最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHOU Dayong,LIU Dekang,LIU Yajuan,SHEN Liren
        Vol. 37, Issue 12, Article number: 120101(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120101
        摘要：Background: With the development of computer technology and Ethernet technology, programmable logic controller (PLC) has the ability to access Ethernet with its Ethernet communication module, so the device controller can be connected directly to the Ethernet network. Purpose: The aim is to apply the Ethernet technology for the accelerator device controller to the upper-level control system. Methods: The Shanghai Synchrotron Radiation Facility (SSRF) control system is based on the large-scale software EPICS (Experimental Physics and Industrial Control System). The EPICS communication is mainly based on Ethernet technology. Control devices are connected to the EPICS either by their self-contained driver or by implementation of the approriate Ethernet application program interface (API). Results: PLCs with Ethernet connection are widely used in SSRF device control system whilst other control devices are connnected to EPICS by developing Ethernet API. Conclusion: The Ethernet technology ensures good reliability and easy maintenance of the SSRF device control.Cited  
        关键词：Ethernet;EPICS (Experimental Physics and Industrial Control System);Programmable Logic Controller (PLC);Device control   
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        发布时间：2021-03-03
      • LUO Jianhui,ZHOU Haisheng,MA Ge,HEI Dongwei,WEI Fuli,XU Xi
        Vol. 37, Issue 12, Article number: 120201(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120201
        摘要：Background: Study of the ionizing radiation effects for semiconductor devices and integrated circuits is becoming more and more important for the improvement of their radiation hardening in microelectronics field due to the dose enhancement effects of X-ray. Experimental data of X-ray shielding effectiveness on outer shell can only be acquired by simulation calculation in the past. Purpose: In order to ensure the reliability of the electronics system inside shell in X-ray radiation environments, a novel method for measuring X-ray shielding effectiveness of enclosed shell is proposed, which can be established in laboratory. Methods: The generation of specific energy spectrum X-ray radiation field is designed and implemented to perform X-ray dose response calibration experiments using the LiF thermoluminescent dosimeter, which is chosen to fit the circumstance of enclosed shielding cavity and the narrow internal space. Based on the bremsstrahlung spectra of the X-ray generater, a target X-ray energy spectrum in real environment is imitated by filtering and multiple combinations. The dose response of LiF is measured under the irradiation of 60Co source (1.25MeV). The discrete semi-monochrome X-rays (20?100keV) was established as the LiF energy response calibration X-ray sources by X-ray exciting fluorescence. The experiments of X-ray shielding effectiveness and dose contribution are carried out for sample shell, and dose effect experiments of scatter X-ray are performed on constructed spectrum. Results: The experimental results show that dose of scatter X-ray contribution can be observed significantly on the internal cavity. Conclusion: The method has been applied successfully on the measurement of sample shell, and the data of X-ray shielding effectiveness are acquired. It provides an experimental evaluation approach for X-ray radiation hardening technology. Abstract  
        关键词：X-ray;Spectrum configuration;Enclosed shell;Shielding effectiveness;Thermoluminescence detector (TLD)   
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        发布时间：2021-03-03
      • ZHAO Xiangxue,WANG Yan,LIANG Lizhen,HU Chundong,WEI Jianglong
        Vol. 37, Issue 12, Article number: 120202(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120202
        摘要：Background: The deflection magnet is one of the key components of the neutral beam injector, it is installed in the neutral beam injector vacuum chamber. While the neutral beam injector works, the heat generated by current running through exciting coils of deflection magnet must be taken away by the cooling water simultaneously. Purpose: In order to meet the requirements of the developing nuclear fusion researches, the neutral beam injector must work steadily, providing neutral beam of high energy, high power continuously. The cooling abilities of the deflection magnets must be enhanced. Methods: The water cooling structure of excitation coils of the original deflection magnet was optimized by adding a pair of water taps in each primary coil, and the tests were made to check the cooling capbilities of the improved exciting coils. Results: When the neutral beam injector runs at the state of long pulse, improved water cooling structures take away the heat generated by the exciting coils timely. The improvement of the cooling abilities of the coils was successful. Conclusion: The temperature difference between the inlet and outlet of the cooling water pipe is about 21 oC, and the surface temperature of deflection magnet coil is about 45 oC. Abstract  
        关键词：Neutral beam;Deflection magnet;Exciting coils;Structural design;Experimental tests   
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        发布时间：2021-03-03
      • LI Lei,TUO Xianguo,LIU Mingzhe,SHI Rui,WANG Jun
        Vol. 37, Issue 12, Article number: 120203(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120203
        摘要：Background: Nuclear decay, electronic noise, statistic fluctuations, etc., exist inherently. Therefore, the measured spectrum always has statistic fluctuation. Purpose: In order to reduce the statistical fluctuation and electronics noise in detector, translation invariant discrete wavelet transform (TI-DWT) wavelet modulus maxima spatial selectivity filter (TI-DWT-MSSNF) smoothing algorithm was put forward to preprocess data for the de-convolution of spectrum. Methods: The ?-spectrum was acquired by using ORTEC-8 channel ? spectrometer to measure the source numbered AMPU1103 (239Pu and 241Am) under vacuum conditions of ?0.03MPa. The ?-spectrum was obtained by using ? spectrometer and 137Cs source. Cubical smoothing algorithm with five-point approximation (“5-3”), the traditional method of wavelet modulus maxima (WTMM) and TI-DWT-MSSNF were applied to smooth ? and ? spectra. Results: The study showed that TI-DWT-MSSNF method could eliminate statistical fluctuation more thoroughly, retain feature information better compared with “5-3” and WTMM. The D(r) values of TI-DWT-MSSNF were greater and ?2 values of TI-DWT-MSSNF were more close to 1 compared with those of “5-3” and WTMM. Conclusion: Comprehensive research indicates that it is feasible to reduce the statistical fluctuations of spectrum using TI-DWT-MSSNF. And TI-DWT-MSSNF outperforms both the “5-3” and WTMM. Abstract  
        关键词：Translation invariant discrete wavelet transform (TI-DWT);Modulus maxima;Smoothing evaluation   
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        发布时间：2021-03-03
      • WANG Yan,FAN Hongyu,LYU Mengyao,ZHOU Gengqian,GUAN Yanmin,NIU Jinhai
        Vol. 37, Issue 12, Article number: 120204(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120204
        摘要：Background: Irradiation damage in materials has been of major interest for the nuclear materials community due to the needs to well understand and predict the behaviors of fusion reactor materials. Molybdenum (Mo) has been regarded as the potential candidates for the plasma-facing materials (PFMs) in Tokmak fusion reactors. Purpose: The understanding of the irradiation damage behavior of Mo is the major issue for development of key fusion reactors materials. Methods: Polycrystalline molybdenum materials have been irradiated with low-energy (100eV) and high-flux (~1021 ions?m−2?s−1) He+ at the irradiation temperature of 600 oC. The effects of ion dose and annealing temperature on the surface damage of molybdenum are investigated. The morphology, microscopic evolution and distribution of defects of these samples before and after irradiation are compared using scanning electron microscopy (SEM) and non-destructive conductive atomic force microscopy (CAFM). Results: Analysis indicates that He+ irradiation can induce the increase of molybdenum sample grain size. The distribution of irradiation defect is depended on the grain orientation. The specific orientation of molybdenum material has a good performance in irradiation resistance. Conclusion: This work is of guiding significance to the exploration of the suppression of material irradiation damage.Cited  
        关键词：He+ irradiation;Molybdenum (Mo);Surface damage;Conductive atomic force microscopy (CAFM)   
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        发布时间：2021-03-03
      • ZUO Wei,WU Hubing,WANG Quanshi,LI Hongsheng,ZHOU Wenlan,DONG Ye
        Vol. 37, Issue 12, Article number: 120301(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120301
        摘要：Background: 18F-FDG PET/CT has been considered of limited value for detection of gastric cancer because of the digestive physiological motility, physiological uptake and inaccurate alignment PET/CT image. Purpose: The aim is to investigate the value of 18F-FDG PET/CT for diagnosing the gastric cancer using milk and meglumini diatrizoate for filling gastric cavity. Methods: Eight-one patients, who were suspected to have or needed to exclude gastric cancer, underwent 18F-FDG PET/CT scans. All of them were orally administrated with the mixture of milk and meglumini diatrizoate for filling the gastric cavity after the finish of routine 18F-FDG PET/CT whole body imaging. 10?20 min later, regional PET/CT scan for the stomach was performed. The clinical role of PET and PET/CT with and without gastric cavity filling for diagnosing the gastric cancer was assessed visually based on the results of the histopathologic diagnosis and clinical following up. Results: 51 of the 81 patients were diagnosed to have gastric cancer and 30 have benign gastric diseases. After the gastric cavity filling, the sensitivity and specificity of PET for the gastric cancer were improved from 60.7% to 82.3% (?2=5.829, P=0.016) and from 46.7% to 76.6% (?2=5.711, P=0.017). By combined analysis of the morphological abnormality showed on CT and metabolic abnormality on PET, CT improved the diagnose of the gastric cancer in 6 patients with negative on 18F-FDG PET. However, the sensitivity of PET/CT for the gastric cancer before and after the gastric cavity filling were respectively 88.2%, 94.1%, and the specificity were 83.3% and 90.0%, which was not significantly different (?2=0.487, P=0.484 and ?2=0.144, P=0.704). Filling gastric cavity with a mixture of milk and meglumini diatrizoate, the tumor lesion and the scope of tumor invasion can display more clearly (t=6.866, P=0.000), in 45.0% (23/51) of gastric cancer patients with diffuse disease or low 18F-FDG uptake, which prompt that CT image change would help to more accurately display and judge the extent of violations. Conclusion: The method of gastric cavity filling with the milk and meglumini diatrizoate can eliminate the influence of gastric physically uptake and improve the visualization of the tumor lesion and the scope of tumor invasion, though it can not significantly improve diagnostic accuracy.Cited  
        关键词：Gastric cancer;Tomography;Emission-computed;X-ray computed;Deoxyglucose;Milk;Meglumini diatrizoate   
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        发布时间：2021-03-03
      • CHENG Ming,ZHOU Hongsheng,YU Haisheng
        Vol. 37, Issue 12, Article number: 120401(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120401
        摘要：Background: Pulse laser has been proved as an effective tool to simulate single event effects. It is important to evaluate the single event effects in microelectronics circuitry for space science and engineering. Purpose: By the theoretical analysis and experimental comparison, we aim to determine pulsed laser simulation of equivalent single event transient of Pulse Width Modulation (PWM) controller with heavy ion. Methods: By changing the laser energy, we obtained the experimental data under different conditions, and compared with the experimental data under the heavy ion. Results: The experimental results proved that Single Event Transient (SET) effect of 868.3-MeV Xe heavy ion which has 65.2 MeV?cm2?mg?1 Linear Energy Transfer (LET) value is similar with that of 1.064 μm, 1–2nJ pulsed laser. Conclusion: The experimental results provide data supports for using the laser pulse to simulate SET test on the same type of current mode PWM controller. Abstract  
        关键词：Pulsed laser;Pulse Width Modulation (PWM) controller;Equivalent Linear Energy Transfer (LET);Single event transient   
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        发布时间：2021-03-03
      • LIN Chao,CAI Chuangxiong,WANG Kai,HE Zhaozhong,CHEN Kun
        Vol. 37, Issue 12, Article number: 120601(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120601
        摘要：Background: Nitrate natural convection loop (NNCL) was designed to study the heat transfer behavior and corrosion behavior of direct reactor auxiliary cooling system (DRACS). DRACS is residual heat removal system of Advanced High-Temperature Reactor (AHTR) whilst the air cooling tower is the ultimate heat sink of DRACS. The structure of salt-to-air heat exchanger and the design of cooling tower are important in determining performance. Purpose: The aim is to study the performance on air cooling tower of nitrate natural convection loop, and finalize the optimization design. Methods: Based on the FLUENT software and structure model of the cooling tower, numerical simulations are carried out to study the heat transfer performance of NNCL. Results: The results show that the by-pass flow will reduce the heat transfer ability. The capacity of heat transfer can be enhanced by installing of the by-pass damper, and 3-layer by-pass damper can increase the capacity of heat transfer by as much as 100%. Conclusion: Numerical simulation can provide some basis for optimizing heat transfer performance of the air cooling tower, and increase the by-pass damper design is necessary to effectively avoid the by-pass flow of air heat exchanger.Cited  
        关键词：Air cooling tower;Forced air circulation;Natural air circulation;Computational fluid dynamics (CFD);By-pass dampers;Enhanced heat transfer   
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        发布时间：2021-03-03
      • ZHOU Xuemei,WANG Xiaohe
        Vol. 37, Issue 12, Article number: 120602(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120602
        摘要：Background and Purpose: Thorium Molten Salt Reactor-Solid Fuel (TMSR-SF) is a new type reactor. The neutron energy spectrum, an important parameter for TMSR-SF, needs to be measured, although the environment temperature is very high. The needed libraries for the measurement must be processed due to the special measurement environment. Therefore, the processes and the accuracy for the cross section library are important to the measurement result. Methods: Based on the recently released ENDF/B-VII.1 library, the process of using NJOY to obtain multigroup cross section needed by the neutron energy spectrum measurement of TMSR-SF at certain temperature is introduced. The relationship between multigroup cross section for two typical nuclear reactions and the temperature is analyzed. Homemade libraries at different temperatures are used in the neutron energy spectrum measurement. The difference of the results for neutron energy spectrum with different libraries is shown. Results: Analysis results indicate that the temperature will affect the cross sections of nuclear reactions, especially on the nuclide section of epithermal neutron with resonance peaks due to Doppler effect. The result of neutron energy spectrum measurement is influenced by the selected nuclear reaction. The result accords with the relevant physical laws. Conclusion: The homemade library in 873 K can be used in the neutron energy spectrum calculation for TMSR-SF. Abstract  
        关键词：ENDF/B-VII.1;Neutron energy spectrum;Multigroup nuclear cross section processing;Thorium Molten Salt Reactor-Solid Fuel (TMSR-SF)   
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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 12, Article number: 120603(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120603
        摘要：Background: The coolant temperature reactivity coefficient (CTRC) of the pebble fluoride-salt-cooled high temperature reactors (PB-FHR) is closely related to the core volume. Purpose: The relationship between the core volume of PB-FHR with 2LiF-BeF2 (7Li concentration: 99.995%) as coolant and the CTRC values are quantitatively analyzed. Methods: The CTRCs of FHR with different core volumes were calculated with the computer code KENO in SCALE5.1. Results: CTRC increases from negative to positive as the core volume increases from 2 m3 to an infinite value. Conclusion: Based on the analysis of the four factor formula, the different CTRC values with variant core volume can be attributed to the influence of the leakage probability, non-leakage probability and thermal utilization factor. Abstract  
        关键词：Core volume;Four factors;Non-leakage probability;Coolant Temperature Reactivity Coefficient (CTRC)   
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        发布时间：2021-03-03
      • TANG Chaoli,KUANG Bo,LIU Pengfei,ZHU Chen,WANG Fan
        Vol. 37, Issue 12, Article number: 120604(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120604
        摘要：Background: Through External Reactor Vessel Cooling (ERVC) to achieve the aim of In-Vessel Retention (IVR) is an important severe accident mitigation measure. After the Fukushima nuclear power plant severe accident, IVR-ERVC gains more and more attention. A full-scale IVR-ERVC engineering verification facility REPEC-II was constructed by Shanghai Jiao Tong University. Purpose: To study in-vessel retention by external reactor vessel cooling in large-scale advanced pressurized water reactor under severe accident conditions and meet the demand of verifying the validity of severe accident mitigation. Methods: The flow characteristics of the passages in some parts of the experiment conditions were calculated by RELAP5/MOD3. The natural circulation flow capabilities and features and the typical flashing eruption phenomenon in the experiment on the REPEC-II were preliminarily analyzed. Results and Conclusion: Comparative analysis showed that the calculated results were consistent well with the measured data and visual observation, and basically reflected the reliability of the calculations. Preliminary indication of the flow characteristics of the facility can be further analyzed in-depth, and applied to plan of follow-up experiments. Abstract  
        关键词：IVR-ERVC;Channel flow characteristics;Engineering verification experiment;RELAP5   
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        发布时间：2021-03-03
      • JU Xiaofeng,SUN Licheng,TANG Wencai,YUN Hongyu,YAN Changqi
        Vol. 37, Issue 12, Article number: 120605(2014) DOI: 10.11889/j.0253-3219.2014.hjs.37.120605
        摘要：Background: Bubble generator is a key device in the off-gas removal system of the molten salt reactor (MSR) for breaking up the carrier gas into tiny bubbles. Purpose: The distribution rules of velocity, pressure and turbulent kinetic energy along the flow direction of the Venturi bubble generator were analyzed with the software FLUENT. Methods: Based on the experimental water loop with the target bubble generator, numerical simulation using FLUENT was performed. Both the multiphase model (Mixture), standard k-ε turbulent model were adopted and the SIMPLEC method was employed to get the coupled solutions. Results: The distribution of velocity along the flow direction shows that the air is entrained by the water flew in the throat section and the air flew close to the wall of the generator. The speed of air is reduced significantly in the diverging portion of the bubble generator. The velocity gradient creates great shear stress, making the bubbles break up. The distribution of pressure shows that the peak of the pressure gradient appears at the entrance of the diverging portion of the bubble generator. The numerical results are very close to the data in the experiment, which indicates that the quick recovery of pressure may accelerate the breakup of bubble. The turbulent kinetic energy peaks at the entrance of the diverging portion of the bubble generator, which suggests that strong energy exchange there, resulting in strong shear stress to break up the bubbles. Conclusion: The large velocity gradient and the peak of turbulent kinetic energy at the entrance of the diverging portion of the bubble generator cause great shear stress, which is the reason for the bubble breakup taking place intensively there. Abstract  
        关键词：Molten Salt Reactor (MSR);Bubble generator;Bubble breakup;Numerical study   
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        发布时间：2021-03-03
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