Articolo in rivista, 2023, ENG, 10.1017/S0022377823000570

Investigation of the collisionless plasmoid instability based on gyrofluid and gyrokinetic integrated approach

Granier C.;Numata R.; Borgogno D.; Tassi E.; Grasso D.

Université Côte d'Azur, CNRS, Observatoire de la Côte d'Azur, Laboratoire J. L. Lagrange, Boulevard de l'Observatoire, CS 34229, Nice, 06304 Cedex 4, France; Graduate School of Information Science, University of Hyogo, Kobe, 650-0047, Japan; Istituto Dei Sistemi Complessi, CNR, Dipartimento di Energia, Politecnico di Torino, Torino, 10129, Italy

In this work, the development of two-dimensional current sheets with respect to tearing modes, in collisionless plasmas with a strong guide field, is analysed. During their nonlinear evolution, these thin current sheets can become unstable to the formation of plasmoids, which allows the magnetic reconnection process to reach high reconnection rates. We carry out a detailed study of the effect of a finite, which also implies finite electron Larmor radius effects, on the collisionless plasmoid instability. This study is conducted through a comparison of gyrofluid and gyrokinetic simulations. The comparison shows in general a good capability of the gyrofluid models in predicting the plasmoid instability observed with gyrokinetic simulations. We show that the effects of promotes the plasmoid growth. The effect of the closure applied during the derivation of the gyrofluid model is also studied through the comparison among the variations of the different contributions to the total energy

Journal of plasma physics (Print) 89 (4), pp. 905890404-1–905890404-32

Keywords

astrophysical plasmas; plasma instabilities; plasma simulation

CNR authors

Borgogno Dario, Grasso Daniela

CNR institutes

ISC – Istituto dei sistemi complessi