最新刊期
      卷 0 ， 期 0 ， 2020
      • LENG Yongbin ZHOU Weimin YUAN Renxian YE Kairong CHEN Yongzhong YAN Yingbing ZOU Yi
        Vol. 33, Issue 6, (2010)
        摘要：The beam position monitor(BPM) system for the storage ring of Shanghai Synchrotron Radiation Facility(SSRF) has been developed.In this paper,we describe the physics requirement,design principle,software and hardware architecture of the BPM system.Development and implementation of the digital BPM processor,button type pickup assembly and signal cable network are given in detail.Online data showed that submicron position resolution at 10 Hz data rate was achieved after one year commissioning and optimization.The BPM system satisfied the SSRF,with better performance than the design specification.  
        关键词：SSRF;Beam diagnostics system;Beam position measurement;EPICS;Digital BPM processor   
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        发布时间：2021-03-05
      • FENG Chenxia ZHOU Weimin LENG Yongbin
        Vol. 33, Issue 6, (2010)
        摘要：Beam abort signal is a timing signal of the SSRF(Shanghai Synchrotron Radiation Facility) storage ring.It is used to synchronize BPM processor Libera logging beam position data to identify beam abort source and improve the stability of accelerator.The concept design and engineering design of beam abort trigger module are introduced in this paper,and lab test results of this module using RF signal source also presented.Online beam test results show that this module has achieved design goal,could be used to log beam position data before beam abort.  
        关键词：SSRF;Beam stability;Beam abort;Libera   
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        发布时间：2021-03-05
      • MI Qingru LIU Songqiang
        Vol. 33, Issue 6, (2010)
        摘要：The callback task in EPICS realizes asynchronous process in network transferring and device driver.In the asynchronous processing,only the data changed by device driver are collected,and transferred on the network.It alleviates the burden of both networks and the CPU load of IOC.In this paper,we analyze the callback task in EPICS,and introduce how to set up an ADC system with interrupt and callback.  
        关键词：EPICS;Asynchronous processing;Callback   
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        发布时间：2021-03-05
      • LIU Ping ZHOU Yongnian MI Qingru ZHANG Zhaohong HU Chun WU Yingfeng ZHENG Lifang
        Vol. 33, Issue 6, (2010)
        摘要：The beamline control system at SSRF was fully implemented using standard hardware and software technology.Based on the VME/IOC and EPICS platform,a data acquisition system with the ADC/DAC modules from Hytec Ltd.Co.,was developed to meet the requirements of some application research,such as X-ray beam position measurement,ion chamber measurement and user experiments.The online test showed that the system is applicable to various cases.  
        关键词：Beamline;DAQ;VME/IOC;EPICS   
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        发布时间：2021-03-05
      • XU Yichao1,2 HAN Lifeng1 CHEN Yongzhong1 1
        Vol. 33, Issue 6, (2010)
        摘要：A new beam profile diagnostics system for Shanghai Deep Ultraviolet Free Electron Laser(SDUV-FEL) has been developed based on industrial Ethernet,with good versatility and scalability.The system includes three major subsystems for image acquisition,pneumatic control and stepper motor control,respectively.Virtual instrument technology is adopted to drive the devices,and to develop the measurement software.In this paper,we describe the system structure,and its hardware and software design.The results of system commissioning are given as well.As an important diagnostic tool and data acquisition method,the system has been successfully applied to the measurement and control of the SDUV-FEL.  
        关键词：Ethernet-based CCD;Beam profile;Image processing;FEL;Diagnostics system   
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        发布时间：2021-03-05
      • LIU Ming1,2 YIN Chongxian1 ZHAO Liying1 LIU Dekang1 1
        Vol. 33, Issue 6, (2010)
        摘要：In a large scale accelerator facility,the event timing system is a sophisticated deterministic data broadcasting system,in which signal generator broadcasts timing messages to signal receivers.If the signal receivers can communicate with each other,the timing function and real-time data transfer function can be satisfied in one unified system.Based on this idea,a novel timing system was developed at SSRF to realize the function mentioned above.In this paper,we describe the system structure,hardware design and its specifications,including timing trigger accuracy,timing trigger jitter relative to RF signal and data transfer rate.The system design further attaches special importance to redundant topology structure and fiber length compensation.The system’s preliminary hardware design and laboratory test have been completed.  
        关键词：Timing system;Real-time data transfer;Timing jitter   
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        发布时间：2021-03-05
      • ZHOU Dayong LIN Guoqiang LIU Dekang SHEN Liren
        Vol. 33, Issue 6, (2010)
        摘要：An electron gun is the key part of a linac,the beam quality of which depends on beam quality of the electron gun,hence the need of a stable control system of the electron gun to ensure its safe operation.In this paper,we report our progresses in developing the linac’s electron gun control system of Shanghai Synchrotron Radiation Facility(SSRF).It uses PLC as the device controllers,with the monitoring software developed on EPICS.The whole system is connected by Ethernet.The PLC and Ethernet technology ensures good reliability and easy maintenance of the electron gun control system.  
        关键词：PLC;Electric gun control system;EPICS   
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        发布时间：2021-03-05
      • ZHANG Xin1 HUANG Qing2 CHEN Baodong1 LUO Lei1 ZHU Yongguan1,2 1
        Vol. 33, Issue 6, (2010)
        摘要：Distribution of arsenic and the relationship with other elements in aquatic macrophytes Wolffia globosa is helpful in understanding mechanisms of arsenic accumulation and detoxification,which will be important for arsenic phytofiltration in contaminated water by aquatic macrophytes.In this paper,we study the distribution features of As and seven more elements in rootless duckweed Wolffia globosa by means of μXRF.The results indicated that the distribution of As was similar to that of K,Mn and Zn while differs from that of Cu,Fe,Ni and Ca.  
        关键词：Rootless duckweed Wolffia globosa;Microfocused synchrotron based X-ray fluorescence(μXRF);Arsenic;Elements distribution   
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        发布时间：2021-03-05
      • WANG Liping DAI Congying WANG Jinye
        Vol. 33, Issue 6, (2010)
        摘要：Synchrotron small-angle X-ray scattering(SAXS) was used to determine structural changes in the systems of the reverse phospholipid micelles in hexane before and after various incubation periods of oxidation.Experimental scattering curves from PLPE system in hexane indicated that the samples were polydipersed.The scattering particles in this case are bigger,in an oval shape of larger ellipticity,than those in other phospholipid systems studied.The widest distribution reflects the presence of two different fractions in the sample of 3-d oxidation.After possible sedimentation of the biggest particles size distribution function becomes narrower for the sample of 6-d oxidation,3-d oxidation seems to be a critical period of the oxidation process.  
        关键词：Synchrotron SAXS;Phospholipids;PLPE   
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        发布时间：2021-03-05
      • WANG Tongmin1 XU Jingjing1 HUANG Wanxia2 LIU Chengchu1 CAO Zhiqiang1 LI Tingju1 1
        Vol. 33, Issue 6, (2010)
        摘要：Real-time dendrite growth of Sn-Pb binary alloy was observed with diffraction-enhanced imaging method at Beijing Synchrotron Radiation Facility(BSRF),and a series of time-sequenced images of the growth behavior and morphology evolution of dendrites were successfully obtained.These can offer the direct proofs to verify or improve the solidification theories of metallic alloy.The Sn-50wt%Pb alloy(near eutectic composition) grew in a manner with equiaxed first and then columnar dendritic morphology.This work provides a new approach for the study of alloy solidification and enables people have better understanding of alloy solidification processes.It is feasible to validate or complete the crystallization dynamics of metallic alloy by diffraction-enhanced imaging method.  
        关键词：Dendritic growth;Synchrotron radiation;Solidification;Diffraction-enhanced imaging;Sn-Pb   
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        发布时间：2021-03-05
      • XU Jingjing1 WANG Tongmin1 XIE Honglan2 ZHU Jing1 XIAO Tiqiao2 LIU Chengchu1 LI Tingju1 1
        Vol. 33, Issue 6, (2010)
        摘要：A third-generation synchrotron radiation imaging technique combined with a high-resolution fast-readout CCD(Charge Coupled Device) system was applied to study the dendrite growth of metallic alloy with high resolution images.As one of the first group users of Shanghai Synchrotron Radiation Facility(SSRF),we acquired a series of animated images of dendrite growth at different cooling rates,using the in-line holography imaging method.At an increased cooling rate,the dendrite grew in an equiaxed manner,the nucleation rate became higher,and the secondary DAS(dendrite arm spacing) reduced greatly.In addition,the formation of microsegregation was affected greatly by the cooling rate.  
        关键词：Synchrotron radiation source;Dendritic growth;Microsegregation;Secondary dendrite arm spacing   
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        发布时间：2021-03-05
      • JIN Jing WEI Biao FENG Peng TANG Yuelin ZHOU Mi REN Yong MI Deling
        Vol. 33, Issue 6, (2010)
        摘要：In this paper,for a nuclear information system driven by a 252Cf spontaneous fission neutron source,the random nuclear signals were analyzed and processed using both Hilbert-Huang Transform(HHT) and artificial neural networks(ANN).We got its time-frequency features and recognized its nuclear signal samples based on their classification.The results show that the time-frequency feature extraction method based on Hilbert marginal spectrum is applicable to separate the time-frequency feature of non-stationary nuclear random signal because it can reflect the time-frequency distributions.After classified recognition of nuclear signal samples using BP neural network,we also got ideal result that further verified the effectiveness and reasonability of the method.  
        关键词：Random nuclear signal;Hilbert-Huang transform;Artificial neural network;Feature extraction;Classification and recognition   
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        发布时间：2021-03-05
      • PENG Guoliang1 LI Tiecheng1 ZHANG Wenyong1 PENG Ting1 AI Zhiwei1 GUO Liping1 HE Qing2 WEN Wen2 1
        Vol. 33, Issue 6, (2010)
        摘要：SixMn1-x diluted magnetic semiconductors(DMS) were prepared by implanting 200 keV Mn ions into p-Si(100) wafers and annealing them at 600°C,700°C,800°C or 900°C under N2 atmosphere.The samples were studied by means of synchrotron radiation X-ray diffraction at SSRF(Shanghai Synchrotron Radiation Facility).It was found that the Mn implantation and thermal annealing resulted in appearance of silicon crystalline particles.At increasing annealing temperatures,the number of Mn atoms on interstitial sites decreased gradually while those on substitution sites increased.And the crystal lattice expanded,too.Interaction of Mn atoms between interstitial and substitution sites increased the ferromagnetism of SixMn1-x DMS samples.  
        关键词：Diluted magnetic semiconductors;Ion implantation;X-ray diffraction   
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        发布时间：2021-03-05
      • JIANG Xinbiao1 ZHU Yangni1 GAO Jijin2 LI Yiguo2 ZHOU Yongmao3 1
        Vol. 33, Issue 6, (2010)
        摘要：In this paper,we calculate the core physics parameters,beryllium reflector’ reactivity value and component reactivity value of neutron test duct,at Mini Power Reactor(MNPR) of China Institute of Atomic Energy(CIAE),by using MCNP/4B Monte Carlo code.The calculation results are in good agreement with the measured ones,and the conceptual mode suggested by this paper is very reliable.  
        关键词：Mini Power Reactor(MNPR);Reactivity value;Monte Carlo method   
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        发布时间：2021-03-05
      • WANG Yiyuan1,3 LU Wu1,2 REN Diyuan1,2 ZHENG Yuzhan1,3 GAO Bo1,3 CHEN Rui1
        Vol. 33, Issue 6, (2010)
        摘要：Three-terminal regulators used in electronic system were irradiated by 60Co γ-rays to investigate their total-dose effects.The results show that the output voltage and the maximum load current of the regulators were quite sensitive to the total dose.The output voltage of adjustable regulators changed more sharply than that of fixed.For circuits operating under the radiation environment,the fixed voltage regulator is better than adjustable regulators.Meanwhile,the maximum load current should be considered to satisfy the need of the circuits system with the reduction after irradiated.  
        关键词：Three-terminal regulators;Ionizing radiation;Total dose effect   
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        发布时间：2021-03-05
      • ZHANG Jianhua1 ZHANG Chuanfei1 HU Mengchun1 PENG Taiping1 WANG Zhentong1 TANG Dengpan1 ZHAO Guangjun2 1
        Vol. 33, Issue 6, (2010)
        摘要：Gamma-ray relative energy response of Ce:YAG crystal,which is important for pulsed γ-ray measurement,was studied in this work.The Ce:YAG crystal,which was developed at Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,was aligned point by point with γ-rays scattered from an industrial 60Co line source.The γ-ray relative energy response was calculated using the mass attenuation coefficient.The results show that the numerical calculation method of γ-ray relative energy response is reliable,and the experimental method with multi-energy point γ-ray by Compton scattering is also feasible,that can be used for checking up correctness of the numerical calculation results.  
        关键词：Pulsed γ rays measurement;Ce:YAG crystal;γ-ray relative energy response;Compton scattering;Mass attenuation coefficient   
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        发布时间：2021-03-05
      • CHEN Xiang XU Wenping LI Guangyue DING Dexin
        Vol. 33, Issue 6, (2010)
        摘要：Radon concentrations were measured in an apparatus at different temperatures and pressures.Radon dissolution coefficient was calculated at corresponding temperature and pressure.ANFIS model was established to predict radon dissolution coefficient at different temperatures and pressures.The results show that radon dissolution coefficient in water decreases with pressure,but increases with decreasing temperatures.The ANFIS model can predict the radon dissolution coefficient accurately.  
        关键词：Radon;Dissolution;Emanation;Dissolution coefficient;ANFIS   
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        发布时间：2021-03-05
      • FENG Changqing LIU Shubin HUANG Yaqi AN Qi
        Vol. 33, Issue 6, (2010)
        摘要：A calibration circuit for BESIII TOF electronics is described in this paper.An exponential-decay calibrating signal,of which the charge(integrated area of amplitude) was set by remotely-controlled DAC via VME bus,was generated by fast analog switch and fed to each time-and-charge measurement channel of TOF readout electronics.It has the charge accuracy of better than 10 bits and the dynamic range of more than 20 times.Detailed tests suggest that the nonlinearity of charge measurement,normally about 2%,can be greatly reduced to less than 0.6% after calibration.This calibration circuit scheme has been applied in BESIII project successfully.  
        关键词：Calibration;BESIII;Time of Flight   
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        发布时间：2021-03-05
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