After many years of research and development, the Shanghai Institute of Applied Physics, Chinese Academy of Sciences has completed the development of prototypes and prototypes of the first set of digital beam signal processors in China. It has now been mass-produced and applied in Shanghai Light Sources (SSRF) and Shanghai Soft X. Three large-scale accelerators, such as the ray free electron laser (SXFEL) device and the Dalian coherent light source (DCLS) device, were put into operation on the line, with nearly 80 units in total. The processor's laboratory test signal to noise ratio of 80dB, the beam through a single test relative position resolution is better than one thousandth. The results of the beam experiments completed on the Shanghai light source storage ring show that the circle-by-circle position resolution reaches sub-micrometers, which meets the position monitoring accuracy requirement of the light source operation and can be used for the upgrade and reconstruction of the Shanghai light source beam flow measurement system. The results of beam experiments performed on the Dalian coherent light source device show that the resolution of the strip BPM system and cavity BPM system using the processor at 500 pC is 4 μm and 0.4 μm, respectively, satisfying the ultra-high position resolution of the device. The design requirements, processor performance to the international advanced level of similar equipment.
The digital beam signal processor is one of the key beam measuring devices for accelerator devices, and has a wide range of applications. There are mature commercial products in the world, but in order to facilitate secondary development and save equipment costs, the current international major equipment such as NSLS-II, LCLS-II, SwissFEL and European XFEL have developed digital signal processors and have gradually Put into use, but there is no domestic self-developed product. Under this background, Shanghai Yingshi started to develop the digital beam signal processor in 2010. In 2012, it successfully developed a DBPM prototype for storage rings and a small batch process prototype. Afterwards, with the help of the opportunity for the launch of the free electron laser device project, it was determined that a signal processor independently developed in the FEL device was used to overcome the technical difficulties required for quality control in the mass production process, and to improve the overall production of this type of processor. The testing process has laid a solid technical foundation for the research and construction of Shanghai Yingwu Group and China's follow-up large-scale accelerator devices, filling the gap in the development of special instrumentation equipment for particle beam diagnostics in China.
The processor uses a high-speed AD in conjunction with the FPGA module to complete signal acquisition and processing. It can implement real-time complex signal processing algorithms. After configuring different core signal processing units, it can be used for beam signal processing of storage rings and linear accelerators, respectively. Extremely wide application prospects. Shanghai Yingwu will also develop more analog signal processing front-ends and digital signal processing algorithms based on this processor to further expand its application range.
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