Conceptual design of Hefei advanced light source

The conceptual of Hefei Advanced Light Source, which is an advanced VUV and Soft X-ray source, was developed at NSRL of USTC. According to the synchrotron radiation user requirements and the trends of SR source development, some accelerator-based schemes were considered and compared; furthermore storage ring with ultra low emittance was adopted as the baseline scheme of HALS. To achieve ultra low emittance, some focusing structures were studied and optimized in the lattice design. Compromising of emittance, on-momentum and off-momentum dynamic aperture and ring scale, five bend acromat (FBA) was employed. In the preliminary design of HALS, the emittance was reduced to sub nm·rad, thus the radiation up to water window has full lateral coherence. The brilliance of undulator radiation covering several eVs to keVs range is higher than that of HLS by several orders. The HALS should be one of the most advanced synchrotron radiation light sources in the world.     

Conceptual design of Hefei Advanced Light Source (HALS) injection system

The Hefei Advanced Light Source(HALS) is a super low emittance storage ring and has a very short beam life time. In order to run the ring stablely, top-up injection will be necessary. The injection system will greatly affect the quality of beam. This article first gives a physics design of the injecting system. Then the injecting system is tracked under different errors. The responses of storage beam and injecting beam are given in the article.     

合肥先进光源储存环初步物理设计

我国最近立项建设的合肥先进光源将是一台软X射线与真空紫外衍射极限储存环光源,其电子束能量为2.2 GeV,周长为480 m,束流自然发射度为86 pm·rad,共有20个长直线节和20个短直线节。介绍了目前合肥先进光源储存环物理设计的进展情况,包括磁聚焦结构设计与优化,束流注入和集体效应的模拟与计算。     

碱类型对地聚合物混凝土应变率效应影响的对比研究

采用经波形整形技术改进后的?100 mm SHPB实验装置开展了强度等级均为C30的NS激发矿渣粉煤灰基地聚合物混凝土(NaOH and sodium silicate-activated slag and fly ash based geopolymer concrete,NSSFGC)和NN激发矿渣粉煤灰基地聚合物混凝土(NaOH and Na₂CO₃-activated slag and fly ash based geopolymer concrete,NNSFGC)的动态压缩实验,并对比分析了在冲击荷载作用下的应变率效应。结果表明:NSSFGC和NNSFGC的峰值应力均随应变率的增加而越大。这表明,GC为应变率敏感材料;在动态压缩状态下,NSSFGC和NNSFGC的应变率敏感阈值分别为51.82、28.89 s-1;GC的应变率敏感性强于普通混凝土;NN型激发剂更有利于发挥GC的整体强度特性。由此可知,NNSFGC的应变率敏感性明显强于NSSFGC。     

The magnet design for the HLS storage ring upgrade project

In order to improve the performance of the Hefei Light Source (HLS), in particular to get higher brilliance synchrotron radiation and increase the number of straight section insertion devices, an upgrade project called HLSII will be launched soon. The storage ring lattice, which has a double bend achromatic structure with four periods, comprises eight dipoles, 32 quadrupoles and 32 combined function sextupoles. The design and analysis of the magnets are shown in this paper, along with the optimization of the multipurpose combined function magnet, which consists of three magnets: skew quadrupole, horizontal dipole and vertical dipole, with the main sextupole magnet. This type of magnet is the first one that has been designed and used in China. The mechanical design and fabrication procedures for the magnets are also presented.     

LAMOST光纤定位单元定位精度检测技术研究

对 L AMOST光纤定位系统光纤定位单元提出了单元定位精度非接触检测的装置。检测装置采用面阵CCD传感器 ,通过检测光纤端部出射光斑的特征点以表征定位单元上光纤端部位置。检测算法采用灰度加权平均法 ,可以达到亚像素级的检测精度。介绍了提高检测精度的主要措施 ,装置选用白光照明 ,对所采集的图像采用多次平均的方法 ,提高了装置的稳定性。     

合肥电子储存环基本参数的测量

 为了给改造后的合肥储存环留下参考数据,同时为了找到储存环存在的物理问题,储存环特性参数首次被系统测量,它们是动量扩张因子、色散函数、自然色品、校正色品和中心频率。     

On Primitive Idempotents of the Strong Endomorphism Monoid of a Graph

51.IntroductionandPreIiminariesThemonoidofendomorphismsofagraph,inparticular,thatofstrongendomorphismsofagraph,hasbeentheobjectofresearchesinthetheoryofsemigroupsforquitesometime(cf.Llj-Lloj).LlJandL2jcanserveasasurvey.Theaimoftheseresearchesistocon-tributetothealgebraicanalysisofgraphs.Thesubjectyieldssomeinterestsincetheresultsoftheseresearchesmayopenvastpossibilitiesforapplicationsofsemigrouptheorytographtheo-ry.InL1]andL3j,ithasbeenprovedthatforfinitegraphG,sEnd(G),themonoidofstrongen…     

前言

第九届加速器物理学术交流会于2005年8月20日至28日在云南省丽江市召开,会议由中国物理学会和中国核学会下属粒子加速器分会的加速器物理专业组主办,同步辐射专业委员会光源专业组协办,清华大学和中国科学院高能物理研究所共同承办。来自清华大学、中国科学院高能物理研究所、中国科技大学、北京大学、     

客观赋权法指导下的部分权重信息多属性决策方法研究

提出了一种客观赋权法指导下的部分权重信息的多属性决策方法 ,该方法将决策者主观给出的部分权重信息和客观实际相结合 ,既充分利用了客观信息 ,又以最小偏差的形式尽可能满足决策者的主观愿望 ,达到两者的统一 .最后通过具体的应用实例验证了该模型的可行性 .