Speaker
Description
Pressure anisotropy due to auxiliary heated fast ions or runaway electrons can significantly
impact the macroscopic magnetic equilibrium. Moreover, since the plasma toroidal
diamagnetism is predominantly impacted by the perpendicular pressure, measurements of the
outside poloidal magnetic field combined with measurements of the toroidal flux allow to
distinguish between both components, as shown in [1]. In scenarios of predominantly parallel
anisotropy, inverse aspect ratio asymptotic expansions of the equations predict a weak impact
on the overall geometry. Moreover, standard derivations of force balance in the presence of
energetic particles assume a prescribed shape for their distribution function such as the
modified bi-Maxwellian [2], and employ the trace limit to neglect them in the quasineutrality.
It is thus necessary to assess whether the latter effects are indeed negligible with respect to the parallel anisotropy.
