Recent characterizations of electron beams from the APS linac

The Advanced Photon Source (APS) facility includes an S-band linear accelerator (linac) that normally provides beam for the injection system of the 7-GeV storage ring. This beam is usually generated by one of two RF thermionic guns or the RF photocathode (PC) gun under special circumstances. When the beams are not required for injection, we may characterize them at a station located at the end of the linac. At this station we have begun a retrofit and upgrade of the optics on the diagnostics table that is outside of the linac enclosures. For beam transverse profiling studies, a CCD camera was used to image the beam spot at the YAG:Ce screen or the optical transition radiation (OTR) screen. In using the quadrupole field scanning technique we demonstrate that the YAG:Ce saturation effect is present under these conditions so that OTR imaging is needed for PC gun beam. A Hamamatsu C5680 streak camera with OTR and a zero-phasing RF technique with an electron spectrometer were used for bunch length measurements of beam from a newly-installed RF thermionic gun. These results will also be presented.