Application of Libera BPM at BEPCⅡ for the Early Commissioning

Abstract: With the developments of software radio technique, it not only revolutionizes
the technique in modern communication field, but also brings about technical innovation on the beam instrumentation for accelerators. The digital BPM based on software radio and digital receiver, has gained first successful application in accelerator at SLS. The company of Instrumentation Technologies made many efforts to update this device and finally the family devices-Libera were formed. It integrates the analog RF front end electronics, A/D converter, digital signal processing and synchrony trigger into an all in one measurement system with wideband. The Libera can be used at different types of accelerators and it has the functions of first turn, turn by turn and COD measurement. It plays an important role in the BEPCⅡ early commissioning, especially in the beam circulating and stacking of BER and BPR, and also in the residual orbit oscillation
measurement. In this paper, we introduce some measurement results by using the multifarious function of Libera, such as first turn, tune, residual orbit oscillation and optimum delay time of injection kicker.