最新刊期
      卷 0 ， 期 0 ， 2020
      • LIU Heng ZHOU Yongnian GU Songqi GAO Qian ZOU Yang JIANG Zheng WEI Xiangjun HUANG Yuying XU Hongjie
        Vol. 35, Issue 8, (2012)
        摘要：IK220 high-speed counter card is used at BL14W1 XAFS station of Shanghai Synchrotron Radiation Facility to establish the QXAFS scan system.This system simplifies the hardware structure.Changes in the monochromator energy can be read directly.The synchronization controls and data acquisition between the monochromator and the ionization chamber is achieved.XAFS spectra are acquired successfully by this QXAFS method.The existing hardware of the experiment station is used to the maximum level after the modification.The free switching between the ordinary XAFS methods and QXAFS methods saves time.  
        关键词：Synchrotron radiation;Time-resolved;IK220;QXAFS   
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        发布时间：2021-03-05
      • JIANG Geyang JIANG Bocheng FANG Wending CHEN Guanghua SHEN Liren
        Vol. 35, Issue 8, (2012)
        摘要：As the key components of modern light source,insertion devices affect performance directly of the light source.Due to technological limitations in manufacturing and installation of an insertion device,its magnetic field may well disturb the electron beam orbit.One solution to this problem is to add correction coils at both end of insertion device.A front-end feedback system,based on EPICS architecture,has been developed at SSRF for the elliptically polarized undulator(EPU10).It has been demonstrated that this feedback system has enhanced stability of beam current,with concise interface,complete functional control and real time control,hence the guaranteed higher quality of synchrotron radiations from the insertion devices,for the soft X-ray beam line and stations.  
        关键词：Accelerator;Insertion devices;Control system;EPICS;IOC   
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        发布时间：2021-03-05
      • DING Jianguo ZHAO Huan ZHU Haijun LIU Yajuan SHEN Liren
        Vol. 35, Issue 8, (2012)
        摘要：The SSRF power supply control system is a fully distributed control system based on the EPICS system.About 65K runtime database records run in the 27 VME/IOC controllers to make physics access more than 600 sets of power supplies distributed in the SSRF facility.In this paper,the layered system architecture and its working principles are introduced.The EPICS-based control solutions for the PSI-designed and SINAP-designed digital controllers are described.The hardware and software,together with the communication technology applied in the system,are presented.  
        关键词：SSRF;Magnet power supply;EPICS;Control system;Runtime database   
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        发布时间：2021-03-05
      • WANG Xuetao HUANG Guirong LIN Hongxiang ZHOU Weishi JIN Kai JIA Dachun LIU Yongtao
        Vol. 35, Issue 8, (2012)
        摘要：In this paper,we report the development of a phase control system for the 800 MeV Linac of Hefei Light Source(HLS),which includes an RF phasing system and a phase reversal system.The RF phasing system is composed of I/Q demodulator,electrical phase shifter and virtual oscilloscope.The phase reversal system consists of pulse signal generator and I/Q modulator.A prototype of the system is constructed.Test results show that it meets the design specifications: phase resolution of ±0.1°,online measurement accuracy of ±0.3°,closed loop phase stability of ± 0.5°,phase reversal accuracy of(180±2)°.  
        关键词：Linac;RF phasing system;Phase reversal system;I/Q modulation   
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        发布时间：2021-03-05
      • WANG Hua YAN Shuai YAN Fen MAO Chengwen LIANG Dongxu HE Yan JIANG Sheng LI Aiguo YU Xiaohan
        Vol. 35, Issue 8, (2012)
        摘要：The Gaussian Schell-model source theory is used to describe the hard X-ray micro focusing beamline with an undulator of the Shanghai Synchrotron Radiation Facility.Based on the model and general Huygens-Fresnel principle,propagation of cross-spectral density function in free space is studied.Equivalent source hypothesis is proposed and the effect of toroidal mirror on spatial coherence of the hard X-ray beams is studied.The theoretical results are consistent with the experimental results.Only divergence angles of the incident and outgoing X-rays are considered in the equivalent source hypothesis,hence an easy extension of the hypothesis to other beamline optical elements.  
        关键词：Synchrotron radiation;Spatial coherence;Equivalent source hypothesis;Toroidal mirror;Gaussian Schell-model source   
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        发布时间：2021-03-05
      • XU Huichao ZHOU Jianying GONG Peirong ZHU Zhouxia ZHANG Yongli LI Zhong
        Vol. 35, Issue 8, (2012)
        摘要：Fluorescence screen(FS) is an important part of beam position monitor(BPM) for locating light spot of beamlines in Shanghai Synchrotron Radiation Facility(SSRF).In this work,the photoluminescence characteristics of Ce:YAG and CVD diamond film were tested in energy range of 96 500 eV.The results showed that luminescence of Ce:YAG was obviously greater than that of CVD diamond in the energy range.Ce:YAG has been used as a proper material of fluorescence screen for soft X-rays in the XIL beamline at SSRF,with perfect pictures of diffraction patterns of the coherent X-rays.  
        关键词：Fluorescence screen BPM;Ce:YAG;CVD diamond film;Soft X-ray   
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        发布时间：2021-03-05
      • YANG Zhen LONG Jidong LAN Chaohui DONG Pan PENG Yufei SHI Jinshui
        Vol. 35, Issue 8, (2012)
        摘要：In this paper,for designing a neutron source,the neutron yield of T(d,n)4He reaction at 120 keV of incident deuteron energy is calculated by a mathematical method.The neutron yield by the incident beams of different percentages of D+and D2+was studied.The neutron yield increase effectively with the percentage of D+and decreases with increasing percentages of D2+.The effects of different target materials and components on the neutron yield are studied.The neutron yield is in proportion to the content of the tritium and in inverse proportion to the target atomic mass.Parameters of the ion source and the thick target are analyzed for improving performance of the neutron source.Effects of the oxide layer or film coatings in surface of the titanium tritide film on neutron yield are calculated,too.The results are compared with experimental results.A novel target design is introduced and its feasibility is studied.  
        关键词：D-T reaction;Neutron yield;Target film;Deuteron ion source   
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        发布时间：2021-03-05
      • ZHANG Benshang1,3 LIU Kebo3 LI Zhaopeng3 LI Kunhao3 ZHANG Hongna3 ZHAO Meihong3 YING Shizhou1 ZHU Chengshen1 YANG Mingcheng3 1
        Vol. 35, Issue 8, (2012)
        摘要：In this article,natural rubber is chosen as transitional layer of all-steel load meridian tyre,which is pre-vulcanized by 500 keV E-beam irradiation of up to 60 kGy.The results show that the Green strength of transitional layer increases with the dose,reaching four times at 60 kGy as much as the control(without irradiation).The viscosity of transitional layer increases rapidly below about 29 kGy,but changes little at higher doses.The final mechanical properties do not differ significantly from those of the control.However,thickness of the natural rubber transitional layer for an average single tire can be reduced by 1 mm(or 1.5 kg),without obvious adverse effect on the tyre performance.  
        关键词：All-steel load meridian tyre;Transitional layer;Radiation pre-vulcanization;Absorbed dose   
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        发布时间：2021-03-05
      • LU Jian 1,2 YU Xuefeng 1 LI Ming 1,2 ZHANG Leqing 1,2 CUI Jiangwei 1,2 ZHENG Qiwen 1,2 XU Jialing 1,3 1
        Vol. 35, Issue 8, (2012)
        摘要：By studying the total ionizing dose effect of commercial CMOS static random access memory(SRAM) under seven bias conditions,including static and dynamic state,the relationship of power dissipation current and functional error number versus total ionizing dose are obtained.The results show that bias condition has great influences on degradation of SRAM.Compared to the five static bias conditions,the dynamic operating state is relatively not sensitive to irradiation,with larger failure threshold dose.Total dose effect of SRAM is of the imprinting kind,and the stored state has significant influences on its irradiation damage effects.  
        关键词：SRAM;Total-dose irradiation;Different bias conditions;Irradiation damage;Pattern imprinting   
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        发布时间：2021-03-05
      • HAN Zijie KANG Wu HU Guangchun XIANG Yongchun
        Vol. 35, Issue 8, (2012)
        摘要：In this paper,gamma-ray distributions from nuclear weapon parts of different shapes are simulated.The gamma-rays from a cylinder nuclear part have axis-symmetry distribution,while the gamma-rays from prism nuclear parts are of asymmetry distribution.The quadra-and penta-prism distributions differ obviously from that of the cylinder.However,the asymmetry of hexa-,octo-and dodeca-prism reduces gradually to approach to the symmetry distribution of the cylinder.  
        关键词：Symmetry attribute;Sealed canister;Nuclear parts;Radiation distribution   
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        发布时间：2021-03-05
      • ZHAO Caifeng LU Xinwei LI Nan YANG Guang
        Vol. 35, Issue 8, (2012)
        摘要：A survey was done on natural radioactivity level and annual effective dose rate of main building materials in Baotou,China.The natural radionuclides of 40K,232Th and 226Ra in main building materials collected from Baotou were measured using NaI γ-ray spectrometry and the measured data were analyzed according to the national standards and radiological protection principles of the European Commission.The specific activities of 40K,232Th and 226Ra in the building materials samples were 218.82 1145.92,19.75 132.50 and 11.46 82.66 Bq/kg,respectively.The internal and external exposure indexes of building materials were 0.06 0.41 and 0.28 0.70,respectively.The annual effective dose equivalent was 0.41 0.97 mSv/y.This justifies the production and sale of the main building materials,as both the internal and external exposure indexes of building materials are less than 1.The effective dose rate of ash brick is 0.97 mSv/y,while the maximum acceptable value is 1 mSv/y.Therefore,it is necessary to control the amount of industrial waste residue in building materials to avoid unnecessary radioactive exposure to residents.  
        关键词：Main building materials;Natural radioactivity;Annual effective dose   
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        发布时间：2021-03-05
      • JIA Xiaolong1 ZHANG Quanhu1 LI Sufen1 LIU Jie1 ZUO Guangxia1 SUI Hongzhi2 QIU Xiaolin1 1
        Vol. 35, Issue 8, (2012)
        摘要：Tomography gamma scanning(TGS) technology is an important method for accurate determination of transuranic nuclides in medium-and high-density heterogeneously distributed media,hence the importance of determining the detection efficiency of a TGS.This can be done by a sourceless calibration based on Monte Carlo method.In this paper,a simulation model is established with a 6×6×6 sample division and the GR3091 HPGE system,and the relationship of spatial symmetry is used to save computer hours.Comparisons between the calculation and the measurement results prove that the computer simulation is a good method.  
        关键词：Tomographic Gamma Scanning;Detection efficiency;Sourceless calibration;Spatial symmetry relationship   
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        发布时间：2021-03-05
      • CHEN Yangchun1,2 ZHANG Chunlin3 XU Hao1 CHEN Ping2 FAN Mingwu1,3 1
        Vol. 35, Issue 8, (2012)
        摘要：The registered error between PET and CT imaging system was confirmed by a water model simulating clinical cases.A barrel of 6750 mL was filled with 59.2 MBq [18F]-FDG and scanned after 80 min by 2 dimension model PET/CT.The CT images were used to attenuate the PET images.The CT/PET images were obtained by image morphological processing analyses without barrel wall.The relationship of the water image centroids of CT and PET images was established by linear regression analysis,and the registered error between PET and CT image could be computed one slice by one slice.The alignment program was done 4 times following the protocol given by GE Healthcare.Compared with centroids of water CT images,centroids of PET images were shifted to X-axis(0.011slice+0.63) mm,to Y-axis(0.022×slice+1.35) mm.To match CT images,PET images should be translated along X-axis(2.69±0.15) mm,Y-axis(0.43±0.11) mm,Z-axis(0.86±0.23) mm,and X-axis be rotated by(0.06±0.07),Y-axis by(0.01±0.08),and Z-axis by(0.11±0.07).So,the systematic registered error was not affected by load and its distribution.By finding the registered error between PET and CT images for coordinate rotation random error,the water model could confirm the registered results of PET-CT system corrected by Alignment parameters.  
        关键词：Positron-Emission Tomography;Registered error;Random error   
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        发布时间：2021-03-05
      • GAN Lu1,2 WANG Zhenhua1,2 ZHANG Hong1,2 MA Chengjun3 LI Gang3 1
        Vol. 35, Issue 8, (2012)
        摘要：Radiation encephalopathy is the main complication of cranial radiotherapy.It can cause necrosis of brain tissue and cognitive dysfunction,to which no ideal prevention method is available until now.Hydroxysaffor yellow A(HSYA) is the main active ingredient of the traditional Chinese medicine safflower,with protective effects against cerebral ischemic injury.In this work,we investigated the protective effects of HSYA on brain injury in mice irradiated by 300 MeV/u 12C6+ ion beam.The whole head of male Kunming mouse was irradiated to 4.0 Gy after receiving daily intra-peritoneal injection HSYA for 3 d.One month later,the Morris water maze test was used to detect the spatial memory in mice.The Evans blue was used as the tracer to evaluate the permeability of blood-brain barrier.The SOD activity and MDA content in brain tissue were assayed by test kits.The results showed that the12C6+ irradiation significantly impaired the spatial learning and memory in mice,increased the permeability of blood-brain barrier and the MDA content in brain tissue,whereas decreased the SOD activity in brain tissue.The pretreatment with HSYA could improve the spatial memory deficits and inhibit the changes of the blood-brain barrier,the SOD activity and the MDA content in brain tissue in mice.All these demonstrate that HSYA possesses the protective effect against brain injury induced by12C6+particle therapy.  
        关键词：Radiation induced brain injury;Carbon ion beams;Hydroxysaffor yellow A   
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        发布时间：2021-03-05
      • DING Weicheng1,2 WANG Yi2 FANG Fang1 1
        Vol. 35, Issue 8, (2012)
        摘要：A portable nuclear spectrometry system is of low power consumption,small size and low cost,and so is the MCA(multi-channel pulse amplitude analyzer).In this paper,we report a core controller of an MCA,which uses an on-chip system chip C8051F340 microprocessor.Results of the performance test,with the detection circuit,are given.C8051F340 is of high performance,and high performance MCA for a portable nuclear spectrometry system can be achieved by combining a C8051F340 with corresponding peripheral circuits and signal conditioning circuits.  
        关键词：Peak detection;Energy spectrum;Multi-Channel;Microcontroller;Pulse discriminate   
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        发布时间：2021-03-05
      • LI Lanting MI Lijuan HU Jun
        Vol. 35, Issue 8, (2012)
        摘要：Polymerase chain reaction(PCR) is an important diagnosis tool in molecular biology,which have been greatly improved by PCR.However,optimizing the experimental conditions is still a problem for PRC.Computer biology can be a solution to this problem.In this paper,developments of the mathematical models for PCA are reviewed.It is believed that this kind of research efforts shall be helpful for optimizing the experimental conditions and providing guidance for the biologists and understanding the mechanism of PCR.  
        关键词：Polymerase chain reaction;Computer biology;Optimization;Mathematical model   
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        发布时间：2021-03-05
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