Finite-beta effects of non-Maxwellian fast ions in gyrokinetics

The presence of relatively small concentrations of fast ions is known to have a significant effect on the Alfv\'enic physics of fusion plasmas. These fast ions have large gyroradii and are usually non-Maxwellian, so the low-collisionality ordering of gyrokinetics is an approprite tool. Here, we use the \texttt{GS2} gyrokinetics code to study finite-beta nonlinear effects in the presence of non-Maxwellian fast ions.