The advanced photon source (APS) linear accelerator as a source of slow positrons ☆

The advanced photon source [1] linear accelerator (linac) system consists of a 200 MeV, 2856 MHz S-band electron linac, a 2 radiation-length thick tungsten target for positron production, and a 450 MeV positron linac [2]. The linac is briefly described, and some possibilities for its use as a slow positron source are discussed.