最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Hui,ZHANG Shancai
        Vol. 37, Issue 9, Article number: 090101(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090101
        摘要：Background: With the development of design and construction technology in accelerator fields, high-quality beam brings challenges to beam diagnostics. Purpose: To meet the strict requirements, new beam measurement techniques have emerged. One of them is the Transverse Deflecting Structure (TDS) method that possesses advantages of versatility and high precision. This paper aims to design a TDS Structure for longitudinal measurements. Methods: Based on the work on TDS by scientists around the world, the Computer Simulation Technology-MICROWAVE STUDIO (CST-WS) software was applied to design a TDS cell structure-Disk loaded waveguide structure with two peripheral recesses matched to Hefei Light Source (HLS) parameters. Beam dynamics simulations are executed by using MATLAB and PARMELA to show the evolution of the bunch distribution in the structure, respectively. Results: Dimensions of this TDS, the field type and the resulting dispersion curve are obtained. And the impacts on the operating frequency of feature sizes are explicated. Conclusion: This structure can get the desired deflection field type. Stabilizing mode method can realize stable ~25.5 MHz frequency separation, which can be proved effective through CST simulations. Characteristic dimension b impacts the operating frequency most, and dr impacts changes most for different polarization modes. MATLAB and PARMELA simulation are consistent. Abstract  
        关键词：Transverse Deflecting Structure (TDS);Disk loaded waveguide;HEM11;MATLAB;Parmela   
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        发布时间：2021-03-03
      • ZHU Zhouxia,GONG Peirong
        Vol. 37, Issue 9, Article number: 090102(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090102
        摘要：Background: Shanghai Synchrotron Radiation Facility (SSRF) is one of the third generation synchrotron radiation light sources in the world. Canted beamline which means two underlator are installed in one straight section is designed to increase the capacity of SSRF beamlines and thereof the interlock system for the canted beamline. Purpose: The aim of Canted beamline interlock system is to protect users and beamline components from the radiation of synchrotron light source, and ensure the Canted beamlines to run harmoniously. Methods: Based on Programmable Logic Controller (PLC), Canted beamline interlock system puts forward beamline arbitrary signals and two searching paths to solve a series of difficulties such as the interlock relationships of shared components and shared hutch area. Results: In case of emergency, Canted beamline interlock system closes the photon shutters or requests the storage control system to abort the stored electron beam to assure personal and beamline device safety according to preset interlock logic. Conclusion: The designed Canted beamline interlock system collaborates smoothly with other control systems and works well from July 2013 till now. The design methods presented here provides reference for the following Canted beamlines in phase-II beamlines project in the near future. Abstract  
        关键词：Front ends;Canted beamline;Safety interlock system;Programmable Logic Controller (PLC)   
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        发布时间：2021-03-03
      • HUANG Chaoqiang,YAN Guanyun,XIE Lei,SUN Liangwei,CHEN Bo,LIU Yaoguang,SHENG Liusi,LIU Xiao,WU Zhonghua
        Vol. 37, Issue 9, Article number: 090103(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090103
        摘要：Background: Understanding of helium state is important for the materials used in radiation surroundings. Most mechanical damage starts with a change in the microstructure of the material. Purpose: To study the behavior of helium in the material, a helium contained Al-B alloy Al0.4wt%B was prepared using 10B (n, α) nuclear reaction by reactor thermal neutron irradiation. The helium atoms density reached to 6.2×1025 m?3. Methods: The synchrotron small angle X-ray scattering (SAXS) was employed to study the helium state at different temperatures. The X-ray and neutron diffraction were used to inspect the lattice change. The tempered samples were observed with transmission electron microscope (TEM) to confirm the helium bubbles. Results: SAXS analysis shows the volume fraction of helium bubbles significantly increased with temperature. The radius of helium bubbles increased to about 10 nm at 700 oC, which is the similar size of scatters at room temperature. TEM results show some obvious pores and particles existed in the sample at room temperature and disappeared after 500 oC, and helium bubbles appeared increasingly with temperature. The results of SAXS and TEM are consistent. X-ray and neutron diffraction analysis show there is no visible second phase, the doped B increased and the produced Li and He further increased the lattice constant. The heat treating makes He atom escape from the lattice to form He bubble at grain boundaries and results in a drop of lattice. The first-principles calculation gave the volume changes because of introducing B, Li and He and explained this lattice decline. Conclusion: A helium contained Al-B sample was successfully prepared and there is no observable helium bubble in the irradiated sample. Heat treating promoted the helium atom aggregation and helium bubble formation, and removed defects and damages. The SAXS information for helium bubble is observed only in tempered sample. Abstract  
        关键词：B-doped aluminum;Neutron irradiation;Helium behavior;Small angle scattering;Neutron diffraction   
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        发布时间：2021-03-03
      • GE Mengran,LI Dandan,YAO Tao,PAN Guoqiang
        Vol. 37, Issue 9, Article number: 090104(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090104
        摘要：Background: During the past few decades, metal nanoclusters have received considerable research interests for their distinct optical, catalytic and electronic properties. However, till today, most studies are focused on the synthesis, structure and properties of Au and Ag clusters, while the studies on Cu nanoclusters are rather rare because of its inherent instability. Purpose: We aim to synthesize the Cu nanocluster that has the tunable photoluminescence. Methods: Through varying the initial legend molar ratio of 2-mercapto-5-n-propylpyrimidine and dodecanethiol, a series of Cu nanoclusters with different emission wavelength were prepared. The photoluminescence property and structure of these nanoclusters were studied by the photoluminescence spectrometry (PL), X-ray absorption fine structure (XAFS) and Matrix Assisted Laser Desorption Ionization Time of Flight Spectrometer (MALDI-TOF) mass spectrometry. Results: (1) PL spectra showed that with the increase of the proportion of dodecanethiol, the maximum emission wavelength of Cu nanoclusters shifted from 618 nm to 571 nm. (2) Mass spectra results indicated that the main products were changed from Cu5MPP3 (MPP: 2-mercapto-5-n-propylpyrimidine) in the presence of MPP alone to Cu4[MPP][C12SH] when the dodecanethiol was introduced, and remains unchanged with increasing the dodecanethiol. (3) XAFS results showed that with the increase of dodecanethiol, the Cu-S bond length was shortened from 0.228 nm to 0.224 nm. Conclusion: The reduction of the amount of Cu atomic number would lead to the shift of emission wavelength from 618 nm to 597 nm, and the shortening of Cu-S bond length pushed down the HOMO level which was formed by the Cu(I)-S. With the increase of the HOMO-LUMO band gap, the emission wavelength of the products shifted from 597 nm to 571 nm. Abstract  
        关键词：Copper nanoclusters;Tunable photoluminescence;X-ray absorption fine structure (XAFS);Synchrotron radiation   
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        发布时间：2021-03-03
      • AN Taiyan,FAN Hongyu,WANG Yan,WANG Xiang,LI Yue
        Vol. 37, Issue 9, Article number: 090201(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090201
        摘要：Background: In fusion reactors, W suffers from the displacement damage caused by high energy neutrons, and surface damage, such as blistering, erosion, and sputtering caused by low-energy (tens of eV to several keV) and high-flux (1020?1024 m?2?s?1) helium and hydrogen ions. Purpose: The understanding of the behavior of W materials in fusion environment is a major issue of the material-related stake of fusion reactors. Methods: W samples were irradiated with low-energy (100 eV) and high-flux (6×1020 ions?m?2?s?1) He+ at a sample temperature changing from room temperature to 800 °C to a fluence of 1×1025 ions?m?2. Microscopic evolution of these samples was carried out using scanning electron microscopy (SEM), transmission electron microscopy (TEM), conductive atomic force microscopy (CAFM) and X-ray diffraction (XRD). Results: Analysis indicates that the nanometer-sized fibre-form structure is formed in the surface of W. The spacing and the covering degree of the nanostructure increase with the irradiation temperature. Nanostructure layer may cause the damage of W surface, resulting in surface delocalized, but does not cause a change in the crystal phase of tungsten. Conclusion: Non-destructive conductive atomic force microscopy gives the direct evidence that the forming of the nanometer-sized fibre-form structure is related to the nano-sized He bubbles. This is important for understanding the microstructure formation process of tungsten material. Abstract  
        关键词：Tungsten;Irradiation damage;He bubble   
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        发布时间：2021-03-03
      • QI Yongshuai,HUANG Baodan,DU Li,ZHANG Hui,HUANG Kai,LI Guiping
        Vol. 37, Issue 9, Article number: 090301(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090301
        摘要：Background: Gliomas, originating from glial cells, are the most common neoplasms affecting the central nervous system, and glioblastoma multiforme is the most malignant subtype of glioma. The classical subtype of glioblastoma is defined by epidermal growth factor receptor (EGFR) gene amplification, and glioblastomas bearing EGFR amplifications often express EGFRvIII. This suggests that EGFRvIII may operate as critical drivers in the genesis of glioblastoma, hence representing ideal targets for targeted anticancer therapies. Purpose: The aim is to establish a radiolabeling method of antisense oligonucleotide (U2) from U87-EGFRvIII glioma cells with radionuclide rhenium (188Re) and to investigate the possibility of using 188Re-U2 as imaging agents for brain glioma. Methods: A high affinity of antisense oligonucleotide sequences U2 from U87-EGFRvIII glioma cells was screened by the cell systematic evolution of ligands by exponential enrichment, and was directly labeled with 188Re. The optimal labeling condition and stability in vitro were investigated by an orthogonal experimental design method. Labeling rates were determined by paper chromatography. Blood radioactivity clearance of 188Re-U2 in rabbits was evaluated by determining blood radioactive concentrations at different time points after injection of 188Re-U2, and its dynamic distribution was investigated by SPECT imaging. Results: Antisense oligonucleotide (U2) was successfully radiolabeled with 188Re and the labeling rate of 188Re-U2 was 70%±14%. After purification of the labeled 188Re-U2 with Sep-PaK C18 reversed phase extraction cartridge, the radiochemical purity was 70.6% after placing in physiological saline for 24 h and 95.55% after incubation at 37 ºC with human serum. SPECT imaging showed that 188Re-U2 could be quickly cleared from the blood in normal animals primarily through the kidneys, and the radioactivity in other tissues and organs remained low. Conclusion: This method of directly labeling antisense oligonucleotide (U2) with 188Re is simple with better labeling efficiency and stability both in vitro and in vivo, and so 188Re-U2 has more ideal biodistribution and biokinetics in vivo.Cited  
        关键词：Brain glioma;Antisense oligonucleotide;188Re;Radiolabeling   
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        发布时间：2021-03-03
      • MAO Wenjing,LIU Zhirong
        Vol. 37, Issue 9, Article number: 090302(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090302
        摘要：Background: Three-dimensional (3D) graphene nano-composite had been widely investigated for its excellent physical and chemical properties. Purpose: The aim is to study the adsorption of U(VI). Methods: 3D reduced graphene oxide RGO/FeOOH nano-composite was synthesized via self-assembly under the reduction of Fe(II) ion. Results: The absorption capacity of RGO/FeOOH was highly dependent on the pH values. When pH was 5.5, the adsorption capacity could rise to 115 mg?g?1 whereas the NaClO4 has no effect on the adsorption capacity of the composite. The adsorption isotherms of U(VI) of the RGO/FeOOH composite could be described well by the dual-site Langmuir model. In the ion-selective study, we found that RGO/FeOOH had good selectivity to U(VI) and Pb(II). Conclusion: This material can be used to remove heavy ions in radioactive waste water. Abstract  
        关键词：Three-dimension (3D) RGO/FeOOH;Uranium;Adsorption capacity;Ion selectivity   
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        发布时间：2021-03-03
      • XIA Jingkai,QIAN Sen,WANG Wenwen,NING Zhe,CHENG Yaping,WANG Yifang,JIANG Xiaoshan,WANG Zheng,LI Xiaonan,QI Ming,HENG Yuekun,LIU Shulin
        Vol. 37, Issue 9, Article number: 090401(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090401
        摘要：Background: Photoelectric devices such as photomultiplier tubes (PMTs), photo diodes (PDs) and solar cells are widely used in many applications, so reliable evaluation on the performances of such devices is quite necessary, especially for the accurate measurements and calibrations on the photocathode quantum efficiency (QE). Purpose: We aim to build up a cathode performance evaluation system and study the properties of different types of cathodes. Methods: Two different methods named as the relative measurement and the direct measurements were employed to measure the QE values of cathodes. In addition, a 2D platform was built to achieve convenient and accurate processes for the plane type photocathode position uniformity test. Results: With the evaluation system, the cathode properties of dozens of photoelectric devices were tested. The measured QE results, either from the relative or the direct measurement, are consistent with the data provided by the manufacturers or a third party. Conclusion: Our cathode evaluation system is reliable and could be used to study the detailed photocathode properties such as QE, spectral response and position uniformity. Abstract  
        关键词：Photoelectric conversion device;Photocathode;Quantum efficiency (QE) measurement   
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        发布时间：2021-03-03
      • MEI Mudan,SHAO Shiwei,HE Zhaozhong,CHEN Kun
        Vol. 37, Issue 9, Article number: 090601(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090601
        摘要：Background: Initial event analysis is the beginning of the reactor nuclear safety analysis and probabilistic safety assessment, and plays a key role in these analyses. At present, the initial event analysis evaluation method and experience are mainly used for the water reactors. There is hardly any analysis method and theory for the initial event analysis of the solid thorium molten salt reactor. However, with the research of molten salt reactor and the reactor progress of probabilistic safety assessment (PSA), initial event analysis has become increasingly important. Purpose: On the one hand, by carrying on the preliminary exploration research for the TMSR-SF1 (Thorium Molten Salt Reactor, Solid Fuel #1) initial event analysis, to determine TMSR-SF1 initial events of potential, causes radioactive release, and give the TMSR-SF1 initial event lists. On the other hand, the aim is to group the determinate initial events. Methods: First of all, we used the master logic diagram (MLD) analysis method, and referenced the initial event lists of pressurized water reactor, the fluoride-salt-cooled high-temperature reactor (FHR), the high temperature gas cooled reactor and the sodium cooled fast reactor, to carry on the TMSR-SF1 preliminary analysis and research of initial events and main external events. Then, the accident type classification method was applied to group theTMSR-SF1 preliminary determinate initial events. Results: Through the MLD analysis, we determined the preliminary initial event lists for TMSR-SF1 which contain 37 initial events, and given 6 class accident types of TMSR-SF1 initial events. Conclusion: This study provides basic foundation for the TMSR-SF1 PSA accident sequence analysis of the next step, and gives an important support for the integrity of the molten salt reactor safety analysis. Abstract  
        关键词：Solid thorium molten salt reactor;Probabilistic safety assessment (PSA);Master logic diagram;Initial event analysis   
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        发布时间：2021-03-03
      • CHENG Jinhui,AN Xuehui,ZHANG Peng,WANG Kun,ZUO Yong,TANG Zhongfeng,LI Zhong
        Vol. 37, Issue 9, Article number: 090602(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090602
        摘要：Background: Molten fluorides are used as a fuel carrier and coolant in the Molten Salt Reactor (MSR) and have been proposed to be the primary and secondary coolants for Advanced High Temperature Reactor (AHTR) and Very High Temperature Reactor (VHTR) in recent years. KF-ZrF4 (58-42 mol%) (FKZr) is of great potential for the above applications. Thermophysical properties of FKZr such as density, liquidus temperature, viscosity, thermal conductivity have important influences on the reactor physics and thermal hydraulic design. Few reports can be found in literature, and obvious discrepancies exist among the data obtained by different researchers. Purpose: On the basis of preparation of qualified FKZr salt, thermophysical properties such as melting point, enthalpy of fusion, density and thermal stability were measured and characterized by experiments. Methods: Differential Scanning Calorimetry (DSC), Archimedes and thermal gravimetric (TG) were used to measure the melting point, enthalpy of fusion, density and thermal stability of FKZr. Results: The measured melting point of FKZr is 693.6 K which is identical with the results in literature; the enthalpy of fusion is 71.8 J?g?1; the density is ??3.3841?0.8954×10?3 T (753?923 K) with the uncertainty less than 0.005 g?cm?3; no apparent weightlessness appears below 883 K; at 973 K, the weight loss is about 0.1%, and increases dramatically at 1053 K. Conclusion: The melting point of FKZr is appropriate as coolant in MSR. FKZr shows good stability and no obvious volatiles below 873 K；but at higher operating temperature, the problems caused by vapor pressure need to be investigated further. Abstract  
        关键词：FKZr;Thermophysical properties;Thermal stability   
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        发布时间：2021-03-03
      • ZHANG Chaozhu,GU Hanyang,LIU Gang,CHEN Yuqing,ZHOU Xiaojia
        Vol. 37, Issue 9, Article number: 090603(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090603
        摘要：Background: Control rod drop performance is essential for safety analysis of nuclear power plant. Purpose: To validate the design of control rod drive line (CRDL), a high-speed digital camera is used to record the control rod drop course in AP1000 CRDL drop performance experiment. Methods: The recorded video images are analyzed by a digital image processing method which includes digital image correlation and sub-pixel algorithm. Results: Based on such approach, the relationships of control rod’s position, velocity and acceleration with time are obtained. Conclusion: This approach has high accuracy theoretically and will be useful for validating and improving the design of CRDL. Abstract  
        关键词：Control rod drive line (CRDL);Drop rod performance;High-speed digital camera;Digital image correlation;Sub-pixel algorithm   
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        发布时间：2021-03-03
      • SUN Mengping,ZOU Jun,WANG Fang,JIA Wei,HU Liqin
        Vol. 37, Issue 9, Article number: 090604(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090604
        摘要：Background: The energy spectrum of water-cooled fusion-driven subcritical system is very complex. It contains large numbers of high-energy neutrons and thermal neutrons. Therefore, conventional database of fission reactors or fast reactors is not appropriate. Purpose: In order to improve the accuracy of the neutronics analysis for subcritical systems with moderated water-cooled blanket, nuclear cross-section data for thermal scattering was developed based on HENDL3.0/FG fine group. Moreover, a conceptual design of fusion-fission hybrid reactor for energy production, named FDS-EM, was tested and analyzed using the database. Methods: The THERMR module of the general application database processing program NJOY was used in developing the library. Critical safety benchmark testing had been carried out to test the reliability of the library. Results: The effectiveness of the nuclear database was validated by the benchmark testing. The influence of thermal up-scatter on keff, TBR and neutron flux was predicted and verified in theoretical and calculational perspectives. Conclusion: The up-scatter effect is essential in water-cooled fusion-driven subcritical system and this database could be used in the design of future fusion-driven subcritical system. Abstract  
        关键词：Water-cooled fusion driven subcritical system;Thermal up-scatter effect;Fine group data library;Neutron flux;Effective multiplication factor (keff)   
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        发布时间：2021-03-03
      • SUN Jianyou,ZOU Yang,YAN Rui,ZHU Guifeng,LI Guangchao,CHEN Liang,LI Dongcang,XU Hongjie
        Vol. 37, Issue 9, Article number: 090605(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090605
        摘要：Background: The 6Li in the coolant 2LiF-BeF2 of Fluoride-Salt-Cooled High Temperature Reactors, one type of generation IV, has a large microscopic thermal neutron absorption cross section. Purpose: The impact of 6Li concentration on the coolant temperature reactivity coefficient of Fluoride-Salt-Cooled High Temperature Reactors is reached. Methods: The coolant temperature reactivity coefficient was performed for Fluoride-Salt-Cooled High Temperature Reactors with different 6Li molar compositions of 2LiF-BeF2 as coolants by using the computer codes KENO in SCALE6 (Standardized Computer Analyses for Licensing Evaluation). Results: The neutron absorptive capability of 6Li in the coolant equals to that of 7Li when the 6Li mole content is 0.005%. The results are given that the coolant temperature reactivity coefficient is changing from negative value to positive value with increasing of the 6Li molar compositions of 2LiF-BeF2. Conclusion: Based on the analysis of the four factor formula, it can be concluded that the change of the thermal utilization coefficient mainly accounts for the increase of coolant temperature coefficient of reactivity.Cited  
        关键词：Infinite bed;6Li molar compositions;Macroscopic absorption cross section Σa;Four factors;Coolant temperature reactivity coefficient   
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        发布时间：2021-03-03
      • YU Jianhui,ZHANG Jingyu,ZHENG Limin
        Vol. 37, Issue 9, Article number: 090606(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.090606
        摘要：Background: The ASTRUM (Automated Statistical Treatment of Uncertainty Method) methodology is developed by Westinghouse. In this method, some important parameters for large break loss of coolant accident (LBLOCA) analysis are treated conservatively to get a conservative set, which is called confirmatory study. And the value set of parameters is then used to generate the reference transient input deck of ASTRUM calculation. The value set may be varied in different sampling cases. However, the ASTRUM is executed based on one value set of some parameters, although other parameters are sampled. The result of the ASTRUM calculation may be not very exact. Purpose: The aim of this study is to reduce the uncertainty and conservatism, and optimize the ASTRUM. Methods: The parameters concerned in the confirmatory study of ASTRUM were sampled by BE_SAMPLE code developed by this paper for each ASTRUM case. The optimized ASTRUM is executed in company with other sampled parameters. Results: The results of the original and optimized ASTRUM calculations are compared, and the peak cladding temperature (PCT) calculated by new ASTRUM is lower than the original result. Conclusion: The study on ASTRUM optimization reduces the uncertainty caused by confirmatory study, which makes the ASTRUM calculation much more precise. Abstract  
        关键词：Large break loss of coolant accident (LBLOCA);Best estimate (BE);ASTRUM (Automated Statistical TReatment of Uncertainty Method)   
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        发布时间：2021-03-03
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