A beam position measurement system of fully digital signal processing at SSRF

SYNCHROTRON SCIENCE AND TECHNOLOGY

A beam position measurement system of fully digital signal processing at SSRF

YAN Han，

ZHAO Lei，

LIU Shubin，

CHEN Kai，

WU Weihao，

AN Qi，

LENG Yongbin，

YI Xing，

YAN Yingbing，

LAI Longwei

Nuclear Science and Techniques

Vol.23, No.2

pp.75-82

Published in print 20 Apr 2012

DOI：10.13538/j.1001-8042/nst.23.75-82

34201

This fully digital beam position measurement instrument is designed for beam position monitoring and machine research in Shanghai Synchrotron Radiation Facility. The signals received from four position-sensitive detectors are narrow pulses with a repetition rate up to 499.654 MHz and a pulse width of around 100 ps, and their dynamic range 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 algorithms integrated in one single Field Programmable Gate Array. This system functions well in the laboratory and commissioning tests, demonstrating a position resolution (at the turn by turn rate of 694 kHz) better than 7 μm over the input amplitude range of –40 dBm to 10 dBm which is well beyond the requirement.

Beam position measurementFully digital signal processingHigh-speed high-resolution A/D conversionSSRFUnder-sampling

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