[en] An experimental facility has been developed to carry out permeation experiments for candidate first-wall materials subjected to high fluxes of energetic hydrogen isotope ions. The experimental facility consists of (a) an ion-beam system for production of intense, mass-analyzed ion beams with energies variable from 500 eV to 10 keV, (b) a target chamber system for directing an ion beam onto a heated target and for measuring various implantation-related experimental parameters, and (c) a downstream system for measuring the implanted gas which permeates the specimen. The target chamber and downstream system are equipped with diagnostic capabilities to permit simultaneous measurement of the permeation, reemission, and sputtering effects for target materials