  Fusion-born alpha particles in ITER disruption simulations are investigated
as a possible drive of Alfv\'enic instabilities. The ability of these waves to
expel runaway electron (RE) seed particles is explored in the pursuit of a
passive, inherent RE mitigation scenario. The spatiotemporal evolution of the
alpha particle distribution during the disruption is calculated using the
linearized Fokker-Planck solver CODION coupled to a fluid disruption
simulation. These simulations are done in the limit of no alpha particle
transport during the thermal quench, which can be seen as a most pessimistic
situation where there is also no RE seed transport. Under these assumptions,
the radial anisotropy of the resulting alpha population provides free energy to
drive Alfv\'enic modes during the quench phase of the disruption. We use the
linear gyrokinetic magnetohydrodynamic code LIGKA to calculate the Alfv\'en
spectrum and find that the equilibrium is capable of sustaining a wide range of
modes. The self-consistent evolution of the mode amplitudes and the alpha
distribution is calculated utilizing the wave-particle interaction tool HAGIS.
Intermediate mode number ($n=7-15,~22-26$) Toroidal Alfv\'en Eigenmodes (TAEs)
are shown to saturate at an amplitude of up to $\delta B /B \approx 0.1$\% in
the spatial regimes crucial for RE seed formation. We find that the mode
amplitudes are predicted to be sufficiently large to permit the possibility of
significant radial transport of runaway electrons.

Plasma Physics