基于PC的光学速管色散段磁极间隙调节系统

描述了合肥国家同步辐射实验室光学速调管色散段磁极间隙调节系统的原理和结构。该调节系统已 ＮＳＲＬ的储存环自由电子激光实验中，效果良好，调节精度可高达１０＾－３ｍｍ。     

基于PC的光学速调管色散段磁极间隙调节系统

描述了合肥国家同步辐射实验室（ＮＳＲＬ）光学速调管色散段磁极间隙调节系统的原理和结构。该调节系统已应用在ＮＳＲＬ的储存环自由电子激光实验中,效果良好,调节精度可高达１０－３ｍｍ。     

NSRL储存环相干谐波自由电子激光实验总体布局

国家同步辐射实验室(NSRL)正在开展储存环相干谐波自由电子激光研究,目标是获得266nm相干辐射输出,并且获得较高的相干增强因子。给出实验的总体布局,包括电子束、种子激光及光学速调管的性能,介绍了种子激光扫描聚焦系统、同步系统、光学速调管磁极间隙控制系统、磁场测量系统及辐射测量系统。     

相干谐波辐射实验的测量和控制系统

电子束和种子激光一同通过光学速调管时,产生相干谐波辐射,这是获得短长波相干光的一种很有希望的途径。为产生相干辐射,光学速调管波荡器磁极间隙,种子激光波长和电子能量三者必须满足共振条件,电子束团和种子激光脉冲在时间上必须严格同步。为使某次相干谐波辐射达到极大值,光学速调色散段磁极间隙必须调节,介绍了相干谐波辐射的测量、种子激光与电子束的同步和光学速调管极间隙调节系统。     

NSRL电子储存环新RFKO系统

介绍了合肥国家同步辐射室（NSRL）最新研制的电子储存环高频剔除（RFKO）系统的原理、结构和实验结果。利用RFKO系统能够对NSRL电子储存环的填充模式进行远程数控调节，实现实验所需的各种束团分布模式。     

一种调节温升引起的紧凑型回旋加速器等时场变化的方法及其线圈绝缘实验研究

在紧凑型、小磁极间隙回旋加速器中，对等时性磁场要求较高，如中国原子能科学研究院正在设计建造的100MeV紧凑型强流回旋加速器。因其磁极间隙小，故此对于加速器运行过程中温升、电磁力等因素引起的磁极形变相当敏感，此时需在线调节等时性磁场，以保证粒子的正常加速。     

合肥光源储存环新高频控制系统

合肥光源储存环新高频控制系统是一基于EPICS(ExperimentPhysicsandIndustrialControlSystem)的分布式控制系统。本文描述了其硬件结构、软件设计及测试结果。一年多的运行表明，该控制系统能很好地满足与高频系统相关的机器研究和运行的需要。     

锁相法测量BEPC储存环自由振荡频率

BEPC储存环自由振荡频率测量系统包括前端电子学系统，测量系统和激励系统。介绍了采用锁相法的BEPC储存环自由振荡频率测量系统。     

用于NSRL电子储存环束流损失监测的数据采集系统

介绍了NSRL电子储存环束流损失监测系统的分布式数据采集系统构成，并详细介绍了其中的下位机结构，计数器设计以及CAN BUS总线等技术研究。     

上海光源储存环束流轨道联锁系统升级

针对上海光源机器故障分析的需求,对原有储存环束流轨道联锁系统进行升级,实现对储存环束流位置测量系统中140台束流位置监测器(Beam Position Monitor,BPM)电子学输出的联锁信号进行标记,同时锁存丟束过程中所有BPM电子学中的逐圈轨道数据。联锁信号的处理与锁存触发信号的输出在FPGA(Field Programmable Gate Array)内完成。该系统集成至储存环的物理实验与工业控制系统(Experimental Physics and Industrial Control System,EPICS)控制系统之中。束流检测实验表明,该系统能够准确区分不同BPM电子学输出的联锁信号,同时锁存丟束时逐圈轨道数据,并通过该系统观测到了储存环束流丢失过程中的逐圈轨道变化。     

上海同步辐射装置平移长线圈磁测机的研制

描述了上海同步辐射装置(SSRF)平移长线圈磁测机的设计和制造。磁测机包括的硬件主要有：测量线圈、直线运动平台、高精度数字积分仪、步进电机控制卡、高稳定度电源、直流电流传感器、6位半数字电压表、通用接口总线(GPIB)接口卡及高精度编码器等。磁场测量和数据分析程序采用LabVIEW编制。该磁测机已测量了SSRF储存环二极磁铁的样机，效果良好，能做到灵活、快速和自动化地测量积分场。     

Development of the bunch-by-bunch beam position acquisition system based on BEEcube

In this paper, we report the development of a bunch-by-bunch beam position acquisition system.Through a wideband synthesizer of PLL, the system realizes synchronous clock of bunch signal. Based on the highperformance FPGA hardware DAQ environment, fourchannel raw data of beam signal can be achieved. Test results in the SSRF storage ring show that the system can obtain beam position of single bunch with the resolution of10 lm and multi-bunch instability can be observed.     

合肥光源新型数字校正铁电源系统

储存环校正铁电源系统的稳定性是进行同步辐射光源束流轨道校正的重要前提。本文描述了新的校正铁数字控制电源系统硬件结构、软件设计及调试结果,其中,重点介绍了数字化控制器的硬件结构和软件工作流程。数字化控制器包括DSP卡和ADC卡,采用了DSP和FPGA作为控制核心,通过光纤与远程IOC进行实时通讯,通过本地PC机串行口可设置电源回路参数。运行结果表明,新的数字控制开关电源系统很好地满足了轨道稳定性对其的要求。     

合肥光源储存环控制系统

合肥光源储存环控制系统是一个基于EPICS(Experiment Physics and Industrial Control System)的分布式控制系统,本文首先描述其硬件结构、软件设计,然后重点介绍束流慢加速、束流闭轨校正、机器状态在线查询、数据存档及历史数据查询等应用软件的开发。运行结果表明,合肥光源储存环控制系统很好地满足了机器运行和机器研究的需要。     

Pneumatically-Driven Fast Closing Valve System for Synchrotron Radiation Sources

A fast closing valve (FCV) system has been built to protect the vacuum of the electron storage ring against sudden vacuum failures during synchrotron radiation experiments. An electronic control detects the failure, and closes a 140 × 17 mm aperture within 32 ms with a guillotine blade driven by pneumatic pressure. This pressure is gated by a magnetic valve which is operated by an explosive charge from a capacitor bank. The design of the FCV itself is very simple; it is operated directly by a single pneumatic piston. The FCV system has a long operating lifetime and the blade can be readily rearmed in 0.5 s.     

BEPCⅡ中束流位置测量系统的噪声分析

超低发射度光源要求束流位置测量系统(BPM系统)的分辨率达到亚μm量级。在实验室条件下,BPM系统电子学的测量分辨率可达亚μm,但在线机器运行时束流位置监测器（BPM）探头受到的机械振动（亚μm量级）将成为限制BPM系统测量分辨率达到亚μm的重要因素。为满足高能光源（HEPS）对BPM系统0.1 μm分辨率的要求,本文基于北京正负电子对撞机重大改造工程（BEPCⅡ）上的BPM系统,进行了功率谱方法的环境振动及束流数据的联合分析,以探究影响BPM系统分辨率的因素。首先从BPM系统分辨率的传统衡量标准与功率谱的关系出发,进而分析BPM系统的工作原理、安装环境,测量其周边的机械振动水平,获取束流的低频频谱。获取的BPM数据频谱成分及分析结果表明：电缆传输会产生频谱基线的上升;BPM探头真空室会直接受环境振动的影响;四极铁特征频率的机械振动经束流动力学造成了全环BPM数据特定频率的峰值增长。结合束流动力学,使用有限数量的BPM数据可推断出振动源点。     

Touschek lifetime study based on the precise bunch-by-bunch BCM system at SSRF

Continuous tracking of bunch charges is the key to maintain stable operations in a storage ring in top-up mode. Recently, a precise bunch-by-bunch beam-current measurement(BCM) system has been developed at the Shanghai Synchrotron Radiation Facility. To avoid the influence of longitudinal oscillation on the amplitudes of the sampling points, a method called two-point equilibrium sampling is introduced. The results, obtained during routine operation time, show that the relative resolution of the measurement of the bunch charges is better than 0.02%.With this high resolution, the new BCM system is able to monitor the bunch-by-bunch beam lifetime. By using the filling pattern information, the Touschek lifetime and the vacuum lifetime can also be calculated. In this paper, the principle of the new method and the experiments is presented in detail.     

Calibration of the linear optics in the SSRF storage ring

Phase Ⅰ commissioning of the SSRF storage ring at 3.0 GeV was ended with encouraging results. Distortions and calibrations of the linear optics during the storage ring commissioning are discussed in this paper. The calibration procedure has reduced sextupole-additional focusing effects by minimizing closed orbit deviation and corrected quadrupole magnetic coefficients with the linear optics from closed orbit (LOCO) technique. After fitting the closed orbit response matrix, linear optics of the storage ring is substantially corrected, and the measured parameters agree well with the design. Four optics modes were commissioned, and relevant machine physics studies were carried out. Their results are summarized.