最新刊期
      卷 0 ， 期 0 ， 2020
      • LENG Yongbin ZHOU Weimin CHEN Yongzhong ZHAO Guobi YU Jun LIU Dekang
        Issue 6, (2007)
        摘要：A precise DC current transformer (DCCT) system is a must for commissioning and operation of the storage ring of Shanghai Synchrotron Radiation Facility (SSRF). Hardware of the system to be completed consists of a Bergoz NPCT sensor, a NI PXI digital voltage meter and a PXI controller. The software was developed on LabVIEW platform to communicate with accelerator control system via EPICS Shared Memory IOCcore interface. Bench test and simulation results of the DCCT showed that 2μA resolution for DC current measurement and 0.5% relative accuracy for beam lifetime measurement could be achieved.  
        关键词：SSRF;DCCT;EPICS;Beam lifetime   
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        发布时间：2021-03-12
      • ZHU Yi1,2 XIA Shaojian1 WANG Naxiu1 FU Yuan1 1
        Issue 6, (2007)
        摘要：SSRF in its Phase I construction will have seven beamlines, of which five are insert device (ID) beamlines. In order to endure the intense heat load produced by the ID, new design of the white beam slits have been realized. The ideas and mechanism of the white beam slits are described in this paper.  
        关键词：SSRF;ID beamline;White beam slits   
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        发布时间：2021-03-12
      • HE Xiaoye HUANG Kaixi CHEN Senyu LIU Zuping ZHAO Yinghai
        Issue 6, (2007)
        摘要：The paper introduces a new type of high precision HLS (hydrostatic leveling system), which is mainly used in large scientific facility as electron accelerators and other large devices or buildings. Considerations on affecting factors such as effects caused by the difference of pressure or temperature among the vessel sensors on the measurement, the chose of working liquid and the influence of bubbles in the pipe, are discussed. Problems solved during the operation process are discussed, too.  
        关键词：Hydrostatic leveling system;Level monitoring;CCD   
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        发布时间：2021-03-12
      • HU Guangchun HAO Fanhua XIONG Zonghua ZE Rende ZHANG Jianhua
        Issue 6, (2007)
        摘要：Special information is implicated in energy spectra of high-energy (Eγ>3 MeV) γ-rays from the products decaying after neutron-induced fission. At Lawrence Livermore National Laboratory, a method to use the spectral information of high-energy γ-rays has been established to detect special nuclear materials. Having been exploring such a new method to measure number of nuclear fission, we experimented with enriched 235U samples irradiated by reactor thermo neutrons to measure total counts of high-energy γ-rays from the fission products at different times after fission. A variety of 3-5MeV γ-rays after 235U single nuclear fission vs time was investigated, and intensity changes of 3-5MeV γ-rays at various times after 235U fission are given in the paper.  
        关键词：Enriched Uranium sample;Irradiation experiment;High-energy decay γ-ray   
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        发布时间：2021-03-12
      • WANG Jing HU Jinbo LI Qilong 1
        Issue 6, (2007)
        摘要：Ion implantation is a well established technique for surface property modification of materials. In 1995, Li qilong’s group introduced it to analytical chemistry and prepared ion implanted electrodes. The paper gives a review in this field of research, in especially preparation of an ion implanted electrode, the performance, and applications in analytical chemistry, as were summarized in Table 1.  
        关键词：Ion implantation;Modified electrode;Analytical chemistry   
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        发布时间：2021-03-12
      • WANG Tongquan YU Wanrui FENG Yufang
        Issue 6, (2007)
        摘要：According to nuclear decay cascades, a program involving 11 radioactive nuclides and helium accumulation in plutonium material is compiled. The α energy spectra calculated by Monte-Carlo method and evolvement of the decay products are described. In the program, a random number generator is designed by using the MODULE function in Fortran 95. The MODULE function has good feasibility and is easy to be adopted in other program to simulate the aging of plutonium.  
        关键词：Plutonium aging;Decay cascade;Helium bubble;Monte-Carlo method   
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        发布时间：2021-03-12
      • FAN Ruirui1,2 CHEN Ruofu1,2 XU Hushan1 XIAO Zhigang1 LI Songlin1 HUANG Tianheng1,2 SUN Zhiyu1 XU Zhiguo1 HU Zhengguo1,2 MAO Ruishi1,2 FU Fen1,2 ZHANG Hongbin1 ZHENG Chuan1,2 ZHANG Xueheng1,2 GAO Hui1,2 GAO Qi1,2 Li Bo1,2 1
        Issue 6, (2007)
        摘要：Spectral performance of the CsI(Tl) crystals developed at the Institute of Modern Physics (IMP), Chinese Academy of Sciences was tested with 137Cs γ-rays and the intermediate energy heavy ions. To read out with the photodiode, the energy resolution is better than 10% for 662 keV γ-ray and the light output is over 20% higher than products commercially available, while the energy resolution is better than 2% for heavy ions with energy around 30 MeV/u.  
        关键词：CsI(Tl) crystal;Energy resolution;Light output   
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        发布时间：2021-03-12
      • ZHAO Jia1,2 CUI Mingqi1 ZHAO Yidong1 ZHOU Kejin1 ZHENG Lei1 ZHU Jie1 SUN Lijuan1 CHEN Kai1 MA Chenyan1 1
        Issue 6, (2007)
        摘要：This paper presented an experimental method for measuring diffraction efficiencies of crystals with synchrotron radiation source. The rationality and reliability of this method were proved by analysis and correction the theoretical data of a Si (111) standard sample. High correlation was found between the diffraction efficiency and source emittance.  
        关键词：Synchrotron radiation;Crystal diffraction efficiency;Source emittance   
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        发布时间：2021-03-12
      • LI Guijie ZHANG Jianmin
        Issue 6, (2007)
        摘要：Numerical simulation of ratio of C/O spectroscopy in logging by Monte-Carlo method is made in this paper. Agree well with the measured spectra, the simulated spectra can meet the requirement of logging practice. Various kinds of C/O ratios affected by different formation oil saturations、borehole oil fractions, casing sizes and concrete ring thicknesses are investigated. In order to achieve accurate results of processing the spectra, this paper presents a new method for unfolding the C/O inelastic gamma spectroscopy, and analysis for the spectra using the method, The result agrees with the fact. These rules and method can be used as calibrating tools and logging interpretation.  
        关键词：Logging;Gamma spectroscopy;C/O;Unfolding spectrum;Monte-Carlo method   
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        发布时间：2021-03-12
      • CHU Hailin MAO Benjiang YANG Ruizhuang CHEN Haiyan XU Jian 1
        Issue 6, (2007)
        摘要：With toluene as an example, experimental investigation on VOCs treatment by electron beam irradiation was carried out. The system uses 0.8 MeV electron beams to irradiate simulated toluene-containing gases to 5kGy-40kGy for investigatiing effects of initial concentration, absorbed dose, humidity on toluene removal rate. The toluene removal rate increased with absorbed dose. With 0.5~1.2Nm3/h of the gas flow at an initial toluene concentration of 1600mg/Nm3, the toluene removal rate was 46.5% at 10kGy and 72.2% at 40kGy. And increasing humidity increased the toluene removal rate, too. Qualitative analysis on by-products of the toluene degradation was made by means of Gas Chromatogram-Mass Spectrometer (GC/MS) and Chromatography of Ions (IC). It was found that the by-products consist of mainly benzaldehyde and formic acid, plus a little benzoic acid, benzyl alcohol, methyl pyridine, nitrotoluene, o-cresol, phenol and benzoin ethyl etherl. Mechanisms of the E-beam toluene removal, i.e. the contributions of .OH free radicals and O2 to the oxidation of toluene, were discussed.  
        关键词：Electron beam;Volatile Organic Compounds (VOCs);Toluene;Mechanism   
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        发布时间：2021-03-12
      • QUAN Lin TU Jing CHENG Zhihua LIU Yueheng CHANG Yongfu
        Issue 6, (2007)
        摘要：Based on mechanisms of single energy photon interaction in an HPGe detector, the Monte Carlo Code method was used for simulating the energy response curves of single-energy photon in HPGe detector and characteristic parameters of the curves were abstracted. The theoretic response spectrum expression under different single energy incident photons was obtained by least-squares fit to the parameters. The theoretic expression was calibrated by experimental data with various kinds of gamma-ray sources. The corrected expression can provide reference for continuous photon spectrum unscrambling.  
        关键词：Photon spectrum;HPGe detector;Monte Carlo method;Simulation   
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        发布时间：2021-03-12
      • AO Qi WEI Yixiang WEN Xiangyang
        Issue 6, (2007)
        摘要：A new kind of DSP based digital multi-channel analyzer has been developed at Tsinghua University. By introducing a twin-FIFO structure in the hardware design, information of both rising edge and baseline level of digital signals can be obtained, the DSP bandwidth can be saved and the system throughput can be improved. The MCA system performs digital processing of nuclear signals in a DSP processor, and accomplishes the system monitoring and spectrum data transfer through USB (or serial) port. Energy spectra of 137Cs γ-rays,, measured by the MCA system with an SPEAR CdZnTe detector provided by eV Corp. were given as an example.  
        关键词：Digital multi-channel analyzer;Spectrum acquisition;Threshold discrimination;DSP;Nuclear signal processing   
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        发布时间：2021-03-12
      • SHENG Peng HU Chundong LIU Sheng SONG Shihua XIE Yahong
        Issue 6, (2007)
        摘要：A real-time feedback control system (RFCS) which is applied to control the gas supply of the ion source is introduced in this paper. The system consists of an A/D data acquisition card and a D/A output card, which are used as the data input and control output of the digital signal processing system. RTLinux OS which is compatible with the Linux kernel is adopted by the control application. The RTLinux is also optimized to reduce the size and provides good program developing environments and fulfills the control requirements. A flexible control algorithm is introduced to control the gas supply of the ion source. By the RFCS application, the experiment has firstly got the longest pulse by far: a stable discharging of the ion source lasting for 4.5s.  
        关键词：Real-time feedback control;RTLinux;Ion source;Digital signal processing   
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        发布时间：2021-03-12
      • LIU Shu ZHAO Jijiu WANG Chunhong
        Issue 6, (2007)
        摘要：According to demands of BEPCII construction and future operation, we are going to supply an open electronic logbook platform for people to record their message in developing and running BEPCII, and browse the logbook on website. That gives people an open and transparent logbook, rather than traditional paper notebook. With the template of DESY’s Elogbook, the BEPCII electronic logbook was developed, using the popular JSP technology to develop dynamic Web applications. This paper will introduce the development of BEPCII electronic logbook system.  
        关键词：BEPCII;Electronic logbook system;JSP;Web application;Java Servlet   
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        发布时间：2021-03-12
      • FENG Xiangqian1 FENG Songlin1 LI Jian’an2 LI Dejin3 1
        Issue 6, (2007)
        摘要：In order to distinguish provenance and age of Jianyao Kiln porcelains based on their chemical composition, 139 sherds that cover seven periods of production, were collected from three kiln sites. Trace and major elements in their body samples were determined by NAA and WDXRF, respectively. The analytical data and statistical analysis results show that all the body samples can be classified into 4 groups, i.e. Late Tang & Five Dynanties, Northern Song, Southern Song and Yuan. The raw materials adopted by Daluhoumen kiln site black porcelains were similar to those of Yingzhangqian site, but quite different from those of Anweishan site.  
        关键词：Jianyao Kiln porcelain;provenance;dating;NAA;WDXRF   
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        发布时间：2021-03-12
      • LIU Liangjun ZHOU jianliang MENG yecheng QIU shoukang XIAO Detao
        Issue 6, (2007)
        摘要：A radon concentration control system for a radon chamber (2.84m3) was developed. The radon concentration in the chamber can be controlled by adjusting air exhaust flow rate through the method of Pulse Width Modulation(PWM). A controlling cycle is 10 minutes, with a device to quickly supply and discharge radon. A solid radon source was used in the radon chamber. The system was controlled by computer. The equilibrium time of radon concentration was less than 4 hours. The stability of long time control was better than 2%.  
        关键词：Radon chamber;Radon concentration;Computer control   
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        发布时间：2021-03-12
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