Development of measurement equipment for calibrating beam position monitor in HLS storage ring

An automatic calibration system for the beam position monitor (BPM) of the HLS (Hefei Synchrotron Radiation Light Source) storage ring is described. The system integrated a manipulator for holding a simulated antenna vertically to move in horizontal plane, a signal collector and a data processor. The positioning accuracy of an antenna, thin wire, is monitored by a set of microscopes with reading resolution of 0.1 /spl mu/m. Optical gratings with a veracity of 5 /spl mu/m give the position of the antenna. The system has been used for the 2nd phase of HLS to calibrate the BPM detectors and measured 4 vacuum chambers, which have been installed in the storage ring. Test results show that the performance of the system is good enough for calibration.