  The influence of the ion mass on filament propagation in the scrape-off layer
of toroidal magnetised plasmas is analysed for various fusion relevant majority
species, like hydrogen isotopes and helium, on the basis of a computational
isothermal gyrofluid model for the plasma edge. Heavy hydrogen isotope plasmas
show slower outward filament propagation and thus improved confinement
properties compared to light isotope plasmas, regardless of collisionality
regimes. Similarly, filaments in fully ionised helium move more slowly than in
deutrium. Different mass effects on the filament inertia through polarisation,
finite Larmor radius, and parallel dynamics are identified.
