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Design study of charge-stripping scheme of heavy ion beams for HIAF-BRing

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Nuclear Science and Techniques 2024年第5期35卷 30-41页

作者： Jun-Jie zhang Zhi-You Xu Jin-Quan zhang Wen-Wen Ge Liang-Ting Sun Huan-Yu Zhao institute of Modern physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Charge strippers play an essential role in heavy-ion accelerators by stripping the projectile ions to higher charge states to enhance the acceleration efficiency downstream of the *** the high-energy mode of the booster ring(BRing)of the high-intensity heavy-ion accelerator facility,the pre-accelerated ions from the iLinac will be stripped by a carbon foil to higher charge states and then injected into the *** key parameters of the stripper and stripped ions were calculated,and the influence of stripping on the beam quality was *** get high stripping efficiencies,the foil thicknesses and resultant charge state distributions for the typical ions were determined by the code *** equilibrium thickness was obtained for the U beam,while the stripper thicknesses for the Xe and Kr beams were determined based on a compromise between the stripped charge states and the stripping *** energy loss,energy straggling,and emittance growth due to stripping have a non-negligible impact on the transport of the stripped beams and the injection of the ***,these parameters were simulated by *** addition,the foil’s temperature evolution,which greatly affects the foil lifetime,was simulated by *** maximum temperature of the foil bombarded by the U and Xe beams with the nominal parameters will exceed the safe value in terms of the impact of evaporation on the foil’s *** the foil temperature constraint,the highest tolerable beam intensity and the injected ion number into the ring were derived for different beam *** results of this paper will present important reference data for the optimization design and commissioning of the beamline and injection to the BRing for the stripped ions.

关键词： high-intensity heavy-ion accelerator facility Charge stripper energy spread Thermal analysis Emittance growth Injection turns

锕系配合物中Van der Waals能与配位键能之间的平衡Ⅰ.

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化学学报 1987年第1期45卷 65-67页

作者：冯锡璋中国科学院高能物理研究所应用部北京

引言本文通过分析一些弱键化合物,如锕系配合物中配位键能与Van der Waals能之间的平衡,得出配位键能与配位原子间的Van der Waals最大吸引能相近的结果。这是对堆积模型的一个有力支持,并将成为进一步发展该模型之基础。在一些弱键化... 详细信息

引言本文通过分析一些弱键化合物,如锕系配合物中配位键能与Van der Waals能之间的平衡,得出配位键能与配位原子间的Van der Waals最大吸引能相近的结果。这是对堆积模型的一个有力支持,并将成为进一步发展该模型之基础。在一些弱键化合物,如锕系与镧系配合物中,配位键能与Van der Waals能之间的平衡导致配位原子的“饱和堆积”和“均匀堆积”,并且这些包含在堆积模型中的堆积特性已在分析大量国内外文献的实验数据中得到证实。

关键词：配位键 Van der Waals 配位原子弱键锕系键长原子配位键能实验数据镧系

Operando measurement of lattice deformation profiles of synchrotron radiation monochromator

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Nuclear Science and Techniques 2024年第7期35卷 8-19页

作者： Yue zhang Zhong-Liang Li Shang-Yu Si Lian Xue Hong-Xin Luo Xiao-Wei zhang Jun Hu Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201204China ShanghaiTech University Shanghai201210China University of the Chinese Academy of Sciences Beijing100049China beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of ScienceBeijing100049China

This study presents a new method for characterizing the thermal lattice deformation of a monochromator with high precision under service conditions and first reports the operando measurements of nanoscale thermal lattice deformation on a double-crystal monochromator at different incident *** nanoscale thermal lattice deformation of the monochromator first crystal was obtained by analyzing the intensity of the distorted DuMond *** diagrams of the 3.3.diffraction index,sensitive to lattice deformation,were obtained directly using a 2D detector and an analyzer crystal orthogonal to the *** increasing incident power and power density,the maximum height of the lattice deformation increased from 3.2 to 18.5 nm,and the deformation coefficient of the maximum height increased from 1.1 to 3.2 nm/*** maximum relative standard deviation was 4.2%,and the maximum standard deviation was 0.1 *** on the measured thermal deformations,the flux saturation phenomenon and critical point for the linear operation of the monochromator were predicted with increasing incident *** study provides a simple solution to the problem of the lower precision of synchrotron radiation monochromator characterizations compared to simulations.

关键词： Synchrotron radiation Monochromator Lattice deformation X-ray dynamic diffraction

Neutron activation analysis and Mdssbauer spectroscopy research on coloring mechanism of ancient Chinese Guan porcelain

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Chinese Science Bulletin 2000年第20期45卷 1840-1844页

作者： ZHAO Weijuan, LI Guoxia, GAO Zhengyao, zhang bin, LI Rongwu, WU Xiaoli, YAO Guifang, JIA Xiuqin, HAN Song & HUANG Zhongxiang1. Department of physics, Zhengzhou University, Zhengzhou 450052, china 2. Department of Architecture, Zhengzhou Technology University, Zhengzhou 450002, china 3. Department of physics, beijing Normal University, beijing 100875, china 4. Hangzhou Museum of Guan kiln, Hangzhou 3.0008, china 5. institute of high energy physics, Chinese Academy of Sciences, beijing 100080, china

The content of 3. kinds of coloring elements in Guan porcelain in the Southern Song Dynasty has been determined by neutron activation analysis (NAA). Iron is the major coloring element. Mossbauer spectroscopy has shown that the iron of the glaze exists in the form of structural iron (Fe2+, Fe3.). The quantitative relationship between the main wavelength of every color glaze and the relative content (Fe2+/Fe3.) of structural iron has been determined. Thus the coloring mechanism of Guan porcelain in the Southern Song Dynasty has been revealed entirely.

关键词： coloring mechanism of Guan porcelain in Southern Song Dynasty characteristic spectrum NAA Mossbauer spectroscopy.

DISSOLUTION EQUILIBRIUM OF Mg VAPOUR IN LIQUID Fe

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Acta Metallurgica Sinica(English Letters) 1990年第9期3卷 230-233页

作者： zhang Xiaodong HAN Qiyong University of Science and Technology beijing,beijing,{3.CHEN Dong Hebei institute of Metallurgy,Shijiazhuang,{3. HAN Qiyong Professor,Dept.of physics and Chemistry,University of Science and Technology beijing,beijing 100083.{3.

The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure *** equilibrium con- stant for the reaction Mg_((g))=[Mg]and th... 详细信息

关键词： liquid Fe Mg dissolution equilibrium

INFRARED ABSORPTION BANDS OF Si-H CENTERS IN γ-RAY IRRADIATED FZSi GROWN IN HYDROGEN ATMOSPHERE AND THEIR IDENTIFICATION

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Science in china,Ser.A 1987年第2期30卷 176-185页

作者：杜永昌张玉峰孟祥提沈宏扬 Department of physics Peking University institute of Nuclear energy Technology Qinghua University institute of Atomic energy Academia Sinica beijing

Gamma-ray irradiated and neutron irradiated silicon have been stualea using the rourler transiorm inftared spectroscopy and deep-level transient spectroscopy. In γ-ray irradiated silicon the production rate of divacancy is very low, which can be used to identify radiation point defects. Only three new Si-H stretching vibration bands of 183., 2054 and 1980 cm-1 are produced in γ-ray irradiated FZ （H）Si, fewer than that in neutron irradiated FZ（H）Si. In this paper the models of the three bands are discussed and their optical absorption sections are estimated.

关键词： RAY IRRADIATED FZSi GROWN IN HYDROGEN ATMOSPHERE AND THEIR IDENTIFICATION INFRARED ABSORPTION BANDS OF Si-H CENTERS IN Si

Multidimensional hollow SiO_(2)/C nanofibers modified by magnetic nanocrystals for electromagnetic energy conversion and lithium battery storage

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Nano Research 2024年第8期17卷 7301-7314页

作者： Chen Han Qi Zheng Juncheng Jin Jiajia zhang Wen-Qiang Cao Kun Xiang Min zhang Mao-Sheng Cao Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology College of Materials and Chemical EngineeringWest Anhui UniversityLu’an 237012China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of physics Beijing Technology and Business UniversityBeijing 100048China

Multifunctional materials are powerful tools to support the advancement of energy conversion *** with prominent electromagnetic and electrochemical properties can realize the conversion of electromagnetic energy and solve the subsequent storage ***,an electrospinning-thermal reduction method is employed to construct ultrafine nickel nanoparticle modified porous SiO_(2)/C(Ni-SiO_(2)/C)hollow nanofibers as promising materials for applications in both electromagnetic wave absorption(EMA)and lithium-ion ***,when used as an EMA material,the reflection loss(RL)of Ni-SiO_(2)/C can reach−47.8 dB at 15.8 GHz with a matching thickness of 2.2 *** excellent microwave absorption performance can be attributed to the enhanced conduction loss,polarization relaxation,synergistic magnetic loss,and preferred impedance matching,which result from multi-component magnetic/dielectric synergy and the unique interconnected multidimensional hollow ***,the electronic conductivity and electrochemical activity of the samples are significantly enhanced due to the uniform distribution of ultrafine Ni nanoparticles in the amorphous SiO_(2)/C ***,the hierarchical hollow porous structure provides sufficient free space for volume change during lithiation/delithiation ***,the Ni-SiO_(2)/C nanocomposite exhibits a high reversible capacity of 917.6 mAh·g^(−1)at 0.1 A·g^(−1).At a high current density of 2 A·g^(−1),a capacity of 563.9 mAh·g^(−1)can be maintained after 3.0 *** energy conversion-storage device is designed to store waste electromagnetic energy in the form of useful electrical *** work inspires the development of high-performance bifunctional materials.

关键词： Ni-SiO_(2)/C nanofiber electromagnetic absorption lithium-ion storage electrospinning multidimensional structure

“Saturate packing and uniform packing”,structural characters in lanthanide and actinide coordination compounds

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Chinese Journal of Chemistry 1985年第3期3卷 285-289页

作者： LI Xing-Fu FENG Xi-zhang XU Ying-Ting Application Department,The institute of high {3. physics,Academia Sinica,beijing,P.O.Box 273. SUN Peng-Nian The University of Science and Technology of china,Hefei SHI Jie Petroleum School,Tian Jing University,Tianjing Application Department The Institute of High Energy Physics Academia Sinica Beijing P. O. Box 2732 The University of Science and Technology of china Hefei Petroleum School Tian Jing University Tianjing

In structural chemistry,it has been well accepted that,besides orbital interactions,geo-metrical factors *** and shape of the bonded atoms and groups,may also play ***,a quantitative study of these factors has long been *** the point that steric effects should become more remarkable in weak bond compounds,it is expected that coordination and organometallic chemistry of f-group elements,owing totheir low CFSE and high coordination numbers,and also to their poor directionality of ioniccharacter,is assumed to be an appropriate field for study on steric effects while a rapid de-

关键词： Li Saturate packing and uniform packing structural characters in lanthanide and actinide coordination compounds

Measurements of fast-neutron capture cross sections for 159Tb and 169Tm

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Nuclear Science and Techniques 1998年第3期 10-13页

作者： Chen Jin Xiang, Shi Zhao Min, Tang Guo You, zhang Guo Hui ( institute of Heavy Ion physics, Peking University, {3. 100871) Lu Han Lin, Han Xiao Gang and Huang Xiao Long ( china institute of Atomic energy, {3. 102413.

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关键词： Tb 169 Tm 197 Au Neutron capture cross sections Activation method