针对自由电子激光装置(Free Electron Laser,FEL)对束流位置测量的需求,研制了可同时用于条带束流位置检测器(Stripline Beam Position Monitor,SBPM)和腔式束流位置检测器(Cavity Beam Position Monitor,CBPM)信号处理的数字化束流位...针对自由电子激光装置(Free Electron Laser,FEL)对束流位置测量的需求,研制了可同时用于条带束流位置检测器(Stripline Beam Position Monitor,SBPM)和腔式束流位置检测器(Cavity Beam Position Monitor,CBPM)信号处理的数字化束流位置信号处理器(Digital Beam Position Measurement processor,DBPM)。该处理器为一体化的嵌入式结构,以现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)为系统核心,采用分布式的实验物理及工业控制系统(Experiment Physics and Industrial Control System,EPICS)进行远程数据交互。处理器对SBPM和CBPM系统的测试分辨率在0.5 n C流强时分别达到4μm和0.4μm,达到设计指标,成功应用于大连相干光源(Dalian Coherent Light Source,DCLS),并将应用于上海软X射线自由电子激光装置(Shanghai X-ray Free Electron Laser,SXFEL),是国内首台自主研制成功并实现工程应用的DBPM处理器。展开更多
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...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.展开更多
上海高重复频率硬X射线自由电子激光装置(Shanghai HIgh repetition rate XFEL aNd Extreme light facility,SHINE)使用低温超导高频腔加速电子,电子能量可以到达8 GeV。对于SHINE的电子束团横向截面测量将使用丝扫描这种半拦截式的截...上海高重复频率硬X射线自由电子激光装置(Shanghai HIgh repetition rate XFEL aNd Extreme light facility,SHINE)使用低温超导高频腔加速电子,电子能量可以到达8 GeV。对于SHINE的电子束团横向截面测量将使用丝扫描这种半拦截式的截面测量方法,产生的次级粒子数量较拦截式测量方法(如截面靶小)可以减小超导腔失超的风险,但需要实现束损探测器的信号与电机位置同步采集。本文基于Zynq-UltraScale+型片上系统设计与实现了丝扫描系统数据采集系统,首先对该数据采集系统的实现方式作了详细描述,然后利用实验平台检验了电机位置测量的正确性,并验证了同步采集探测器信号和扫描丝位置的功能。实验结果表明:该数据采集系统可以满足SHINE丝扫描截面测量系统的运行要求。展开更多
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 ...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.展开更多
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 sche...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.展开更多
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 chos...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.展开更多
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 r...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.展开更多
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 detec...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.展开更多
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 Vir...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.展开更多
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...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.展开更多
文摘针对自由电子激光装置(Free Electron Laser,FEL)对束流位置测量的需求,研制了可同时用于条带束流位置检测器(Stripline Beam Position Monitor,SBPM)和腔式束流位置检测器(Cavity Beam Position Monitor,CBPM)信号处理的数字化束流位置信号处理器(Digital Beam Position Measurement processor,DBPM)。该处理器为一体化的嵌入式结构,以现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)为系统核心,采用分布式的实验物理及工业控制系统(Experiment Physics and Industrial Control System,EPICS)进行远程数据交互。处理器对SBPM和CBPM系统的测试分辨率在0.5 n C流强时分别达到4μm和0.4μm,达到设计指标,成功应用于大连相干光源(Dalian Coherent Light Source,DCLS),并将应用于上海软X射线自由电子激光装置(Shanghai X-ray Free Electron Laser,SXFEL),是国内首台自主研制成功并实现工程应用的DBPM处理器。
基金Supported by Shanghai Synchrotron Radiation Facility project
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.
文摘上海高重复频率硬X射线自由电子激光装置(Shanghai HIgh repetition rate XFEL aNd Extreme light facility,SHINE)使用低温超导高频腔加速电子,电子能量可以到达8 GeV。对于SHINE的电子束团横向截面测量将使用丝扫描这种半拦截式的截面测量方法,产生的次级粒子数量较拦截式测量方法(如截面靶小)可以减小超导腔失超的风险,但需要实现束损探测器的信号与电机位置同步采集。本文基于Zynq-UltraScale+型片上系统设计与实现了丝扫描系统数据采集系统,首先对该数据采集系统的实现方式作了详细描述,然后利用实验平台检验了电机位置测量的正确性,并验证了同步采集探测器信号和扫描丝位置的功能。实验结果表明:该数据采集系统可以满足SHINE丝扫描截面测量系统的运行要求。
基金Supported by 100 Talents Programme of The Chinese Academy of Sciences
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.
基金Supported by 100 Talents Program of The Chinese Academy of Sciences
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.
基金Supported by National Natural Science Foundation of China (No.11075198)
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.
基金Supported by National Natural Science Foundaion of China(No.11075198)
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.
基金Supported by Knowledge Innovation Program of The Chinese Academy of Sciences (KJCX2-YW-N27)the National Natural Science Foundation of China (10875119)100 Talents Program of The Chinese Academy of Sciences
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.
基金Supported by the Knowledge Innovation Program of Chinese Academy of Science (KJCX2-YW-N27)the National Natural Science Foundation of China(10875119),and the 100-Talents Program of CAS
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.
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.
