The influence of displacement damage on helium uptake and retention in tungsten

•Displacement-damaged and undamaged samples exposed to ~ 1018 He/m2s with 100 eV.•He retention lower by factors 3–100 compared with literature data using 300–500 eV He.•He depth profiling by elastic recoil detection and erosion via anodic oxidation.•Deeper He penetration for undamaged samples compared with pre-damaged samples.•He self-trapping or trap-mutation do not dominate for these He fluxes.