最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHU Xiaohui,TAN Songqing,LI Rui
        Vol. 37, Issue 11, Article number: 110101(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110101
        摘要：Background: Shanghai Synchrotron Radiation Facility (SSRF) is an advanced third-generation synchrotron radiation electron accelerator. The synchrotron radiation devices require the magnets and magnet power supply of high performance, such as high precision and high stability. In the design of a magnet and a magnet power supply, the flux and current signals is required to be measured simultaneously. Purpose: In order to simultaneously measure the two signals with high precision, a high precision synchronization data acquisition system should be designed and implemented. Methods: An 18-bits, 5 MSPS analog to digital converter of AD7960 is used to realize the high precision data acquisition. The synchronizing trigger signal is produced by Field-Programmable Gate Array (FPGA), which is used to generate the control logic. Results: After the test of effective precision of Analog Digital Converter (ADC) and the synchronization performance, it is resulted that the effective precision of this system is better than 18 bits, and the performance of synchronization is great. Conclusion: The system proposed in this paper satisfies requirements of high precision synchronization data acquisition for SSRF. Abstract  
        关键词：Data acquisition system;High precision;Synchronous sampling;Analog Digital Converter (ADC);Ethernet;Magnet power supply   
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        发布时间：2021-03-03
      • HE Yongcheng,WANG Chunhong,WU Xuan
        Vol. 37, Issue 11, Article number: 110102(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110102
        摘要：Background: EtherCAT (Ethernet Control Automation Technology) is a kind of real-time Ethernet fieldbus protocol for industrial automation. The control system of many large-scale scientific facilities such as Beijing electron-positron collider (BEPCII), Chinese spallation neutron source (CSNS) was designed based on EPICS (Experimental Physics and Industrial Control System). Purpose: The aim is to implement EtherCAT as a real-time high speed control system solution for the EPICS based control system. Methods: The communication between EPICS IOC (Input/Output Controller) and EtherCAT devices was realized by using the OPC (Object Linking and Embedding for Process Control) Gateway driver. A real-time temperature monitoring appliance was taken as testing example. Results: The test results show that the communication between EPICS IOC and EtherCAT devices using the OPC Gateway driver is efficiently implemented. Conclusion: EtherCAT devices can be applied to communicate with the EPICS IOC to achieve real-time high-speed control by using the OPC Gateway driver. Abstract  
        关键词：EPICS (Experimental Physics and Industrial Control System);EtherCAT (Ethernet Control Automation Technology);OPC (Object Linking and Embedding for Process Control) Gateway;Accelerator control system   
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        发布时间：2021-03-03
      • XU Lipeng,GE Liangquan,LUO Yaoyao,ZOU Gongjiang
        Vol. 37, Issue 11, Article number: 110201(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110201
        摘要：Background: Many scholars at home and abroad had engaged in the research of underground radon in the earthquake. Purpose: The aim is to discuss the relationship between axial stress and radon precipitation quantity. Methods: Aim at red sandstone specimen under different axial stress, this paper made the axial strain experiment and the radon precipitation quantity measurement experiment. Results: The results show that the Burgers creep model can represent the creep characteristics such as instantaneous loading strain, decay creep and steady creep; according to the results of instantaneous radon measurement method and cumulative radon measurement method, the correlation coefficient between the axial stress and red sandstone radon precipitation quantity is up to 0.97 (p<0.05); the experimental result confirmed that the axial stress has a negative correlation with radon precipitation quantity. Conclusion: This result provides a strong evidence for the rock radon precipitation reduces under stress in the process of earthquake preparation, it has a positive guiding significance for using radon to forecast the earthquake. Abstract  
        关键词：Axial stress;Red sandstone;Radon precipitation quantity   
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        发布时间：2021-03-03
      • GONG Pin,TANG Xiaobin,CHEN Da
        Vol. 37, Issue 11, Article number: 110202(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110202
        摘要：Background: The setting of sterilization dose in practice is usually higher than the actual need of product due to the accuracy limit of traditional methods. Extra irradiation dose leads to unnecessary radiation damage to products and reduces the production capacity of irradiation plants. So it is important to find a more accurate method to set the sterilization dose for micropopulation. Purpose: This research is to find a new approach to set the sterilization dose more accurately for micropopulation of products. Methods: First of all, the relationship between the survival bacteria count and radiation dose through theoretical derivation is studied. Then, the data of sterilization dose curve of micropopulation is calculated according to the standard distribution of resistances (SDR). Finally, five kinds of commonly used fitting functions are applied to fit the sterilization dose curve. Results: The five cubed polynomial function is one of the best fitting methods to the sterilization dose curve. The sterilization dose setting method based on five cubed polynomial fitting reduces the deviation range from ?9.8% ? 123.1% to ?7.7% ? 1.9% between set sterilization dose and theoretical value, compared with the traditional method based on linear fitting. Conclusion: The method of polynomial fitting is more accurate that can reduce the extra radiation dose of products effectively when guarantee the quality of sterilization. Abstract  
        关键词：Polynomial fitting;Radiation sterilization;Standard distribution of resistances (SDR);Sterilization dose setting   
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        发布时间：2021-03-03
      • YIN Yongzhi,LI Meichun,WANG Huipeng,YAO Liping,YE Zhengqian
        Vol. 37, Issue 11, Article number: 110203(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110203
        摘要：Background: Virtual-Pinhole PET is one of the methods to achieve high-resolution animal PET image, which suggests to integrate high-resolution detectors into existing PET scanner. Purpose: To validate the Virtual-Pinhole PET concept, we aimed to improve the image resolution of PET system to sub-millimeter range. Methods: Monte Carlo simulation code GATE (Geant4 Application for Emission Tomography) was applied to study the imaging resolution of a full ring Micro Insert system integrated with the SIEMENS MicroPET Focus-220. The track of gamma ray in both Insert detectors and PET Scanner detectors of Focus-220 was obtained simultaneously in one data taken. Three types of coincidence detections for gamma ray interactions in PET Scanner detectors and Insert detectors were selected, which represented coincidence detections between PET Scanner and PET Scanner (SS), coincidence detections between PET Scanner and Insert (IS), and coincidence detections between Insert and Insert (II). The filtered back-projection (FBP) algorithm was employed to reconstruct the PET images of Na-22 point sources. Results: The image resolutions of GATE simulated data show 1.0?1.5 mm, 0.9?1.1 mm, and 0.5?0.9 mm at FWHM for SS, IS and II, respectively. These simulated results are kept good agreements with the experimental results of Micro Insert system obtained at Washington University. Conclusion: The image resolution of animal PET can be improved to sub-millimeter range by using Micro Insert PET system. Abstract  
        关键词：Monte Carlo simulation;Small-animal PET;Micro insert system;Image reconstruction   
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        发布时间：2021-03-03
      • HONG Bing,LI Taosheng,ZHANG Zhiyong,YAN Qiang,WANG Chenglong,DONG Liang,SU Zhe
        Vol. 37, Issue 11, Article number: 110401(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110401
        摘要：Background: A single sphere moderator and high sensitivity multi-counter (SMMC) is designed for portable neutron dosimeter. Purpose: In order to use the SMMC for practical application, the design of the electronics system is required to satisfy the requirement of the signal processing of SMMC. Methods: The system was mainly composed of the amplifier circuits, nuclear pulse shaped circuit, pulse amplitude discriminate circuits, instrument control circuit and power management circuit. Each of these components was designed and implemented for experimental evaluation. Results: Experimental results show that this electronic system could work stably and satisfy the design requirements. Conclusion: The electronics system could satisfy the function requirements of the new neutron dosimeter. The main functions of signal acquisition and amplifying, pulse discrimination, counting, instrument control, etc. were realized by the system. Abstract  
        关键词：Neutron detector;Amplification circuit;Complex Programmable Logic Device (CPLD);MSP430 microcontroller   
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        发布时间：2021-03-03
      • ZHENG Xiaohai,BAO Jie,HOU Long,CAO Jinyun,ZHANG Zichuan
        Vol. 37, Issue 11, Article number: 110402(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110402
        摘要：Background: To measure gamma ray in pulsed radiant hybrid field of gamma ray and neutron, the detector system is required to have a very fast time response, and a good r/n discrimination. Purpose: The aim is to do experimental study on the detector of Cherenkov plumbic-glass fiber matrix sensitive to gamma ray. Methods: Based on the Cherenkov radiant theory, simulation calculation of energy deposition of the gamma, neutron in fiber arrays materials was done by using MCNP. According to the calculation data, plumbic-glass was selected as Cherenkov scintillated optical fiber, combining with the material of gathering and transmitting scintillated light, the photomultiplier (PMT), we designed detector of Cherenkov plumbic-glass fiber matrix sensitive to gamma ray. And then the 14.1-MeV neutron sensitivity experiments are performed on the Cockcroft-Walton generator in China Institute of Atomic Energy, the 1.25-MeV gamma sensitivity experiments on 60Co source in Northwest Institute of Nuclear Technology. Results: The experimental r/n discrimination is about 42.3 at incident angle of 45°, which is accord basically with the result of simulation calculation. Conclusion: The detector system has high r/n discrimination, which can fulfill the requirements for gamma ray measurement in pulsed radiation hybrid field. Abstract  
        关键词：Cherenkov;Fiber matrix detector;Sensitivity;Pulsed radiant hybrid field of gamma ray and neutron   
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        发布时间：2021-03-03
      • WANG Lizong,ZHU Xuebin,YANG Jianlun,ZHANG Jianhua,FENG Jinghua,LI Bojun,YANG Gaozhao
        Vol. 37, Issue 11, Article number: 110403(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110403
        摘要：Background: Because 235U fission cross-section with neutrons remains almost constant in the fission neutron energy region, the neutron-induced fission fragments detection system with flat neutron energy response will be widely used in pulsed fission neutron yield measurement. Purpose: The neutron-induced fission target chamber detection system consisting of 235U target and PIN detector is designed and investigated experimentally. Methods: The fission fragment energy spectrum and average energy deposited in the PIN detector are calculated by Monte Carlo simulation coupling with TRIM2000. Average deposit energy of 235U fission fragment in PIN detector is measured by recording fragment energy spectrum at K-400 accelerator neutron source. Results: The experimental results are compared with theoretical calculation. The calculated average deposited energy is in fact over-estimated because of pulse height defect of fission fragments in PIN detector. With the calculated neutron detecting efficiency and the calibrated average effective deposited energy available, the neutron sensitivity can be determined, and neutron energy response curve of fission target chamber detection system can be obtained. Conclusion: The present results can furnish theoretical and experimental indication for design of fission target chamber detection system. Abstract  
        关键词：Fission fragment;Fission target chamber;PIN detector;Deposit energy   
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        发布时间：2021-03-03
      • ZHU Chuanxin,MOU Yunfeng,ZHENG Pu
        Vol. 37, Issue 11, Article number: 110404(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110404
        摘要：Background: Gadolinium-loaded liquid scintillator was widely used in the research of nuclear physics, (n,r) discrimination and distribution of neutron capture time of gadolinium-loaded liquid scintillator were main values of detecting performance. Purpose: This paper attempts to develop the 0.5%wt gadolinium-loaded liquid scintillators with better neutron gamma discrimination factor by measuring the detecting performance of gadolinium-loaded liquid scintillators of several proportion and composition. Methods: The neutron gamma discrimination of gadolinium-loaded liquid scintillator detectors were measured using zero-crossing discrimination. The distribution of neutron capture time was measured for the ?13 cm×30 cm gadolinium-loaded liquid scintillator detector with coincidence method, the start signal was got from fission fragment of 252Cf fission chamber, the stop signal was got from anode output of gadolinium-loaded liquid scintillator detector. Results: It shows that the best of neutron gamma discrimination can be offered when naphthalene is set with 7.5%wt in the gadolinium-loaded liquid scintillator. The result showed that neutron capture time of the ?13 cm×30 cm gadolinium-loaded liquid scintillator detector was distributed within 30 us, the average time of neutron capture was 11 us. Conclusion: The neutron capture time property of homemade gadolinium-loaded liquid scintillator meets the experiment requirements. Abstract  
        关键词：Gadolinium-loaded liquid scintillator;Distribution of neutron capture time;Fission chamber   
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        发布时间：2021-03-03
      • NIU Yongsheng,SUN Lixin,HU Congwei,ZHANG Huanqi,DOU Qiang,WU Guozhong,LI Qingnuan
        Vol. 37, Issue 11, Article number: 110601(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110601
        摘要：Background: High temperature fluoride volatility process (HFVP) is an important pyroprocessing method for separating and recovering fissile material uranium from the spent fuel. Purpose: The goal of this work is to establish an on-line measurement technique for gaseous products. Methods: We established this technique based on infrared spectrometer in HFVP. Results: It was found that during the UF4 fluoride volatility reaction process, in addition to UF6, there were MoF6, UO2F2 and HF formation. The possible source of those compounds was analyzed according to their concentrations during the reaction process. Conclusion: The results in HFVP showed that infrared spectroscopy may be expected to be used not only for on-line monitoring of the process, but also for optimizing the process through on-line detecting MoF6 from corrosion of structure material and UO2F2 and HF from hydrolysis of UF6. Abstract  
        关键词：Pyroprocessing;Uranium fluoride volatility;Fourier Transform Infrared (FT-IR);On-line monitoring and analysis   
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        发布时间：2021-03-03
      • WU Yanhua,CAO Yin,QU Shixiang,HE Zhaozhong,CHEN Kun
        Vol. 37, Issue 11, Article number: 110602(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110602
        摘要：Background: Vortex diode was a critical equipment of the passive residual heat removal system. The diodicity will affect the residual heat removal capability during accident conditions and heat losses during normal operations of the fluoride-salt-cooled high-temperature reactor (FHR). And difficulty and high cost of coolant FLiBe salt experiments are stirred up due to its strong corrosion and high melting point. Purpose: The aim is to find out whether alternative fluids that are safer and experimental friendly, such as H2O, #22 turbine oil and HTS-1 (NaNO3-NaNO2-KNO3, 7%-40%-53%) could be used in the experiment to study the diodicity of the vortex diode. Methods: A fluid to fluid modeling method based on the similarity principles was adopted. In addition, the feasibility of the modeling was studied using computational fluid dynamics (CFD). Results: The flowing condition of HTS-1 in the vortex diode can have a complete similarity to the FLiBe, and #22 turbine oil and H2O can have a partial similarity to the FLiBe. Conclusion: It is feasible to use HTS-1, H2O and #22 turbine oil instead of FLiBe to study the diodicity of a vortex diode with same structures. Abstract  
        关键词：Fluoride-salt-cooled high-temperature reactor (FHR);Passive residual heat removal system;Vortex diode;Modeling;FLiBe   
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        发布时间：2021-03-03
      • LIU Shaohai,CHEN Yongzhong,HAN Lifeng,ZHANG Ning,XU Haixia
        Vol. 37, Issue 11, Article number: 110603(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110603
        摘要：Background: Only the reliability of Rapid Spanning Tree Protocol (RSTP) and some other redundancy protocols is improved when a single-point failure occurs in the network, then the RSTP might be applied to control network of reactor’s digital instrumentation and control system (I&C). The Parallel Redundancy Protocol (PRP) released in standard IEC62439-3 and applied to the intelligent power transducing station is proposed as a possible solution to provide completely seamless switchover in case of a single-point failure. Purpose: In order to fulfill all the high-reliability requirements of redundancy control network, the PRP is applied to the digital I&C of nuclear reactor. Methods: The principle of achievable high reliability and high availability based on PRP are analyzed in detail, and a software implementation of PRP protocol has been developed based on TCP/IP over Linux in the application layer. Results: Test results show that the high reliability requirements of zero self-healing time and zero packet loss can be realized during the simple data transmitting experiments across the various network nodes. Conclusion: The PRP and the peoposed implementation plan can be employed to achieve high reliability control network for nuclear reactor’s I&C system. Abstract  
        关键词：Parallel Redundancy Protocol (PRP);IEC 62439-3;Digital instrumentation and control system (I&C);Control network;Reliability   
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        发布时间：2021-03-03
      • LIU Xin,CHEN Xianlong,ZHANG Xiu,YU Xiaolei
        Vol. 37, Issue 11, Article number: 110604(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110604
        摘要：Background: Reactor drive line is the "lifeline" of reactor control, which performs important safety functions. Purpose: To provide the basis for the drive line design assessment and nuclear power plant safety analysis. Methods: Through analyzing the stress of pressurized water reactor control rod assembly and control rod drive mechanism, established the mathematical model and the motion equation, and then solved by the finite difference method. Results: The program calculated value accords well with the test value of Ling’ao nuclear power plant phase Ⅱ unit hot rod drop. Conclusion: The rod drop time of calculation program based on this method can be used to the safety evaluation when pressurized water reactor is shut down. Abstract  
        关键词：Controlling rod assembly;Drive line;Rod drop time   
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        发布时间：2021-03-03
      • PAN Dongmei,CHEN Chong
        Vol. 37, Issue 11, Article number: 110605(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.110605
        摘要：Background: VisualBUS4.2 is an integrated multi-functional neutronics analysis software system improved by FDS (Fission/Fusion Design Study) Team using Monte Carlo method. It is developed to be used in reactor design, critical analysis, shielding and burn-up analysis. Purpose: The purpose of this work is to test the availability of VisualBUS4.2 in complex reactor design. Methods: The IAEA (International Atomic Energy Agency) fast reactor benchmark BN-600 was applied to VisualBUS4.2, and then the resulting neutronic parameters, including effective multiplication factor (keff), fuel Doppler coefficients (kDfuel), density coefficients (Wabs, WNa), axial expansion coefficients (Rax), radial expansion coefficients (Rrad), and effective delayed neutron fractions (?eff), were compared with the results obtained by other affiliations using their programs and databases. Results: keff, kDfuel, Rax, Rrad and ?eff are all matched well with the average value of other affiliations’ results. However, Wabs and WNa were differentiated among all affiliations’ simulation results which require further study. Conclusion: Preliminary test results show VisualBUS4.2 is applicable and reliable in complex reactor design. Abstract  
        关键词：Fast reactor;Benchmark;Neutronic;VisualBUS 4.2   
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        发布时间：2021-03-03
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