Research and measurement of BPM system at HLS LINAC

BPM system newly designed at HLS Linac has been installed and applied in beam based experiments. This paper introduces the structure of BPM system, signal processing module, mapping results and measurement results of beam based experiment. The BPM system has a dynamic range of not less than 40 dBm, beam position resolution of less than 100 μm, horizontal sensitivity of 1.61 dB/mm and vertical sensitivity of 1.51 dB/mm. The results of experiment between corrector strength and BPM shows that the newly designed BPM system can acquire the beam positions information correctly, and the horizontal and vertical correction coefficients of the correctors are 0.46 mm/A and 0.58 mm/A respectively, and the horizontal and vertical beam positions at BPM are 0.83 mm and -0.57 mm respectively with the default value of correctors. (authors)