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| 1 | DBPM signal processing with field programmable gate arrays显示文摘DBPM system performance is determined by the design and implementation of beam position signal processing algorithm.In order to develop the system,a beam position signal processing algorithm is implemented on FPGA.The hardware is a PMC board ICS-1554A-002(GE Corp.)with FPGA chip XC5VSX95T.This paper adopts quadrature frequency mixing to down convert high frequency signal to base.Different from conventional method,the mixing is implemented by CORDIC algorithm.The algorithm theory and implementation details are discussed in this paper.As the board contains no front end gain controller,this paper introduces a published patent-pending technique that has been adopted to realize the function in digital logic.The whole design is implemented with VHDL language. An on-line evaluation has been carried on SSRF(Shanghai Synchrotron Radiation Facility)storage ring.Results indicate that the system turn-by-turn data can measure the real beam movement accurately,and system resolution is 1.1μm. | LAI Longwei LENG Yongbin YI Xing YAN Yingbing ZHANG Ning YANG Guisen WANG Baopeng XIONG Yun | 2011 | Nuclear Science and Techniques2011，22，3： | 10 |
| 2 | Development of the bunch-by-bunch beam current acquisition system at SSRF显示文摘In this paper,we report the development of a bunch-by-bunch beam current acquisition system.Through a waveform-reconstruction algorithm,the system realizes high equivalent sampling rate with a relatively low inherent rate.Based on the EPICS environment,information communication with other systems can be achieved.Preliminary test results in commissioning the SSRF storage ring show that the system can reconstruct the beam waveform of single bunch,providing a convenient and reliable method for the top-up operation in the future. | HUANG Siting LENG Yongbin YAN Yingbing | 2009 | Nuclear Science and Techniques2009，20，2： | 4 |
| 3 | Quantitative Metal Magnetic Memory Reliability Modeling for Welded Joints显示文摘Metal magnetic memory(MMM) testing has been widely used to detect welded joints. However, load levels, environmental magnetic field, and measurement noises make the MMM data dispersive and bring difficulty to quantitative evaluation. In order to promote the development of quantitative MMM reliability assessment, a new MMM model is presented for welded joints. Steel Q235 welded specimens are tested along the longitudinal and horizontal lines by TSC-2M-8 instrument in the tensile fatigue experiments. The X-ray testing is carried out synchronously to verify the MMM results. It is found that MMM testing can detect the hidden crack earlier than X-ray testing. Moreover, the MMM gradient vector sum K_(vs) is sensitive to the damage degree, especially at early and hidden damage stages. Considering the dispersion of MMM data, the K_(vs) statistical law is investigated, which shows that K_(vs) obeys Gaussian distribution. So K_(vs) is the suitable MMM parameter to establish reliability model of welded joints. At last, the original quantitative MMM reliability model is first presented based on the improved stress strength interference theory. It is shown that the reliability degree R gradually decreases with the decreasing of the residual life ratio T, and the maximal error between prediction reliability degree R_1 and verification reliability degree R_2 is 9.15%. This presented method provides a novel tool of reliability testing and evaluating in practical engineering for welded joints. | XING Haiyan DANG Yongbin WANG Ben LENG Jiancheng | 2016 | Chinese Journal of Mechanical Engineering2016，29，2： | 4 |
| 4 | Study of algorithms of phase advance measurement between BPMs and its application in SSRF显示文摘As a third generation light source, Shanghai Synchrotron Radiation Facility (SSRF) has up to 140 beam position monitors (BPM) installed to monitor the beam dynamics on its storage ring. Once the operation mode is chosen, the betatron functions are determined. Since the sinusoidal betatron oscillation is the dominant component of the transverse motion, these BPMs can be used to measure the motion to get the betatron functions. Three methods are compared to calculate the phase advance among the BPMs in this paper, aiming to find one or more feasible ways to check the beam optics in SSRF. Some experiments have also been made to verify the practicality of the phase information. | CHEN Zhichu LENG Yongbin YUAN Renxian YAN Yingbing ZHOU Weimin | 2013 | Nuclear Science and Techniques2013，24，1： | 4 |
| 5 | RF front-end for digital beam position monitor signal processor显示文摘RF circuit board has a significant impact on performance of the Digital Beam Position Monitor (DBPM) in storage ring of a synchrotron radiation facility.In this paper,a front-end RF board is designed for DBPM,and schematics of the RF board and the test results are given.In view of the inevitable inconsistency in the multi-channel circuit,a calibration circuit is designed to reduce such an influence.The test results show that the calibration method is useful for beam current dependence which is sensitive to channels inconsistency. | YI Xing LENG Yongbin LAI Longwei ZHANG Ning YANG Guisen | 2011 | Nuclear Science and Techniques2011，22，2： | 4 |
| 6 | A beam position measurement system of fully digital signal processing at SSRF显示文摘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. | YAN Han ZHAO Lei LIU Shubin CHEN Kat WU Weihao AN Qi LENG Yongbin YI Xing YAN Yingbing LAI Longwei | 2012 | Nuclear Science and Techniques2012，23，2： | 3 |
| 7 | Design and measurement of signal processing system for cavity beam position monitor显示文摘In this paper,in order to achieve the output signal processing of cavity beam position monitor(CBPM),we develop a digital intermediate frequency receiver architecture based signal processing system,which consists of radio frequency(RF) front end and high speed data acquisition board.The beam position resolution in the CBPM signal processing system is superior to 1μm.Two signal processing algorithms,fast Fourier transform(FFT) and digital down converter(DDC),are evaluated offline using MATLAB platform,and both can be used to achieve,the CW input signal,position resolutions of 0.31μm and 0.10μm at -16 dBm.The DDC algorithm for its good compatibility is downloaded into the FPGA to realize online measurement,reaching the position resolution of 0.49μm due to truncation error.The whole system works well and the performance meets design target. | WANG Baopeng LENG Yongbin YU Luyang ZHOU Weimin YUAN Renxian CHEN Zhichu | 2013 | Nuclear Science and Techniques2013，24，2： | 3 |
| 8 | Baseline recovery method to measure bunch charge under low-current mode of SSRF显示文摘The top-up injection mode of Shanghai Synchrotron Radiation Facility(SSRF) needs precise measurement of the beam bunch charges.This is performed by an integration current transformer,but the beam current is too low to neglect the background noise.In order to wipe out the noise coming from the ground loops,the adaptable polynomial fitting method is used to extract the baseline,instead of using the constant background or the linear background model. Test results show that the system resolution can be improved to <3%. | CHEN Zhichu LENG Yongbin ZOU Yi YAN Yingbin ZHOU Weimin | 2011 | Nuclear Science and Techniques2011，22，5： | 3 |
| 9 | Monitoring the charge bunch-by-bunch for the SSRF storage ring:Development and application显示文摘Bunch charge uniformity controlling is very important for top-up operation of the storage ring.In order to monitor filling pattern and measure the bunch charge precisely,a PXI waveform digitizer-based data acquisition system has been developed to retrieve bunch charge information from BPM pickup signals.An effective sampling rate is extended to 400 GHz by waveform rebuilding technology,which overlays multi-turn data into single turn with real time sampling rate of 8 GHz.An on-line evaluation indicates that resolution and linearity of the charge measurement are better than 0.5% at input range of 0.5-12nC. | LENG Yongbin YAN Yingbin YU Luyang YUAN Renxian CHEN Zhichu ZHOU Weimin | 2010 | Nuclear Science and Techniques2010，21，4： | 2 |
| 10 | Performance evaluation of BPM sys- tem in SSRF using PCA method显示文摘 | CHEN Zhichu LENG Yongbin YAN Ying- bing | 2014 | Chinese Physics C2014，38，08： | 1 |
| 11 | Transfiguration of extracting mirror in synchrotron radiation system at SSRF显示文摘The first extracting mirror is very important for synchrotron radiation monitor (SRM). The SRM system of SSRF (Shanghai Synchrotron Radiation Facility) should extract the visible light with low optical distortion. The analysis of SR power spectrum and heat transfiguration based on Matlab is introduced in this paper, which will be used in calibration. One beryllium mirror with water-cooling is used to transmit X-ray and reflect visible light to satisfy the measurement request. The existing system suffers from a dynamic problem in some beam physics study. The system includes optics, image acquisition and interferometers. One of the instruments is a digital camera providing the image of the beam transverse profile. The hardware configuration will be summarized. The synchrotron radiation measurement system has been in operation in SSRF for more than one year. | CHEN Jie HUANG GuoQing ZHOU WeiMin YE KaiRong LENG YongBin | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 1 |
| 12 | An on-line data acquisition system of oscilloscope-embedded input/output controller for cavity BPM measurement显示文摘Cavity beam position monitor(BPM) is widely used in a precise electron beam position measurement. Based on high performance oscilloscope-embedded EPICS input/output controller,we developed an on-line cavity BPM signal processing system for fast data acquisition solution when designing a cavity BPM.Also,methods for extracting the position information from cavity pickup signals and calibration algorithm are included in this solution. | ZHANG Ning WANG Baopeng LENG Yongbin | 2011 | Nuclear Science and Techniques2011，22，6： | 1 |
| 13 | Digital bunch-by-bunch transverse feedback system at SSRF显示文摘In order to suppress multi-bunch couple instabilities caused by transverse impedance, a bunch-by-bunch transverse feedback system based on a FPGA digital processor is commissioned at SSRF storage ring. The RF front end has two COD pre-rejected attenuators for increasing the system arrangement and signal noise ratio, and the 3*RF Local signal comes from the BPM's sum signal using a FIR filter for avoiding the effect of longitudinal oscillation. The digital processor receives the coupled horizontal and vertical oscillation signals in the base band and transforms the coupled signals to the horizontal and vertical feedback signals with two series double-zeroes FIR filters. A matlab GUI is applied for producing the FIR coefficients when the tune is shifted. The horizontal and vertical Kickers have a special design for increasing the shunt impedance. Then the multi-bunch instabilities are suppressed respectively and the minimum damping time is about 0.4 ms. | YUAN RenXian LENG YongBin YU LuYang HAN LiFeng YE KaiRong | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 1 |
| 14 | An embedded single-board computer for BPM of SSRF显示文摘An embedded single-board computer (SBC) system based on AT91RM9200 was designed for monitoring and controlling the digital beam position monitor system of Shanghai Synchrotron Radiation Facility (SSRF) through the Virtex-4 FPGA in the digital processing board.The SBC transfers the configuration commands from the remote EPICS to the FPGA,and calculates the beam position data.The interface between the FPGA and the SBC is the Static Memory Controller (SMC) with a peak transfer speed of up to 349 Mbps.The 100 Mb Ethernet is used for data transfer between the EPICS and SBC board,and a serial port serves as monitoring the status of the embedded system.Test results indicate that the SBC board functions well. | CHEN Kai LIU Shubin YAN Han WU Weihao ZHAO Lei AN Qi LENG Yongbin YI Xing YAN Yingbing LAI Longwei | 2011 | Nuclear Science and Techniques2011，22，4： | 0 |
| 15 | EPICS interface to Libera electron beam position monitor显示文摘SSRF diagnostics system will adopt a new generation digital electron beam position processor,Libera,as the signal condition,signal processing and data acquisition device for beam position monitor.In order to provide a uniform data and control interface for users,we developed an EPICS interface based on Control System Programming Interface (CSPI) layer,allowing the performance of the electron beam to be monitored through EPICS channels.In this interface a new record type for BPM was defined and its associated support routines were implemented. | YAN Yingbing LENG Yongbin LIU Dekang CHEN Yongzhong YIN Chongxian | 2008 | Nuclear Science and Techniques2008，19，2： | 0 |
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