Design of the Fully Digital Beam Position Monitor for Beam Position Measurement in SSRF
Beam position monitor (BPM) is an important part of beam diagnosis for accelerators. BPM processes the voltages signals of position-sensitive detectors (PSD) to retrieve beam position information. A BPM has been designed for Shanghai Synchrotron Radiation Facility. By applying Software Defined Radio technology,a fully digital architecture is implemented. The four channels of periodic pulses from button-type PSDs are bandpass filtered,amplified to get 500MHz sinusoids. Four under-sampling ADCs digitalize these sinusoids. The sampled IF signals are decimated by a ratio of 169 with digital downconverters (DDC) implemented in FPGA. IQ data of DDC are sent to cordic blocks and converted to amplitude and phase data. Amplitude data is x and y position of beams. The initial test result shows that amplitude RMS uncertainty is about-73dB. It may results in-79dB RMS uncertainty of beam position.
Beam Position Measurement Under-sampling Software Defined Radio Analog-Digital Conversion
Hao Zhou Shubin Liu Lei Zhao Kai Chen Han Yan Qi An
Department of Modern Physics,University of Science and Technology of China,Anhui Key Laboratory of Physical Electronics,Hefei 230026,China Key Laboratory of Technologies of Particle Detection & Electronics,Chinese Academy of Sciences
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
1045-1051
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）