Photon beam position monitor with spring system in HLS

A new wire photon beam position monitor with a spring system was designed and installed in the machine diagnostic beamline in Hefei Light Source(HLS). The linearity range is 4 mm, and the sensitivity is about 0.197 9 mm-1. The beam current has a little effect on the synchrotron radiation vertical size. The signal-to-noise ratio and the linearity can be improved, but the sensitivity decreases with a positive bias voltage applied to the copper block.