Search

As the magneto-resistor technology is developed, applying it to beam instrumentation for the accelerator becomes possible. In this paper, a new principle beam current sensor based on TMR linear sensor is introduced. Feasibility research by simulation and calculation has been done, a study of the critical component for the whole system has been carried out, and all these are presented in this paper. Laboratory test results include the nonlinear error, and resolution analysis is introduced. Specific work plan for the next step of the improvement and upgrade is also referred to.

In order to update the BPM electronic in BEPCII, a high-performance digital BPM processor is designed, and the RF front-end electronic is the key part in the digital BPM processor system. According to the BEPCII physical parameters and ADC under-sampling theorem, the low-noise and high-dynamic-range RF front-end electronic module is designed. This article will introduce filter, RF amplifier, isolation, system test, etc. The experimental results showed that BPM position short-term resolution is better than 100 nm, and long-term resolution is better than 5 μm. It is the first domestic BPM processor that runs stably in the storage ring accelerator for a long time. Meanwhile, the study can help us to establish a solid foundation for the next work of BPM electronics development.