Zobrazeno 1 - 10
of 439
pro vyhledávání: '"Regana, J."'
Autor:
Carralero, D., Estrada, T., García-Regaña, J. M., Sánchez, E., Windisch, T., Alonso, A., Maragkoudakis, E., Brandt, C., Brunner, K. J., Gallego-Castillo, C., Rahbarnia, K., Thienpondt, H., Team, the Wendelstein 7-X
In this work, we present the first experimental evidence of the presence of zonal flow (ZF) structures in the optimized stellarator Wendelstein 7-X. Using an assortment of diagnostics, flux surface-uniform, electrostatic flow oscillations have been m
Externí odkaz:
http://arxiv.org/abs/2406.12514
Autor:
García-Regaña, J. M., Calvo, I., Sánchez, E., Thiendpondt, H., Velasco, J. L., Capitán, J. A.
CIEMAT-QI4 is a quasi-isodynamic stellarator configuration that simultaneously features very good fast-ion confinement in a broad range of $\beta$ values, low neoclassical transport and bootstrap current, and ideal magnetohydrodynamic stability up to
Externí odkaz:
http://arxiv.org/abs/2404.16440
Autor:
González-Jerez, A., García-Regaña, J. M., Calvo, I., Carralero, D., Estrada, T., Sánchez, E., Barnes, M., Team, the W7-X
The first experimental campaigns of Wendelstein 7-X (W7-X) have shown that turbulence plays a decisive role in the performance of neoclassically optimized stellarators. This stresses the importance of understanding microturbulence from the theoretica
Externí odkaz:
http://arxiv.org/abs/2312.10221
Autor:
Podavini, L., Zocco, A., García-Regaña, J. M., Barnes, M., Parra, F. I., Mishchenko, A., Helander, P.
Electrostatic gyrokinetic instabilities and turbulence in the Wendelstein 7-X stellarator are studied. Particular attention is paid to the ion-temperature-gradient (ITG) instability and its character close to marginal stability [Floquet-type turbulen
Externí odkaz:
http://arxiv.org/abs/2311.04342
A systematic study of the impact of impurities on the turbulent heat fluxes is presented for Wendelstein 7-X. By means of nonlinear multispecies gyrokinetic simulations, it is shown that impurities, depending on the sign of their density gradient, ca
Externí odkaz:
http://arxiv.org/abs/2305.16805
Autor:
Thienpondt, H., García-Regaña, J. M., Calvo, I., Alonso, J. A., Velasco, J. L., González-Jerez, A., Barnes, M., Brunner, K., Ford, O., Fuchert, G., Knauer, J., Pasch, E., Vanó, L., team, the Wendelstein 7-X
Publikováno v:
Physical Review Research 5 (2023) L022053
In reactor-relevant plasmas, neoclassical transport drives an outward particle flux in the core of large stellarators and predicts strongly hollow density profiles. However, this theoretical prediction is contradicted by experiments. In particular, i
Externí odkaz:
http://arxiv.org/abs/2209.04194
Autor:
Carralero, D., Estrada, T., Maragkoudakis, E., Windisch, T., Alonso, J. A., Velasco, J. L., Ford, O., Jakubowski, M., Lazerson, S., Beurskens, M., Bozhenkov, S., Calvo, I., Damm, H., Fuchert, G., García-Regaña, J. M., Höfel, U., Marushchenko, N., Pablant, N., Sánchez, E., Smith, H. M., Pasch, E., Stange, T.
A recent characterization of core turbulence carried out with a Doppler reflectometer in the optimized stellarator Wendelstein 7-X (W7-X) found that discharges achieving high ion temperatures at the core featured an ITG-like suppression of density fl
Externí odkaz:
http://arxiv.org/abs/2110.00277
Autor:
Alonso, J. A., Calvo, I., Carralero, D., Velasco, J. L., García-Regaña, J. M., Palermo, I., Rapisarda, D.
The ongoing development of electromagnets based on High Temperature Superconductors has led to the conceptual exploration of high-magnetic-field fusion reactors of the tokamak type, operating at on-axis fields above 10 T. In this work we explore the
Externí odkaz:
http://arxiv.org/abs/2109.15189
Autor:
González-Jerez, A., Xanthopoulos, P., García-Regaña, J. M., Calvo, I., Alcusón, J., Bañón-Navarro, A., Barnes, M., Parra, F. I., Geiger, J.
The first experimental campaigns have proven that, due to the optimization of the magnetic configuration with respect to neoclassical transport, the contribution of turbulence is essential to understand and predict the total particle and energy trans
Externí odkaz:
http://arxiv.org/abs/2107.06060
Autor:
García-Regaña, J. M., Barnes, M., Calvo, I., González-Jerez, A., Thienpondt, H., Sánchez, E., Parra, F. I., -Onge, D. St.
Publikováno v:
Nucl. Fusion 61 116019 2021
A large diffusive turbulent contribution to the radial impurity transport in Wendelstein 7-X (W7-X) plasmas has been experimentally inferred during the first campaigns and numerically confirmed by means of gyrokinetic simulations with the code stella
Externí odkaz:
http://arxiv.org/abs/2106.05017