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。     

Tidal effects on hydrostatic leveling system used in high precision alignment of particle accelerator

Hydrostatic leveling system（HLS） is widely used in precision engineering survey,especially the alignment of particle accelerator,and the tidal effects on the measurement accuracy of HLS is non-ignorable.thus studies on tidal effects on the HLS is vital.A set of HLS was installed in Jingxian seismostation for verifying the methods to handle the tidal effects on the readings of HLS.Harmonic analysis of the data recorded by HLS and DSQ water tube clinometers in Jingxian seismostation and contrastive analysis of the results are completed.The tilt tide can be well reflected in the data of the both instruments and the results are both reliable.The reasons of the difference between the results are analyzed in this paper.Besides,a validation study based on the measurement data of the HLS used in SPring-8 storage ring for tidal correction on the reading of HLS is completed.The research establishes a foundation for HLS to be applied in micron-level precision alignment of particle accelerator in the future.     

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。     

静力水准系统在BEPCⅡ预准直中的应用

本工作研制静力水准系统，用于北京正负电子对撞机升级改造工程（BEPCII）储存环和其他关键部位垂直方向位移的实时监测。通过分析测量数据，确定了静力水准系统在BEPCII预准直中应用是可行的，系统的精度等技术指标符合应用要求。这些数据也为工程安装、测试提供了很好的参考。本文还介绍了静力水准系统在使用过程中的维护方法。     

用于粒子加速器位置监测的静力水准系统与线位置探测器的比对研究

本文搭建了一套由温湿度传感器、激光位移传感器、高精度位移平台组成的实验系统。采用控制变量法,分别以环境因素及位移为变量,对固定在同一位移平台的静力水准系统(HLS)与线位置探测器(WPS)进行两组实验。实验结果表明：温度是影响HLS测量精度的主要因素,通过温度补偿,可得到较为精确的结果;湿度变化改变张紧线的下垂量,从而影响WPS的测量精度。在环境稳定的情况下,WPS与HLS对同一点的测量结果差值的均方根误差最大为0.003 37 mm,在误差允许范围内,因此两者可组合使用。     

压力和温度对静力水准系统精度影响分析

静力水准系统(Hydrostatic leveling system,HLS)的工作介质是液体.由于纯净水的诸多优点,在本系统中采用水作为工作介质.液体的特性是极易受到外界的影响而改变它的物理形态.在HLS系统中,压力、温度等因素对系统的测量有着非常大的影响.本文分别分析了压力和温度对静力水准系统测量精度的影响.为了消除压力的影响,在系统设计的时候采用了密封钵体和钵体之间用等压气管连接的办法,保证系统在工作时每个钵体中的工作液体表面上的大气压是一致的.温度的影响包括水管中温度梯度的影响和钵体之间温度差异的影响.通过分析,对于水管中温度梯度的影响,只要在安装系统时保证水管的垂直高差足够小,就可以忽略;而对于钵体之间的温度差异的影响,在每个钵体传感器中都安装了温度传感器,实时地测量钵体的温度,并和CCD测量数据同时采集,通过理论计算得到温度修正公式,对每个钵体中的CCD读数进行温度修正.通过实验数据分析,可以把温度的影响修正到允许的误差范围以内.     

HLS脉冲四极磁铁注入方法设计与研究

介绍了一种采用脉冲四极磁铁实现储存环束流注入的新方法.通过物理计算和注入过程数值模拟研究,确定了储存环上安装脉冲四极磁铁的位置和强度,并通过模拟计算评估了注入过程中注入束流存活效率和对储存束流的影响,证明了在合肥光源采用脉冲四极磁铁完成束流注入过程的可行性.     

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.     

合肥光源辐射剂量监测系统

合肥光源原有的辐射监测系统是为衰减运行模式而设计建造的。为了更好地促进用户实验的科研产出,合肥光源正在进行恒流运行关键系统改造。在改造中,为了保障实验人员和设备的安全,根据恒流运行要求增加了辐射剂量监测点和完善了安全联锁功能。系统基于EPICS开发,由探测器、通讯模块、数据采集监测软件、数据分析系统等组成。该系统既能监测光源区及周边的辐射剂量率水平,还具备计算积分剂量、历史剂量查询以及必要的安全联锁等功能。新系统已经运行三个多月,系统稳定可靠,能很好地满足合肥光源恒流运行模式对辐射监测的要求。     

合肥光源超导扭摆磁铁模式下线性光学参数补偿

合肥光源是1台专用真空紫外光源，为拓展同步辐射用户可用光范围，在储存环上安装了1台6T的超导扭摆磁铁。超导扭摆磁铁给储存环光学参数带来很大扰动，造成工作点漂移和β函数畸变。最初，在补偿工作点漂移后，成功地存储了束流并产生了硬X射线，但该运行模式下束流寿命短，严重影响其它实验线站的实验工作。在合肥光源二期工程中，重新进行了超导扭摆磁铁补偿计算，在不改变目前储存环磁铁和电源的基础上，同时补偿工作点漂移和β函数畸变，大幅度地改善了束流寿命。     

Simulation of storage ring injection of HLS Ⅱ

The Hefei light source(HLS) has been upgraded into HLS II, with increased brightness and stability. In this paper, the new injection system is described. Elegant program is used to simulate the particles motion in 6D phase space. In the process of tracking simulation of electrons, the system tolerances and magnet errors are introduced. Influences to the injection efficiency from beam injection deviation are studied. These provide important reference for realizing the Top-up injection.     

合肥光源注入过程中束流负载效应和束流强度限制

根据储存环高频系统束流负载理论，研究计算了合肥光源注入过程中高频系统的大失谐角工作模式和调谐工作模式。综合考虑两种模式利弊，给出了更为灵活的注入模式。对于合肥光源，只要新高频系统参数设置合理，束流可顺利注入积累到设计值300mA以上。     

Temporal characteristic analysis of single event effects in pulse width modulator

In this paper,the nature and origin of single event effects (SEE) are studied by injecting laser pulses into different circuit blocks,combining with analysis to map pulse width modulators circuitry in the microchip die.A time-domain error-identification method is used in the temporal characteristic analysis of SEE.SEE signatures of different injection times are compared.More serious SEE are observed when the laser shot occurs on a rising edge of the device output for blocks of the error amplifier,current sense comparator,and T and SR latches.     

合肥光源的工作点测量系统

合肥 8 0 0MeV电子储存环的工作点测量系统采用扫频激励法进行工作点测量 ,它由条带束流位置检测器、180 0 的魔T、混频器、带扫频信号输出的频谱分析仪、功率放大器和束流激励电极等构成。该系统的测量精度约为 1× 10 4 。利用该系统进行了机器的校正色品测量 ,给出了工作点和色品的测量结果。     

HLS储存环慢加速过程的软件控制研究

合肥同步辐射光源(Hefei light source,HLS)电子储存环为非满能量注入,束流以200MeV的能量注入到储存环内。当积累到一定流强后,要进行慢加速(Ramping)。本文首先介绍慢加速过程控制的原理和方法,然后介绍如何采用Elegant软件建立储存环的物理模型。对于横向运动,根据慢加速过程中工作点、色品等的变化对Lattice参数进行调整;对于纵向运行,对慢加速步长和高频系统进行调整。     

Turn-by-turn system and its primary experiment at HLS

During the Phase II project of NSRL, a turn by turn BPM (Beam Position Monitor) system is proposed for storage ring diagnostics which engages log-ratio electronics circuit to measure machine properties of the HLS (Hefei Light Source) storage ring. The log-ratio processor works at 408 MHz, twice the RF frequency of HLS. Modern logarithmic amplifiers with wide dynamic range, great bandwidth, good logarithmic conformance, and low cost are attractive for beam position measurements. Injection kicker and the stripline-electrode resonant exciting methods are used to excite beam for nonlinear beam dynamics and phase space studies of stored beam. Up to 2 seconds of data acquisition is ensured. In this paper we present the performance of each component and preliminary test results of the turn-by-turn BPM system.     

Measurement and Research of Beam-Based Alignment With AC k-Modulation at HLS

A new beam-based alignment (BBA) measurement system with AC k-modulation module was developed recently at Hefei Light Source (HLS), which equipped the quadrupole magnets on the storage ring with a current shunt system which was able to vary the magnet current of a given quadrupole at a given frequency. The corresponding closed orbit oscillation amplitude measured for different beam positions in the quadrupole reached a minimum when the beam was centered in the quadrupole. Amplitude estimation algorithms of software lock-in amplifier and interpolated FFT were discussed. A V-shaped curve was used to determine the offset; a method using a parabola fit to determine the offset was also discussed. This BPM-to-quadrupole offset was determined at HLS with an accuracy of ~50 mum. The reproducibility of the beam based alignment using this technique is about 20 mum (RMS)     

50MW速调管脉冲调制器的PLC控制

介绍了合肥同步辐射光源(HLS)50MW大功率速调管脉冲调制器改造项目。在该项目中,采用可编程控制器(PLC)监控系统取代了原有的基于继电器逻辑电路的监控系统,使其成为HLS基于先进的控制软件EPICS的新控制系统的一部分;采用恒流逆变充电电源取代了原来的工频高压电源,使调制器技术更先进、运行更加可靠。本文给出了调制器PLC控制系统的设计方法和软硬件的实现及运行情况。     

Beam instrumentation and diagnostics for HLS

The beam diagnostic instrumentation for the Heifei Light Source(HLS) is described ,It provides sufficient parameters for machine study during the commisioning and common operation.The measured results are presented.     

Development of a PSD-based photon beam position measurement system

As an important part of the beam diagnostic system, the synchrotron light beam position measurement has a very high value in the high quality and high stability light source applied research. A new photon beam position monitor based on position-sensitive detector (PSD) has been developed to measure the photon beam position in vertical and horizontal directions at the same time at HLS (Hefei Light Source). The new PBPM based on the PSD has fast response speed, high sensitivity and wide dynamic range. This PBPM system also includes the C4674 signal processing circuit, NI USB-9215 data acquisition device and the LABVIEW data acquisition program. This PBPM system has been calibrated vertically and horizontally on-line, and then has been applied in the beam line B3EA of HLS to measure the position of the synchrotron light. As the results shown, the resolution of the system is better than 3 mm.