[en] The quest for the stellarator reactor needs a robust divertor concept. The island-based divertor has worked efficiently in W7-AS and is suitable for devices like W7-X with a robust magnetic configuration that hardly changes with plasma pressure and ensures a small bootstrap current. These conditions guarantee that the island positions and widths do not change substantially during plasma operation. Such divertor is not appropriated either for devices that rely their magnetic configuration on the bootstrap current, like QPS (ORNL, USA) or NCSX (Princeton, USA), or for devices that present high flexibility in their rotational transform values, like TJ-II. For these cases, the flux expansion divertor is a good candidate. This concept is based on intercepting the particle and energy fluxes with a plate located where the magnetic lines are well separated, so that the power flux onto the plates is small. NCSX team is performing studies to develop a divertor based on this concept, consisting of following field lines with an ad-hoc diffusion coefficient of 1 m/s². TJ-II presents several magnetic configurations suitable for such a divertor concept. Exploration of TJ-II capabilities for having a flux-expansion divertor are done by following particle trajectories rather than field lines due to the large drifts that appear in this device. ISDEP code, which follows ion guiding-center orbits including collisions and radial electric field, has been used to study the 3D fluxes in ECRH and NBI plasmas. Beyond the effect of thermal ions, the trajectories of fast ions coming from NBI are considered, using the Monte Carlo Fafner code to estimate the velocities and birth points of fast ions. Comparisons of ISDEP calculations with the results from Langmuir probes, bolometer and Soft X Ray detector arrays are underway. The present results are valuable to explore the viability of the flux expansion divertor in future devices. (author)