Development of the bunch-by-bunch beam current acquisition system at SSRF

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.     

Lattice design and optimization of the SSRF storage ring with super-bends

In the near future,the Phase-Ⅱ beamline project of Shanghai Synchrotron Radiation Facility(SSRF)will be implemented and some dipoles in the storage ring will be replaced by high field dipoles(super-bend),so as to leave room for short straight sections.In this way,the brightness of the hard x-ray emitted from the super-bends can be enhanced,and more insertion devices can be installed.In this paper,super-bends of two lengths are discussed and the corresponding lattices are presented.     

SSRF磁测数据管理与应用软件系统的开发

介绍了上海同步辐射装置即上海光源工程(简称SSRF)磁测数据的管理与应用软件系统的研发情况。     

Orbit correction algorithm for SSRF fast orbit feedback system

A fast orbit feedback system is designed at SSRF to suppress beam orbit disturbance within sub-micron in the bandwidth up to 100 Hz.The SVD (Singular value decomposition) algorithm is applied to calculate the inverse response matrix in global orbit correction.The number of singular eigenvalues will influence orbit noise suppression and corrector strengths.The method to choose singular eigenvalue rejection threshold is studied in this paper,and the simulation and experiment results are also presented.     

Ultrahard X-ray multifunctional application beamline at the SSRF

The ultrahard X-ray multifunctional application beamline(BL12SW)is a phase-Ⅱ beamline project at the Shanghai Syn-chrotron Radiation Facility.The primary X-ray techniques used at the beamline are high-energy X-ray diffraction and imaging using white and monochromatic light.The main scientific objectives of ultrahard X-ray beamlines are focused on two research areas.One is the study of the structural properties of Earth's interior and new materials under extreme high-temperature and high-pressure conditions,and the other is the characterization of materials and processes in near-real service environments.The beamline utilizes a superconducting wiggler as the light source,with two diamond windows and SiC discs to filter out low-energy light(primarily below 30 keV)and a Cu filter assembly to control the thermal load entering the subsequent optical components.The beamline is equipped with dual monochromators.The first was a meridional bending Laue monochromator cooled by liquid nitrogen,achieving a full-energy coverage of 30-162 keV.The second was a sagittal bending Laue monochromator installed in an external building,providing a focused beam in the horizontal direction with an energy range of 60-120 keV.There were four experimental hutches:two large-volume press experimental hutches(LVP1 and LVP2)and two engineering material experimental hutches(ENG1 and ENG2).Each hutch was equipped with various near-real service conditions to satisfy different requirements.For example,LVP1 and LVP2 were equipped with a 200-ton DDIA press and a 2000-ton dual-mode(DDIA and Kawai)press,respectively.ENG1 and ENG2 provide in situ tensile,creep,and fatigue tests as well as high-temperature conditions.Since June 2023,the BL12SW has been in trial operation.It is expected to officially open to users by early 2024.     

上海光源同步光监测系统第一面萃取镜设计

本文介绍了上海光源(SSRF)同步光监测系统第一面萃取镜的设计.设计要求从同步光中尽可能不失真地分离出可见光.设计难点在于同步光中的高能X射线会致使萃取器件发热灼损,产生形变,影响可见光成分的波前和幅度.我们通过对同步光的功率谱分析和基于ANSYS程序的受热形变分析,设计出一面带水冷系统的铍镜用以反射可见光和透射X射线,以满足设计要求.     

基于DeviceNet的设备级控制

预制研究中的上海同步辐射装置控制系统是一个基于Ethernet和DeviceNet现场总线的分布式系统 ,设备级控制是建立该系统的重点和难点之一。本文介绍采用DeviceNet接口的设备控制器的研制及其软硬件结构 ,并给出在磁铁电源控制中的应用实例。联机测试结果表明模拟量设定及回读精度优于 3× 10 - 5。     

Optimization and comparison of accelerating cavities for the SSRF

The two kinds of cavities commolny used,the nose-coned and the bell-shaped cavities,are investigated for the RF cavity optimum design of the SSRF(Shanghai Synchrotron Radiation Facility).The maximum shunt impedance available for the former is about 45% higher than for the latter,and the latter has the stronger HOM(High order modes).     

SSRF数字化电源巡检系统的设计

开发了SSRF数字电源巡检系统,实现远程巡检与本地巡检两种模式,采用LabVIEW软件开发平台设计了简单美观的用户界面,两种硬件结构在数字化电源巡检用户软件界面上不需修改.远程巡检用于模拟数字化电源与中央控制室间远程监控通讯的调试,及时排查远程通讯或电源的故障;本地巡检可同时检测18台数字化电源,长期(24 h)进行故障状态监视,并通过Excel或text记录与保存,进行电源性能指标验收.两种巡检模式已用于SSRF的数字化电源巡检.     

SSRF-X射线小角散射实验站数据采集系统

采用LabVIEW对上海光源(SSRF)X射线小角散射(SAXS)实验站数据采集系统进行了设计,实现了对气体探测器和电离室的电子学系统实验参数设置、实验数据采集和实验结果的保存功能.经实验测试,证实了该系统的正确性和完整性.     

上海光源全局束流诊断数据仓库开发

上海光源已建成的束流诊断系统可满足光源的日常运行和机器研究需要。但由于缺少有效的事件触发处理机制,无法保存并分析运行期间突发的全局轨道扰动、BPM故障和DCCT噪声等异常现象。为解决以上问题,本文在现有束测系统的基础上开发了基于Soft IOC的全局束流诊断数据仓库。数据仓库通过在线监测加速器和束测系统的运行状况,在发现异常现象时及时发出触发信号并存储相关数据进行分析。运行结果表明,数据仓库能有效检测加速器和束测系统异常,并可用于生成束测设备置信度指标,为进一步优化束测系统和提高光源运行性能提供有效依据。     

上海光源工艺冷却水系统加热器设计

介绍了上海光源(SSRF)工艺冷却水系统加热器的选择和设计方法,加热器发热量的计算和加热器变压器的连接方式选择.说明了控制电加热的方法和电加热使用后对系统稳定的作用.     

A preliminary clinic dosimetry study for synchrotron radiation therapy at SSRF

Synchrotron radiation （SR） represents a unique and innovative anti-cancer treatment due to its unique physical features, including high flux density, and tunable and collimated radiation generation. The aim of this work is to assess the dosimetric properties of SR in Shanghai Synchrotron Radiation Facility （SSRF） for potential applications to clinical radiation oncology. The experiments were performed with 34 and 50 keV X-rays on the BL13W biomedical beamline of SSRF and the 6 MV X-rays from ARTISTE linac for the dosimetry study. The percentage depth dose （PDD） and the surface dose of the SR X-rays and the 6 MV photon beams were performed in solid water phantom with Gafchromic EBT3 films. All curves are normalized to the maximum calculated dose. The depth of full dose buildup is about l0 gm deeper for the monoenergetic X-ray beams of 34 and 50 keV. The beam transmits through the phantom, with a linear attenuation coefficient. The profile in the horizontal plane shows that the dose distribution is uniform within the facula, while the vertical profile shows a Gaussian distribution of the dose. The pemlmbra is less than 0.2 mm in the horizontal profile. Gafchromic EBT film may be a useful and convenient tool for dose measurement and quality control for the high space and density resolution. It is therefore important to gain a thorough understanding about the physical features of SR before this novel technology can be applied to clinical practice.     

上海同步辐射光源工作点稳定性研究

上海同步辐射光源（SSRF）是一台第3代高性能同步辐射装置,已稳定运行超过10年。储存环的线性光学模型稳定是光源稳定运行的基础。工作点反馈系统可实时地校正工作点,并间接地以降维的方式反馈难以在线测量到的线性光学函数。工作点反馈系统在SSRF的稳定运行验证了此方法的可行性,该反馈系统不仅使得工作点稳定度显著提升,也使得束流发射度、注入效率以及束流寿命等重要参数的稳定度得到大幅提升。衍射极限储存环光源是现阶段被广泛研究和建设的新一代同步辐射光源,工作点反馈系统也将发挥更重要的作用。本文分析电子储存环线性光学函数和工作点的稳定性,回顾SSRF工作点反馈系统的实际运行情况,介绍工作点反馈系统在SSRF衍射极限环lattice（SSRF-U）的模拟。工作点反馈在SSRF的实际运行情况和在SSRF-U的模拟结果显示,该系统可将工作点稳定在±0.001范围内,可满足储存环光源稳定运行和线性差耦合共振圆束斑模式对工作点稳定度的需求。     

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

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.     

上海光源的设备安装技术

国家重大科学工程——上海光源工程的主体是一复杂、精密的大科学装置,由成千上万、大小不一的设备组成,其中很多关键元件均应达到亚毫米量级的安装定位精度要求。在工程设计阶段,利用SolidEdge及UG等三维机械设计软件进行元件的设计及虚拟装配,避免了设备之间的相互干涉;在首批设备加工之后,实施了多次模拟安装,以查找设计缺陷,进一步对设计进行优化,为批量生产的批准提供依据;在工程安装阶段,利用激光跟踪仪、关节测量臂等三维准直测量仪器,保证设备之间0.2mm量级的安装精度,并提前3个月实现获得同步辐射光这一关键工程节点。     

Calibration method of HLS’s sensor used in SSRF

The site of Shanghai Synchrotron Radiation Facility （SSRF） is of complicated geological conditions, and a system to monitor the uneven subsidence of foundation and key parts （different kinds of magnets） of the accelerators is a necessity. Considering actual conditions of the accelerator structure and the assembling place, a new type of sensor of hydrostatic levelling system （HLS） has been designed. In order to obtain the required measurement accuracy, every HLS＇s sensor was strictly calibrated. In this paper, we introduce the special calibration method to establish the HLS. The method has been used in the calibration for vessel sensor for SSRF.     

核分析技术在基础医学研究中的若干应用

应用同步辐射Ｘ荧光微探针（ＳＲ－ＸＭＦ）和扫描质子微探针（ＳＰＭ）技术研究了基础医学领域中与微量元素有关的几个课题。初步实验结果表明，具有高灵敏度、高分辨率和对样品损伤小的ＳＲ－ＸＭＦ和ＳＰＭ技术特别适合于元素含量低的细胞和生物组织样品，这些技术是研究元素的细胞生理学，从细胞水平探讨微量元素的生物学作用机理以及从微观角度阐明疾病的致病机理等方面有独特作用的新手段。     

In-situ high-energy-resolution X-ray absorption spectroscopy for UO2 oxidation at SSRF

Based on the high-energy-resolution fluorescence spectrometer on the BL14W1 beamline at Shanghai Synchrotron Radiation Facility,an in-situ high-energyresolution X-ray absorption spectroscopy technique,with an in-situ heating cell,was developed.The high-energyresolution fluorescence detection for X-ray absorption near-edge spectroscopy (HERFD-XANES) was tested in a UO2 oxidation experiment to measure the U L3-edge,with higher signal-to-noise ratio and higher-energy-resolution than conventional XANES.The technique has potential application for in-situ study of uranium-based materials.     

同步辐射区光束线位置测量系统的控制和数据获取

介绍了上海同步辐射光源的X射线光束位置测量系统的控制和数据获取,具体描述了位置测量系统的控制和数据获取的总体设计、原理和软件系统,以及在上海同步辐射光源(SSRF)光束线线站的应用。