Zobrazeno 1 - 10
of 2 818
pro vyhledávání: '"Barnes, M A"'
Starting from the assumption that saturation of plasma turbulence driven by temperature-gradient instabilities in fusion plasmas is achieved by a local energy cascade between a long-wavelength outer scale, where energy is injected into the fluctuatio
Externí odkaz:
http://arxiv.org/abs/2405.00854
Efficient control of turbulent heat transport is crucial for magnetic confinement fusion reactors. This work discusses the complex interplay between density gradients and micro-instabilities, shedding light on their impact on turbulent heat transport
Externí odkaz:
http://arxiv.org/abs/2404.09929
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
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:
Hardman, M. R., Parra, F. I., Patel, B. S., Roach, C. M., Ruiz, J. Ruiz, Barnes, M., Dickinson, D., Dorland, W., Parisi, J. F., St-Onge, D., Wilson, H.
In magnetic confinement fusion devices, the ratio of the plasma pressure to the magnetic field energy, $\beta$, can become sufficiently large that electromagnetic microinstabilities become unstable, driving turbulence that distorts or reconnects the
Externí odkaz:
http://arxiv.org/abs/2208.10615
We formulate a generalized periodic boundary condition as a limit of the standard twist-and-shift parallel boundary condition that is suitable for simulations of plasmas with low magnetic shear. This is done by applying a phase shift in the binormal
Externí odkaz:
http://arxiv.org/abs/2208.02202
Autor:
Waagaard, E., Barnes, M. J., Bartmann, W., Borburgh, J., Ducimetière, L. S., Kramer, T., Stadlbauer, T., Trubacova, P., Velotti, F. M.
The Super Proton Synchrotron (SPS) injection system plays a fundamental role to preserve the quality of injected high-brightness beams for the Large Hadron Collider (LHC) physics program and to maintain the maximum storable intensity. The present sys
Externí odkaz:
http://arxiv.org/abs/2206.11571
Autor:
Parisi, J. F., Parra, F. I., Roach, C. M., Hardman, M. R., Schekochihin, A. A., Abel, I. G., Aiba, N., Ball, J., Barnes, M., Chapman-Oplopoiou, B., Dickinson, D., Dorland, W., Giroud, C., Hatch, D. R., Hillesheim, J. C., Ruiz, J. Ruiz, Saarelma, S., St-Onge, D.
Nonlinear multiscale gyrokinetic simulations of a Joint European Torus edge pedestal are used to show that electron-temperature-gradient (ETG) turbulence has a rich three-dimensional structure, varying strongly according to the local magnetic-field c
Externí odkaz:
http://arxiv.org/abs/2203.00831
Autor:
Ruiz, J. Ruiz, Parra, F. I., Hall-Chen, V. H., Christen, N., Barnes, M., Candy, J., Garcia, J., Giroud, C., Guttenfelder, W., Hillesheim, J. C., Holland, C., Howard, N. T., Ren, Y., White, A. E., contributors., JET
A linear response, local model for the DBS amplitude applied to gyrokinetic simulations shows that radial correlation Doppler reflectometry measurements (RCDR, Schirmer et al., Plasma Phys. Control. Fusion 49 1019 (2007)) are not sensitive to the ave
Externí odkaz:
http://arxiv.org/abs/2201.06324