A numerical study of electron-magnetohydrodynamics tearing modes in parameter ranges of experimental interest

Homam Betar (1, 2) , Daniele Del Sarto (3, 4) , A. Ghizzo (3, 4) , F. Brochard (4) , David Zarzoso (1)

1 M2P2 - Laboratoire de Mécanique, Modélisation et Procédés Propres
2 Renaissance Fusion
3 UL - Université de Lorraine
4 IJL - Institut Jean Lamour

We perform a numerical study of the linear dynamics of tearing modes in slab incompressible electron- magnetohydrodynamics (EMHD) by considering some parameter ranges which can be of interest for laboratory plasmas (e.g., helicon devices) or for astrophysics (e.g., solar-wind turbulence). To this purpose several non-ideal effects are simultaneously retained (finite electron inertia, resistivity and electron viscosity) and we make distinction between the dissipation coefficients in the direction parallel and perpendicular to the guide field. We thus identify some new recon- nection regimes, characterized by a departure from the customary monotonic power-law scalings of the growth rates with respect to the non-ideal parameters. The results here presented can provide a useful indication for future studies of EMHD regimes relevant to experiments and for extensions of the EMHD tearing mode modelling to more complete regimes including kinetic effects (e.g., "electron-only" reconnection in kinetic regimes).

Domaines: Physique [physics]; Physique des plasmas [physics.plasm-ph]

Homam Betar, Daniele Del Sarto, A. Ghizzo, F. Brochard, David Zarzoso. A numerical study of electron-magnetohydrodynamics tearing modes in parameter ranges of experimental interest. 2024. ⟨hal-04561813⟩