最新刊期
      卷 0 ， 期 0 ， 2020
      • HUA Dong YU Xiaohan LI Zhong XU Hongjie
        Vol. 32, Issue 9, (2009)
        摘要：This paper describes the structure and principle of the blade x-ray beam position monitor of Shanghai Synchrotron Radiation Facility,with the theoretical analysis and calibration result of the XBPM system.Coefficient of the calibration was calculated from the least square method.Based on this result,the linear range and measurement accuracy were discussed.To meet the measurement accuracy of 10 μm,the linear range of the XBPM system was ±500μm,the calibration error was 3.25μm,the absolute position error was about 11μm and the relative position error was about 3 μm.  
        关键词：XBPM;Calibration;Linear range;Measurement accuracy   
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        发布时间：2021-03-12
      • YAN Yingbing LENG Yongbin CHEN Yongzhong ZHOU Weimin
        Vol. 32, Issue 9, (2009)
        摘要：The paper presents a real-time data acquisition and processing method of the booster tune measurement system for Shanghai Synchrotron Radiation Facility(SSRF).When the beam was excited,the signal from a beam position monitor(BPM) was processed in a Libera(digital beam position processor).A Soft IOC was introduced to find out the decimal part of betatron oscillation tune using Fast Fourier transform(FFT).Preliminary experiments in the commissioning showed that this method could meet the requirements of precision and speed.  
        关键词：Tune;EPCIS;Soft IOC;SSRF   
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        发布时间：2021-03-12
      • WANG Guanglin WANG Xiao SHAO Chunguang HONG Yilin LI Liangbin
        Vol. 32, Issue 9, (2009)
        摘要：In order to correlate structure with mechanic properties,a mini tensile tester was developed and installed on synchrotron radiation X-ray scattering station at NSRL.The tensile tester is featured by its small size,high-precision offset,adjustable stretching speed and temperature controlled environment for the testing sample.In an X-ray scattering measurement,a high resolution digital camera is attached on the tensile tester to collect the dimension of the sample simultaneously.This allows researchers to obtain the true stress-strain curve.  
        关键词：Mini tensile tester;Synchrotron radiation   
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        发布时间：2021-03-12
      • WANG Hongfei ZhANG Jidong ZHOU Qiaogen
        Vol. 32, Issue 9, (2009)
        摘要：In order to characterize the undulators used for 3rd synchrotron radiation light source,a stretch-wire magnetic field integral measurement system for measuring the first and second magnetic field integral distributions and integrated multipole errors in undulators has been established.The main features of this system are its high speed and high precision of the measurement,without space limit.Preliminary results demonstrate that the system achieves a system measurement precision of 1.2 Gs·cm for the first integral and 150 Gs·cm2 for the second integral.The system is efficient enough to carry out the measurements of magnetic field integral in undulators.  
        关键词：Undulator;Magnetic field integral;Magnet field measurement   
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        发布时间：2021-03-12
      • CAO Chongzhen WANG Fengqin ZHANG Minghui LI Yushan ZHAO Chunyu
        Vol. 32, Issue 9, (2009)
        摘要：A double-crystal monochromator is a key optical part of synchrotron radiation beamlines,and the effect of the first crystal attitude error on exit beam direction is complex.In this paper,a spatial diffraction model of synchrotron radiation on the face of the first crystal was established.The effect of the first crystal attitude error on the exit beam direction was obtained.At different Bragg angles,the position of facula in a fluorescent target was measured,and the pitch,roll and yaw errors was derived.The method has been applied in adjusting the first crystal attitude mechanism.  
        关键词：Synchrotron radiation;Double-crystal monochromator;First crystal;Attitude error   
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        发布时间：2021-03-12
      • GAOWEI Mengjia1,3 LIU Yuzhen1 CHU Wangsheng2 WU Ziyu2 WANG Changsui3 1
        Vol. 32, Issue 9, (2009)
        摘要：The Chinese ancient black mirror known as Heiqigu was studied by x-ray-absorption near-edge structure spectroscopy and results were reported.The Sn-L3 edge and Fe K edge spectra further confirmed the Schottky-type defect model in the Heiqigu surface system.And it was suggested that the surface layer of the mirror was a combined structure of oxidation of Sn(IV) and Sn(II).  
        关键词：Heiqigu;XANES;SiO2;Fe-doping   
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        发布时间：2021-03-12
      • Vol. 32, Issue 9, (2009)
        摘要：PNIPAM/montmorillonite(MMT) composite hydrogels were synthesized by radiation polymerization.Effects of the MMT on swelling and compressive properties of the hydrogels were investigated.The results showed that MMT could increase early swelling rate and balanced swelling rate of the composite hydrogel,but it did not change intrinsic environmental response performance and swelling mechanism of the hydrogel.The PNIPAM and PNIPAM/MMT hydrogels are of the same temperature sensitivity.The lower critical solution temperature(LCST) is about 32°C and the swelling mechanism also follows Fickian diffusion model,i.e diffusion of water molecule determines the swelling of hydrogels.Compression performance of the PNIPAM/MMT composite hydrogels was improved with the use of MMT and compression performance of composite hydrogels took on the upward trend with the increase of MMT content.  
        关键词：Monmorillonite;Composite hydrogels;Radiation polymerization;Swelling properties;Compressive properties   
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        发布时间：2021-03-12
      • MA Yanliang OUYANG Xiaoping ZHANG Zhongbing PAN Hongbo WANG Qunshu CHANG Yinzhong SHI Quanlin Wang Shilian
        Vol. 32, Issue 9, (2009)
        摘要：The sensitivity of slot-collimated PIN fission neutron detecting system(electrical current type) to γ-rays was studied by using an HPGe detector(counter type) and a 60Co source.Gamma-ray energy spectrum from a 235U-HPGe system of the same structure was simulated.The measured energy spectrum agreed well with the simulated spectrum.By replacing the HPGe with PIN,we obtained the γ sensitivity.  
        关键词：Fission;γ-ray;Energy spectrum;Detector sensitivity;HPGe detector   
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        发布时间：2021-03-12
      • XIONG Liangping XU Yunshu LI Yang
        Vol. 32, Issue 9, (2009)
        摘要：The structure,oxygen content,heat resistance and tensile strength of SiC ceramic fibers,which were synthesized by irradiating pyrolysis of polycarbosilane precursor fibers in a nuclear reactor,were tested and analyzed.FT-IR spectra indicated thatchemical structure of the fibers was very similar to that of pure SiC,while XRD patterns suggested that β-SiC micro crystals were formed in the fibers,and their mean grain size was about 7.5nm.The oxygen content(1.69wt%?3.77wt%) was much lower than that of conventional SiC fibers by oxidation curing method(~wt15%).After the SiC fibers were heat treated at 1400°C in air for an hour or at 1600°C in Ar gas atmosphere for 30 min,their external appearance was still undamaged and dense appearances,which show that heat resistance of the SiC fibers was eximious.Tensile strength of the SiC fibers was up to 2.7 GPa,which demonstrates their mechanical properties were excellent.  
        关键词：Silicon carbide ceramic fiber;Performance;Nuclear-reactor-irradiation;Curing   
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        发布时间：2021-03-12
      • LIU Rong JIANG Li WANG Mei LU Xinxin WEN Zhongwei LIN Jufang ZHU Tonghua WANG Dalun
        Vol. 32, Issue 9, (2009)
        摘要：Neutrons reflected by the cement material were studied by nuclear fission and activation methods with a D-T neutron source.With the small enriched uranium and depleted uranium fission ionization chambers combining to the capturing detector,the 235U(wrapped by Cd foil) and 238U fission reaction rates induced by reflected neutrons are measured on the horizontal equator of the Fe shell’s outer surface.The standard experimental uncertaininties of fission reaction rates were 6.1%~ 7.3% for 235U(wrapped by Cd foil) and 6.4%~ 7.4% for 238U.With five kinds of activation foils of different threshould energy,the 56Fe,27Al,93Nb,19F and 63Cu reaction rates induced by reflected neutrons were measured.The standard experimental uncertaininties of activation reaction rates were 7.2%~ 8.0%.The 235U(wrapped by Cd foil) fission reaction rates with a 252Cf neutron source were compared to the ones with a D-T neutron source.The experimental results were discussed and analyzed.  
        关键词：Cement Material;Reflected neutrons;Fission and activation reaction rates   
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        发布时间：2021-03-12
      • progression in mice liver WU Zhenhua1,3 ZHANG Hong1,3 ZHAO Weiping1,3 WANG Xiaohu4 WANG Yanling1,3 LI Ning1,3 LIU Bin1 XIE Yi1,3 CHEN Jidong1,3 HAO Jifang1,3 LIU Yang1,3 ZHANG Baoping5 1
        Vol. 32, Issue 9, (2009)
        摘要：To investigate effects of low dose heavy ions pre-irradiation on radiation damage in mice liver,Kun-Ming strain mice were irradiated to 0,0.05,0.1,0.25 or 0.5 Gy of 12C6 + ions,respectively,at a dose rate of 0.2 Gy/min.Four hours later,the mice were irradiated to 4 Gy by 12C6 + ions.At 8h after irradiation,the cell cycles of liver cells were analyzed by FACS,and the degree of DNA damage was measured by single cell gel electrophoresis through the determination of cells frequency with tail moment and tail lengths.The results indicated that compared with irradiation control group of 4 Gy,the percentages of cells after pre-exposure with low-dose 12C6 + ions at G0/G1-phase and G2/M-phase on liver decreased significantly,whereas the percentages of S-phase cells increased.Similarly,the tail length and tail moment induced by 12C6 + ion beams irradiation decreased evidently(P < 0.01 or P < 0.05),especially the 0.1 Gy pre-exposure group(P < 0.01).The data showed that pre-exposure with low-dose heavy ions could induce the adaptive response in liver cells of mice,alleviate the G0/G1 and G2/M phase arrest and reduce the DNA damages remarkably induced by 12C6 + ion beams.  
        关键词：Low dose pre-irradiation;12C6 + ions;Mice;DNA damage;Cell cycle;Comet assay   
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        发布时间：2021-03-12
      • LEI Yunyi1 LIN Kunhua1 WANG Fushun2 XU Yanli1 BAO Borong1 XU Yinjuan1 1
        Vol. 32, Issue 9, (2009)
        摘要：A kind of carboxylic ion exchange fiber was synthesized.The fiber static adsorption properties to uranium ion have been investigated.The influence of different experimental parameters such as final solution pH value,fiber weight,sorption time,temperature and initial concentration of uranium ion were evaluated.The sorption isotherms of uranium were drawn.Langmuir and Freundlich equations were obtained.Results show that the fiber’s absorption capacity is relative to the concentration of uranium ion when pH> 2 and t=30 min.IR spectrum reveals that the carboxyl groups on the fiber are coordinated to uranium ion.  
        关键词：Carboxylic ion exchange fiber;UO22 +;Adsorption;Synthesis   
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        发布时间：2021-03-12
      • ZHOU Lei LIANG Hao XIONG Tao YU Xiaoqi ZHOU Yongzhao
        Vol. 32, Issue 9, (2009)
        摘要：An apparatus of low-energy positron lifetime spectroscopy using beam pulsing method has been established at the Nuclear Solid State Physics Laboratory,University of Science and Technology of China.It requires of a beam-pulsing subsystem capable of generating three signals:a 50 MHz signal in amplitude of >5 V,edge time of <2 ns and pulse width of about 7 ns,and another two sine signals at 50 MHz and 200 MHz.A time measuring subsystem capable of measuring the life time within 20 ns at 74 ps resolution is required,too.A prototype design of the two subsystems is presented in this article.Test results of the prototype show that all requirements by the low-energy positron lifetime spectroscopy have been met.  
        关键词：Beam pulsing;Jitter;Time measurement;TDC;FPGA   
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        发布时间：2021-03-12
      • QIAN Yi1 SU Hong1 KONG Jie1,2 DONG Chengfu1 MA Xiaoli1 LI Xiaogang1 1
        Vol. 32, Issue 9, (2009)
        摘要：A test system for front-end ASIC chip that developed for optimum performance with silicon strip detector was presented in this paper.The main circuit,implementation of a fast read-out control pulse generator based on CPLD and the realization of I2C bus using lines in parallel port were introduced.And the debugging and the performance analysis of the testing system were described.  
        关键词：Test system;Circuit design;I2C;CPLD;ASIC   
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        发布时间：2021-03-12
      • XU Hao1 LIU Zhen’an1 LU Yunpeng1,2 LI Lu1 ZHAO Dixin1 1
        Vol. 32, Issue 9, (2009)
        摘要：In this paper,we describe a new design of high-speed data transmission,used in BESIII trigger system,with optical fibers that was based on the on-chip serial/deserial transmitter in FPGA.Multi-channels and real-time data transmission was studied and tested carefully.A high level of confidence bit error rate,better than 2.3 × 10-16,was obtained.Real-time data could be transmitted synchronously among multi-channels.The transmission was tested in cosmic-ray test of MDC of BESIII.It provides reliable data transfer and meet the requirements of BESIII.  
        关键词：BESIII;Trigger;Serial;Optical;RocketIO   
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        发布时间：2021-03-12
      • LIU Fenglin CAI Yufang
        Vol. 32, Issue 9, (2009)
        摘要：A γ-ray computed tomography(CT) demonstrator based on fan-beam projection has been designed and built for education purpose,in which the principles of CT,its data acquisition and image reconstruction is presented.The system consists of a 137Cs source of 7.4×108 Bq,five-channel detectors using plastic scintillator and photo multiplier tube(PMT),a standard PC and an image processing and reconstruction software.The mechanics of the system is controlled and data is acquired by programs written in Visual C++.CT images are reconstructed using the presented software or MATLAB programs.  
        关键词：Computed tomography;Fan-beam projection;Convolution back-projection;Demonstrator   
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        发布时间：2021-03-12
      • QU Lianzheng1,2 YAN Hongsheng1 ZOU Zili1 JIANG Xueshu1 SUN Bingcheng1 1
        Vol. 32, Issue 9, (2009)
        摘要：To meet EAST superconducting Tokamak experiment requirement,it was necessary to design a system for continuous data acquisition and data service.This would help the operators to understand operation status of the experiment system,and guarantee normal status and safety of the system during the entire experimental process,especially in cooling-down.This paper describes the design and implementation process of this system.Testing and experiments show that the whole system is stable,flexible and effective.  
        关键词：Continuous data acquisition;Data service;EAST;LongScope   
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        发布时间：2021-03-12
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