Design and Performance of a Compact Imaging System for the Aps Linac Bunch Compressor

We present the design and performance of a highresolution, high charge sensitivity imaging camera system for the APS linac beam profile measurement. Electron beam distribution is converted to light intensity distribution using standard YAG or optical transition radiation (OTR) screens. Two CCD cameras share the light through a beam splitter, each with its own imaging optics. One camera is normally set to a low magnification to give a full view of the converter screen (20 mm × 15 mm), and the other is set to a high magnification for measuring small beam. The overall dimension of the camera system is 400 mm × 165 mm × 110 mm. The focus and irises are driven by stepper motors and are remotely controlled. The fixed magnification and remotely controlled focus enable high reproducibility during beam-based setup of the optics. On bench test, the camera gave better then 10-μm resolution and better that 1% reproducibility of the magnification.