OTR based monitor of injection beam for top-up operation of the Spring-8

We have developed an optical transition radiation (OTR) based monitor of injection beam at the Spring-8. The monitor has been installed near the injection point of the storage ring downstream of the beam transport line from the booster synchrotron. A screen made of an aluminum coated polyimide film is used as a nondestructive OTR radiator. A CCD camera with an electric shutter is used to observe the OTR image of the injection beam. The electric shutter is synchronized with the external injection trigger signals. At every injection, the image signal from the CCD camera is captured and analyzed by a personal computer, and the position, size and intensity of the injection beam are recorded by the real-time database of the Spring-8 control system. The OTR screen monitor provides real-time and nondestructive diagnostic tool useful for the top-up operation of the Spring-8. (authors)