During fusion machine operation and due to plasma wall interaction, particles/dust will be created (size ranging from nanometer to tens of micron). Different morphologies of dust are expected to be produced from spherical particles induced by melting of metal after high heat flux interactions (unipolar arcs, ELMs,...) to fractal ones created by accretion. The later point is confirmed by dust collection in a full tungsten (W) environment machine, the WEST tokamak. Indeed, among the collected particles, spherical and complex shape submicron-sized ones are found. Their high specific surface area can be associated with high physico-chemical reactivity.