Signal processing system for beam position monitor at HLS 200 MeV LINAC

The parameter of beam positions at HLS 200 MeV LINAC is very important to injection efficiency. A new strip-line beam position monitor system was designed recently, which is not interceptive to beam, qualified in precision and easy to digitalize the results. The system consists of a stripline structure and a signal processing system. The signal processing system consists of a band pass filter(BPF) with center frequency of 2.856 GHz and bandwidth of 10 MHz, a logarithmic detector, a analog digital converting module, and a data acquisition program based on Labview. The signal processing system takes advantage of the virtual instrument (VI) technique, which is open, modularized, interactive and expandable. The signal processing system has a resolution of 0.1 mm and meets the design requiremen