fluids & plasmas, Computational physics, law.invention, Ion, Plasma Physics (physics.plasm-ph), Nuclear Energy and Engineering, Physics::Plasma Physics, law, 0103 physical sciences, Relaxation (physics), 010306 general physics, Stellarator
Abstract

The low frequency oscillatory relaxation of zonal potential perturbations is studied numerically in the TJ-II stellarator (where it was experimentally detected for the first time). It is studied in full global gyrokinetic simulations of multi-species plasmas. The oscillation frequency obtained is compared with predictions based on single-species simulations using simplified analytical relations. It is shown that the frequency of this oscillation for a multi-species plasma can be accurately obtained from single-species calculations using extrapolation formulas. The damping of the oscillation and the influence of the different inter-species collisions is studied in detail. It is concluded that taking into account multiple kinetic ions and electrons with impurity concentrations realistic for TJ-II plasmas allows to account for the values of frequency and damping rate in zonal flows relaxations observed experimentally., 11 figures, 22 pages

Published
2018
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4. Collisionless damping of flows in the TJ-II stellarator

Author

Sánchez, E, primary, Kleiber, R, additional, Hatzky, R, additional, Borchardt, M, additional, Monreal, P, additional, Castejón, F, additional, López-Fraguas, A, additional, Sáez, X, additional, Velasco, J L, additional, Calvo, I, additional, Alonso, A, additional, and López-Bruna, D, additional

Published
2012
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