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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2014 > Séminaires 2014 > Le lundi 30 juin à 14h

Le lundi 30 juin à 14h

Ryusuke NUMATA (Graduate School of Simulation Studies, University of Hyogo) - "Ion and electron heating during magnetic reconnection in weakly collisional plasmas"

Lieu  : Palaiseau, salle de l’aile 0 (exLIX)

Abstract  :
Magnetic reconnection is a commonly observed fundamental process in both astrophysical and fusion plasmas. It allows topological change of
magnetic field lines, and converts the free energy in the magnetic field into various forms of energy, such as bulk plasma flows, plasma
heating, or non-thermal particle acceleration. In this talk, we discuss ion and electron heating due to kinetic effects during magnetic reconnection in weakly collisional plasmas.

In weakly collisional plasmas, phase mixing processes caused by kinetic effects, such as Landau damping and finite Larmor radius effects, create oscillatory structures in velocity space, which must eventually regularized by collisions. Therefore, even if collisions are in- frequent, energy dissipation and resulting plasma heating may
be significant.

We present gyrokinetic simulations of magnetic reconnection, and discuss the relative and absolute importance of ion and electron heating due to the phase mixing. Electron parallel phase mixing is shown to be large in low beta plasmas. A significant fraction of the released magnetic energy is dissipated from the system, which turns
into heating of background plasmas. In high beta plasma, ion heating becomes comparable to that of electrons. A detailed dissipation/heating mechanism, such as when and where heating occurs, will be discussed.


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)