THE DESIGN AND INITIAL TESTING OF THE BEAM POSITION MEASUREMENT SYSTEM IN SSRF BASED ON FULLY DIGITAL SIGNAL PROCESSING |
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| Han Yan, Shubin Liu, Kai Chen, Weihao Wu, Lei Zhao, Qi An, Yongbin Leng, Xing Yi, Yingbing Yan, Longwei Lai |
- Abstract:
- This fully digital beam position measurement system is designed both for beam position monitoring and machine research in Shanghai Synchrotron Radiation Facility (SSRF). The signals received from four position-sensitive detectors (PSD) are narrow pulses with a repetition rate up to 499.654 MHz and a pulse width of around 100 ps, the dynamic range of which could vary over more than 40 dB in machine research. By the employment of the under-sampling technique based on high-speed high-resolution A/D conversion, all the processing procedure is performed fully by the digital signal processing (DSP) algorithms integrated in one single FPGA. A previous incomplete prototype of this system had been designed with simple tests conducted. After debugging and modification, the second version system is designed, and a more systematic test is conducted, which will be presented in details. The initial testing results indicate that this system has achieved a position resolution (at the turn by turn rate of 694 kHz) better than 7 um over the input amplitude range of -40 dBm to 10 dBm.
- Keywords:
- beam position measurement, under-sampling, high-speed high-resolution A/D conversion, fully digital signal processing, SSRF
- Download:
- IMEKO-IWADC-2011-07.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- IWADC 2011
- Title:
16th IMEKO International Workshop on ADC Modeling and Testing - Data Converter Design, Modeling and Testing (together with IEEE ADC Forum) (IWADC)
- Place:
- Orvieto, ITALY
- Time:
- 30 June 2011 - 01 July 2011