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。     

冲击磁铁误差对注入过程的影响

简要说明合肥同步辐射光源（ＨＬＳ）的储存环新注入系统,分析由于冲击磁铁的误差而产生的非理想凸轨以及对注入过程的影响。针对ＨＬＳ的三种运行模式进行计算机模拟,从而确定冲击磁铁的误差极限。     

快速冲击磁铁系统的研制

合肥同步辐射光源（Hcfci Synchrotron light sourcc,HLS)的某些实验需要长时间间隔同步辐射（Synchrotronradiation)光脉冲，但是目前HLS还不能满足这些要求。因此提出在HLS储存环上采用局部凸轨的方法来延长SR光脉冲的时间间隔。为此设计了快速冲击磁铁系统，其中脉冲调制器采用脉冲成型线(Pulse Forming Line）技术设计；冲击磁铁为空芯电流板结构的磁铁。初步实验表明，快速冲击磁铁系统的设计符合实验要求。     

BSRF 3W1高功率扭摆磁铁光束线真空控制保护系统的设计

本真空控制保护系统是为北京同步辐射装置（BSRF）上的3W1高功率（总功率为2.54W）扭摆磁铁（Wiggler)光束线（包括前端区、3W1A和3W1B）而设计和建造的。主要建造目的是,保护北京正负电子对撞机（BEPC）电子储存环的超高真空系统和其它光束线不要受到在某一条光束线上突然发生的灾难性真空事故的破坏,以及保护无水冷却和冷却水意外中断了的光束线部件不要被扭摆磁铁发射出来的高功率同步辐射所损坏。此外,在活动水冷挡光罩关闭之前,为了防止快速阀的阀板因过热而被损坏,在快速阀中使用了一种熔点温度为1680℃的钛合金阀板。为了给扭摆磁铁光束线提供一个可靠的真空控制保护系统,系统设计是以F1－60MR型可编程序控制器（PLC）为基础的,PLC负责管理系统的状态监测、真空联锁、控制、自动记录和故障报警等。本文叙述了系统的设计。     

涡流板型切割磁铁半正弦波脉冲电源预制研究

预研中的上海同步辐射光源需要为其涡流板型切割磁铁提供幅度高达10kA的半正弦波脉冲电流和相对较窄的脉冲宽度（约60μs)，并且光源需要此脉冲电源具有优良的性能，尤其是输出脉冲电流幅度稳定度和调节范围。为便于维护，将脉冲电源置于电源厅内，经RG220／U高频高压同轴电缆和切割磁铁相连。本文介绍该脉冲电源的设计和研制结果。     

四极磁铁比较测量

为了提供35块四极磁铁在800 MeV电子储存环上的编组排列的数据,研制了一台称为“四极铁比较测量”的测量系统。文章描写了该系统的测量原理和方法,并且给出了测量结果,最后对测量结果的误差进行了讨论。     

零空间色散90°偏转双磁铁系统

用矩阵法分析了双磁铁９０°偏转系统的传输特性，推导了零空间色散关系式。具体设计表明该系统具有良好的聚焦、色散特性，结构简单，比较适合行波医用电子直线加速器的需要。     

Measurement system for SSRF pulsed magnets

This paper describes the magnetic field measurement system for pulsed magnets in SSRF.The system consists of magnetic probes,analog active integrator,oscilloscope,stepper motor and a controller.An application pro- gram based on LabVIEW has been developed as main control unit.After the magnetic field mapping of a septum magnet prototype,it is verified that the test results accord with the results of theoretical calculation and computer simulation.     

用高音喇叭磁铁作的振动器

用25W高音喇叭磁铁作成一个背对背扬声器式的振动器,采用线圈长度大于磁隙长度的形式来保持拾波线圈在振动时输出电压与速度成正比。     

HLS储存环冲击磁铁铁芯材料特性和磁场研究

介绍了合肥同步辐射光源新注入系统中冲击磁铁的磁场和铁氧体磁芯设计,讨论了铁氧体材料的电磁特性,包括频谱特性、设计频率区域内的磁导率特性、损耗特性和稳定性等对冲南磁铁设计的影响。     

Design of the SSRF storage ring magnet lattice

The Shanghai Synchrotron Radiation Facility (SSRF) is a proposed 3rd generation light source with 3.5 GeV in energy. It is composed of 20 DBA celis resulting in a ring that is about 10 nm-rad in emittance and 396 m in circumference, and provides 10 straight sections of 7.24 m and other 10 straight sections of 5.0 m for the inclusion of insertion devices, injection components and RF cavities. The lattice has high flexibility, and the tunes and beta func-tions can be easily adjusted within a wide range to meet the requirements for different operation modes, including high beta mode and hybrid beta mode with and/or without dispersion in straight sections. In this paper, the results of linear optics design and dynamic aperture study are presented.     

Current status and progresses of SSRF project

The Shanghai Synchrotron Radiation Facility （SSRF）, a third generation light source, comprises a 3.5GeV electron storage ring, a full energy booster, a 150 MeV linac, and seven beamlines in Phase I of the project. Beginning at the end of 2004 with a groundbreaking ceremony, the accelerators were installed in ten months from November 2006, and were successfully tested and commissioned in the past a couple of months. On December 21, 2007, storing electron beams in the storage ring was realized, and the first synchrotron radiations were observed three days later on the front-end of Beamline BL16B of the facility. Now, it runs 3 GeV 100 mA beams with a lifetime of 8-10 hours. Meanwhile, construction of the first seven beamlines （five ID beamlines and two bending magnet beamlines） is progressing on schedule.     

Dose rate distribution of photoneutrons in an ID beamline of SSRF: simulations and measurements

Photoneutrons, emitted by means of photonuclear interactions when gas bremsstrahlung interacts with beam- line components, can be another potential radiation source needed to be considered for shielding design and dose assessment of beamline. In this paper, simulations and measurements of photoneutrons dose rate at beam- line BL09U are carried out when Shanghai Synchrotron Radiation Facility （SSRF） running at Top-up mode （3.5 GeV, 235 mA）. A geometry model is constructed for the beamline BL09U with considerations of the scattering process of the major optical components. The model is compiled into Monte Carlo simulation code FLUKA to calculate photoneutron dose distribution. Measurements of the photoneutrons dose rate were per- formed by using Environmental Neutron Monitor （ENM）. Observation points were arranged uniformly along the inside and outside of the optical enclosure （OE） of BL09U. The calculation results agree with experiments within the measurements uncertainties. It is verified that photoneutrons dose simulation is reliable. The simula- tion and measurement methods can be applied to evaluate the neutron dose level of other beamline stations, and provide references for the shielding design of the beamlines at SSRF in the near future.     

上海同步辐射装置电源控制系统

上海同步辐射装置电源控制系统是基于EPICS系统开发运行的分布式控制系统。系统中~65 K实时数据库记录分布运行于27个VME总线的IOC控制器中,实现了对600多台各类磁铁电源的访问控制。本文介绍了电源控制系统基于Ethernet的层次式结构与工作原理,分别描述了针对PSI与SINAP电源控制器的控制解决方案,同时介绍了系统的硬件设备、IOC和控制台软件及系统中采用的通讯技术。     

IK220计数卡在XAFS线站数据采集系统改造中的应用

上海同步辐射光源BL14W1 XAFS线站采用IK220高速计数卡建立了QXAFS快速扫描系统。该系统简化了原有控制系统的结构,能快速直接的读取单色器端的能量值,解决了采集过程中单色器端数据与电离室ADC端数据间的同步获取问题,成功实现了快速XAFS谱采集。改进后的系统最大限度的使用了实验站现有的硬件设备,并可在普通XAFS实验方法和QXAFS实验方法间随意转换。     

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.     

Potential application of SSRF in radiation oncology： The aspects of radiobiology

Conventional radiotherapy remains to be one of the most useful treatments for cancer, but it is not the best strategy to maximize the effects on the tumors and minimize the damage to the surrounding tissues because of its physical and radiobiological characteristics. Synchrotrons represent a unique method for an innovative anti-cancer treatment due to the physical features (i.e. high fluence, tunable and collimated) of X-ray induced by synchrotron, so photon activation therapy and microbeam radiation treatment have been developed, but it is very imperative to understand the radiobiological mechanism of synchrotron radiation before we could transfer the strategy into the clinic.This paper is to summary the results of in vitro and in vivo experiments with synchrotron radiation, and review the advances of molecular and cellular radiobiological mechanism involved in synchrotron radiation. Since Shanghai Synchrotron Radiation Facility (SSRF) has produced the first synchrotron, it will provide the unique opportunity for the study of radiobiological effects of synchrotron radiation.     

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.     

上海光源储存环光子吸收器布局设计

电子束经过储存环弯转磁铁发生偏转时,产生总功率-435 kW的同步辐射光,其中仅有一小部分被引入光束线、实验站,其余须在储存环中被光子吸收器吸收处理,并准直引出光束.本文对上海光源(SSRF0储存环同步辐射光的处理方法进行了讨论,并介绍了光子吸收器的布局、结构、性能及运行状况.