[en] The polarized H^- ion source that Argonne National Laboratory and Yale University are building for the AGS polarized beam facility is based on the crossed-beam concept in which a polarized atomic-hydrogen beam, H₀, is ionized to H^- by a fast neutral cesium beam, Cs₀. We describe our studies which will aid in achieving a high intensity polarized H^- beam. In particular, we describe time-of-flight studies on the atomic beam and the effect of dissociation nozzle cooling on the velocity distribution. The cesium gun design is described, and a brief discussion of the H₀-Cs₀ interaction region is given