Magnetized plasma

Hi Every body

I am modeling a low pressure (50 mBar) plasma in 2D Axial Symmetric geom and I want to study effect of strong transverse magnetic field (in phi direction) on it. This static magnetic field leads to strong anisotropy in electron mobility and I cant reach a convergent solution by changing in meshing strategies and electric field strength. My model converges in isotropic conditions.
I am looking forward to any solutions for this matter.
Thanks

Ehsan