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
上海软X射线自由电子激光装置(Shanghai Soft X-ray Free Electron Laser,SXFEL)需1个分辨率达到亚μm量级的束流位置测量系统,并采用基于束流准直的方法实现波荡器段电子束与光子束的紧密重合。为此设计研制了1个由C波段腔式探头、单...上海软X射线自由电子激光装置(Shanghai Soft X-ray Free Electron Laser,SXFEL)需1个分辨率达到亚μm量级的束流位置测量系统,并采用基于束流准直的方法实现波荡器段电子束与光子束的紧密重合。为此设计研制了1个由C波段腔式探头、单路混频至低中频的射频前端以及自主研发的专用数字信号束流位置处理器(digital beam position monitor processor,DBPM)构成的腔式束流位置测量(cavity beam position monitor,CBPM)系统。本文对系统的设计、软硬件结构、系统搭建进行了介绍,并基于漂移段搭建的3个紧邻的CBPM阵列完成了在线系统性能评估。束流实验结果表明,在束团电荷量为500 pC、系统动态范围在±800μm的条件下,位置分辨率可达880 nm,这也是国内首次研制成功可在线运行的具有亚μm位置分辨率的CBPM系统。此外,采用CBPM的相位腔进行相对束团电荷量、束团到达时间的测量,其性能评估结果也均优于SXFEL设计要求。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
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
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
横向工作点是环形粒子加速器非常重要的特征参数之一,一般不随时间变化,可通过对束流逐圈位置数据做简单的谐波分析得到,但在某些特殊的物理过程中工作点会随时间变化,需要研究并优化时变工作点的算法。储存环注入后残余横向振荡阻尼衰...横向工作点是环形粒子加速器非常重要的特征参数之一,一般不随时间变化,可通过对束流逐圈位置数据做简单的谐波分析得到,但在某些特殊的物理过程中工作点会随时间变化,需要研究并优化时变工作点的算法。储存环注入后残余横向振荡阻尼衰减的过程中因Lattice的非线性效应可能会发生工作点漂移,研究时变工作点的分析算法并对上述物理过程进行分析,可以对储存环的非线性效应进行定量评估。本文首先对小波算法和基本频率的数值分析算法(Numerical Analysis of Fundamental Frequencies,NAFF)在时变工作点分析的适用性进行了分析,并比较了两种算法的性能。结果表明:两种算法均可以实现时变工作点的动态分析,但小波方法性能更好。然后采用小波方法对上海光源储存环注入期间工作点的飘移进行了定量分析,评估了上海光源不同运行周期非线性的强度变化。结果显示:其工作点的飘移在不同时期有不同的表现,总体上非线性效应有增强的趋势。展开更多
为了实现对高重频硬X射线自由电子激光装置(SHINE)条带型BPM(Beam Position Monitor)系统信号的数字化采样和处理,研制了高重频束流采集处理器原型样机。处理器拥有四通道输入,最高达1GSps的采样率,16bit采样位数,采用XILINX公司带有嵌...为了实现对高重频硬X射线自由电子激光装置(SHINE)条带型BPM(Beam Position Monitor)系统信号的数字化采样和处理,研制了高重频束流采集处理器原型样机。处理器拥有四通道输入,最高达1GSps的采样率,16bit采样位数,采用XILINX公司带有嵌入式CPU(Central Processing Unit)的ZYNQ系列FPGA(Field Programmable Gate Array),可以运行Linux系统,同时可以实现高速采样数据的缓存与读出。处理器采用子母板结构设计,子板为ADC(Analog To Digital Converter)采样板,母板为FPGA数字处理板,子母板通过FMC(FPGA Mezzanine Card)接口进行数据传输。ADC采用JESD204B协议进行数据传输,子母板间通过16对差分信号连接通道,最大总传输速率达到80Gbps。ADC采样数据传入数字母板后,经过FIFO和DDR的缓存,最后通过TCP/IP协议由RJ45接口传输到上位机进行处理和分析,RJ45接口的数据传输速率约为900Mbps。经过测试,ADC采集子板的带宽高于480MHz,且在480 MHz带宽内有效位高于10位。FPGA数字母板运行经Petalinux编译的Linux系统,可以实现对连续或者触发模式下,四通道一百万个采样点的存储与数据传输。整个设计可以满足设计要求。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。
文摘上海软X射线自由电子激光装置(Shanghai Soft X-ray Free Electron Laser,SXFEL)需1个分辨率达到亚μm量级的束流位置测量系统,并采用基于束流准直的方法实现波荡器段电子束与光子束的紧密重合。为此设计研制了1个由C波段腔式探头、单路混频至低中频的射频前端以及自主研发的专用数字信号束流位置处理器(digital beam position monitor processor,DBPM)构成的腔式束流位置测量(cavity beam position monitor,CBPM)系统。本文对系统的设计、软硬件结构、系统搭建进行了介绍,并基于漂移段搭建的3个紧邻的CBPM阵列完成了在线系统性能评估。束流实验结果表明,在束团电荷量为500 pC、系统动态范围在±800μm的条件下,位置分辨率可达880 nm,这也是国内首次研制成功可在线运行的具有亚μm位置分辨率的CBPM系统。此外,采用CBPM的相位腔进行相对束团电荷量、束团到达时间的测量,其性能评估结果也均优于SXFEL设计要求。
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 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 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.
文摘横向工作点是环形粒子加速器非常重要的特征参数之一,一般不随时间变化,可通过对束流逐圈位置数据做简单的谐波分析得到,但在某些特殊的物理过程中工作点会随时间变化,需要研究并优化时变工作点的算法。储存环注入后残余横向振荡阻尼衰减的过程中因Lattice的非线性效应可能会发生工作点漂移,研究时变工作点的分析算法并对上述物理过程进行分析,可以对储存环的非线性效应进行定量评估。本文首先对小波算法和基本频率的数值分析算法(Numerical Analysis of Fundamental Frequencies,NAFF)在时变工作点分析的适用性进行了分析,并比较了两种算法的性能。结果表明:两种算法均可以实现时变工作点的动态分析,但小波方法性能更好。然后采用小波方法对上海光源储存环注入期间工作点的飘移进行了定量分析,评估了上海光源不同运行周期非线性的强度变化。结果显示:其工作点的飘移在不同时期有不同的表现,总体上非线性效应有增强的趋势。
文摘为了实现对高重频硬X射线自由电子激光装置(SHINE)条带型BPM(Beam Position Monitor)系统信号的数字化采样和处理,研制了高重频束流采集处理器原型样机。处理器拥有四通道输入,最高达1GSps的采样率,16bit采样位数,采用XILINX公司带有嵌入式CPU(Central Processing Unit)的ZYNQ系列FPGA(Field Programmable Gate Array),可以运行Linux系统,同时可以实现高速采样数据的缓存与读出。处理器采用子母板结构设计,子板为ADC(Analog To Digital Converter)采样板,母板为FPGA数字处理板,子母板通过FMC(FPGA Mezzanine Card)接口进行数据传输。ADC采用JESD204B协议进行数据传输,子母板间通过16对差分信号连接通道,最大总传输速率达到80Gbps。ADC采样数据传入数字母板后,经过FIFO和DDR的缓存,最后通过TCP/IP协议由RJ45接口传输到上位机进行处理和分析,RJ45接口的数据传输速率约为900Mbps。经过测试,ADC采集子板的带宽高于480MHz,且在480 MHz带宽内有效位高于10位。FPGA数字母板运行经Petalinux编译的Linux系统,可以实现对连续或者触发模式下,四通道一百万个采样点的存储与数据传输。整个设计可以满足设计要求。
