Abstract
A kinetic model addressing the destabilization of a current sheet by a microtearing mode is presented. For the first time, the magnetic drift, the electric potential fluctuation and collisions have been included together. As in reduced MHD, the evaluation of the current inside the resistive layer is obtained from a system of two equations linking the vector potential and the electric potential. When the electric field is neglected and using an effective magnetic drift, the magnetic drift is found to be destabilizing when combined with collisions. When both the electric potential and magnetic drift are kept, no analytical tractable solution has been found.
Highlights
In H-mode plasmas, the modelling of the pedestal dynamics is an important issue to predict temperature and density profiles in the tokamak edge and in the core
Model description To better understand the linear mechanisms at play in the microtearing modes (MTM) destabilization and how MTMs affect electron heat transport, a new analytical calculation including collisions, electromagnetic effects and the magnetic drift velocity has been formulated
In this paper, we have presented a derivation of a current sheet model for microtearing modes in a kinetic framework
Summary
In H-mode plasmas, the modelling of the pedestal dynamics is an important issue to predict temperature and density profiles in the tokamak edge and in the core. In [15], using a kinetic approach, we have presented a linear dispersion relation of a slab collisional microtearing mode destabilized by the electron temperature gradient only, neglecting the magnetic drift and the electric potential fluctuations. 2. Model description To better understand the linear mechanisms at play in the MTM destabilization and how MTMs affect electron heat transport, a new analytical calculation including collisions, electromagnetic effects and the magnetic drift velocity has been formulated. Model description To better understand the linear mechanisms at play in the MTM destabilization and how MTMs affect electron heat transport, a new analytical calculation including collisions, electromagnetic effects and the magnetic drift velocity has been formulated In this model, the stability of a current sheet in the vicinity of a resonant surface is investigated in a kinetic framework. The complex form of the functional can be simplified by assuming an effective magnetic drift term
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