最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Tongxuan1,2 ZHAO Zhentang11
        Issue 6, (2008)
        摘要：A cavity filter was developed for the SSRF 0-mode beam feedback.The filter is used to pick up the 500 MHz signal from the storage ring beam.The Superfish was used to simulate the model of the cavity bandpass filter.The design method,parameters of the filter and results of beam measurements are described in this paper.  
        关键词：Cavity bandpass filter;Quality factor;Resonance frequency   
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        发布时间：2021-03-12
      • MA Chenyan1 CUI Mingqi1 ZHAO Yidong1 ZHOU Kejin1 ZHU Jie1 ZHENG Lei1 ZHAO Jia1,2 SUN Lijuan1 CHEN Kai11
        Issue 6, (2008)
        摘要：A simple XAS apparatus was set up on BSRF-3B3 beamline.Measurements of S,P,Cl,Ca,Al and Mg K-edge XAS in their compounds have been carried out.The results show that it is feasible to do XAS research on 3B3 beamline under present condition.Efforts are underway to develop a more delicate medium XAS spectrometer,including transmission,fluorescence and electronic yield modes.According to our calculations,the experimental setup will satisfy the needs for XAS studies.This will help to develop medium X-ray absorption spectroscopy.  
        关键词：Medium X-ray;Beamline;X-ray absorption spectroscopy;Experimental setup;Sulfur   
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        发布时间：2021-03-12
      • YANG Song1,2 LENG Yongbin1 YAN Yingbing1,2 1
        Issue 6, (2008)
        摘要：The Shanghai Synchrotron Radiation Facility(SSRF) adopts Libera Electron from Instrumentation Tech-nologies as the main processor in beam position monitor(BPM) system.Some key features of the process,such as resolution,beam current dependency and fill pattern dependency,should be evaluated.In this paper,implementation of a Libera test system based on Virtual Instrument technology and EPICS is reported.LabVIEW was chosen as the software develop environment and a "LabVIEW CA Library" developed by SNS provided a cross platform CA inter-face between test routine and EPICS IOC inside Libera.The system has been applied to Libera acceptance test of the SSRF project.  
        关键词：EPICS;Libera;Virtual instrument;SSRF   
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        发布时间：2021-03-12
      • ZHU Weizhong1 WU Yanqing1 SHI Peixiong2 GUO Zhi1 TAI Renzhong1 XU Hongjie1 1
        Issue 6, (2008)
        摘要：In this paper,diffraction efficiency of SiO2 gratings was calculated based on the rigorous coupled-wave analysis,with normal incidence of a 13.4 nm(92.5 eV) EUV light on a grating of 140 nm period.It was found that the maximal first order diffraction efficiency of the SiO2 grating was much higher than the Si grating,and higher than the Cr/Si3N4 compound gratings currently used at PSI.A new method,which combines advanced silicon etching with silicon oxidation technology,was employed to make the SiO2 nano-grating with high aspect ratio.This method,for making the beam splitter grating especially,solves the problem of direct SiO2 etching and will be used for the soft X-ray interference lithography endstation at SSRF.  
        关键词：Soft X-ray transmission grating;Diffraction efficiency;Advanced silicon etching;Silicon oxidation technology;Rigorous coupled-wave analysis;Soft X-ray interference lithography   
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        发布时间：2021-03-12
      • SU Pengyuan12 HUANG Minghui12 FAN Hongmei1 MA Fei12 WANG Changhong1 GAN Zaiguo1 1
        Issue 6, (2008)
        摘要：A new tape transfer system is designed to collect and detect target nucleus.In this system,recycling tape is adopted to reduce the frequency of replacing the tape.The function of tape transport is improved so this system can detect a target nucleus which half-life is not shorter than 0.2 seconds.  
        关键词：Helium jet;Tape transport system;Capillary;Recycling tape   
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        发布时间：2021-03-12
      • ZHANG Jiayu WANG Huanyu ZHANG Chengmo YANG Jiawei LIANG Xiaohua WANG Jinzhou CAO Xuelei GAO Min CUI Xingzhu PENG Wenxi
        Issue 6, (2008)
        摘要：Basic design methods about the magnetic shield of an X-ray spectrometer for Chang’E Mission were introduced in this paper.The real magnetic field distribution was obtained through the measure experiment,and according to the measure results,the simulation to evaluate the magnetic shield effect was carried on.The results showed that the collimator can play a good role in magnetic shield to the electron.  
        关键词：X-Ray Spectrometer;Collimator;Magnetic shield   
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        发布时间：2021-03-12
      • WU Zhenkun1,2 ZHOU Weijian1,3 LIU Min2,3 YU Huagui1,4 PAN Caiwen2,3 KONG Xianghui1,4 LU Xuefeng1
        Issue 6, (2008)
        摘要：The classic procedure of BeO preparation for loess-paleosol cannot restrain the concentration of 10B effectively,which results in higher background of 10Be measurement.The procedure has been modified in this paper.It includes detailed eluting curve for cation exchanging,the method of converting Be(OH)2 to BeO,and the experiment equipments.The measurement results by Xi’an AMS indicate that the background of modified BeO preparation procedure can be lowered to 2.04×10-14 on 3MV AMS.The method and measurement results have also been introduced for Xi’an-AMS.  
        关键词：Loess;BeO;Accelerator mass spectrometer(AMS)   
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        发布时间：2021-03-12
      • ZHANG Guohui GUO Li’an ZHANG Jiaguo CAO Rongtai CHEN Jinxiang
        Issue 6, (2008)
        摘要：Activation method is not feasible for 64Zn(n,α)61Ni reaction cross section measurement because the residual nucleus 61Ni is stable.This leads to scanty of the experimental data for the 64Zn(n,α)61Ni reaction.By using a twin-gridded ionization chamber,differential and angle-integrated cross section data of the 64Zn(n,α)61Ni reaction were measured at neutron energies of 2.54,4.00,5.03,5.50 and 5.95 MeV.The experiment was performed on the 4.5 MV Van de Graaff accelerator of the Institute of Heavy Ion Physics,Peking University,China.Monoenergetic neutrons of 2.54 MeV were produced through the T(p,n)3He reaction with a solid Ti-T target,and those of the other four energy points were produced through the D(d,n)3He reaction with a deuterium gas target.The absolute neutron flux was determined through the 238U(n,f) reaction and a BF3 long counter was used as the neutron flux monitor.Results of present work are compared with other measurements and evaluations.  
          
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        发布时间：2021-03-12
      • HE Jun LI Meng GUO Liping LIU Chuangshen FU Dejun
        Issue 6, (2008)
        摘要：CdTe:Mn was prepared by 200 keV Mn ion implantation to a dose of 5×1016 cm–2,The results demon-strate that the CdTe:Mn possesses ferroelectricity.X-ray diffraction measurement showed that the Mn+-implanted layer maintained zinc-blend structure,but the full width at half maximum(FWHM) of the Mn peak increased from.48 arcsec of the pristine sample to 146 arcsec of the implanted sample.XPS spectrum of Mn 2p core levels showed that the main peaks of the Mn 2p3/2 and Mn 2p1/2 located at 640.8 and 652.4 eV,respectively.Since the Mn 2p3/2 core level spectrum for elemental Mn is at 639.0 eV,this reveals that in the CdMnTe samples the Mn atoms are bonded with other elements.CL spectrum showed that the energy gap of Mn+-implanted sample was 1.50 eV,which is larger than that of CdTe,indicating alloying of the sample and formation of CdMnTe.These results provide evidence for the ferroelectricity of CdMnTe,which is attributed to the difference between the radii of Mn2+ and Cd2+in the ternary compound of CdMnTe.  
        关键词：CdTe;Mn;Ion implantation;Cathodoluminescence   
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        发布时间：2021-03-12
      • WANG Xiangqi1 XU Yucun 1 FENG Deren1,2 HAO Hao1 PEI Yuanjie1 HONG Yining11
        Issue 6, (2008)
        摘要：The design of a beam-scan power-supply used in a 10 MeV linac E-beam irradiator is presented in this paper.The consideration of linear excitation current and principle of triangle wave modulator are included,control system based on single-chip and its anti-jamming scheme in industrial circumstance are introduced.A scanning magnet power-supply can produce continuous triangle waveform current,the frequency can be adjusted from 20 Hz to 50Hz in 1-Hz steps,and the peak-to-peak current is 20A.  
        关键词：Industrial radiation accelerator;Scanning;Triangle waveform;Single-chip   
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        发布时间：2021-03-12
      • LONG Jing1,3 ZHANG Hong1,2 LIU Yang1 ZHAO Weiping1,4 XIE Yi1,4 WU Zhenhua11
        Issue 6, (2008)
        摘要：To estimate reproductive risks of heavy ion irradiation and the possible mechanism,Kunming strain mice abdomen were exposed to 0,0.5,1,2 or 3 Gy of 12C6+ ions.The DNA content,percentage of each cell-cycle phase and the apoptosis rate were obtained with flow cytometry method.Lipid peroxidation indices,such as malondialdehyde(MDA) level and antioxidants,represented with superoxide dismutase(SOD) activity in the testes were determined by chemical reagent kids.The results showed that SOD activity enhanced slightly in the 0.5 Gy irradiation group(P>0.05),but decreased with increasing doses,and significant fall was observed in 2 and 3 Gy on groups comparing with the control(P<0.05).The MDA levels increased with the dose,and significant difference was found in the 2 and 3 Gy groups(P<0.05).The flow cytometry data showed that 1～3 Gy of 12C6+ ion irradiation resulted in significant decrease in haploid,diploid and tetraploid cells(p<0.01) and evidently increased apoptosis rate(p<0.01) in testes tissue.The G2/M phase arrest in irradiation groups were extremely obvious(p<0.01).The data suggest that 12C6+ ion irradiation can lead to testes cell high apoptosis rate and cell cycle alteration,which is possibly mediated through oxidative damage induced by over free radicals.The study may provide theoretical basis for application of antioxidants or radical scavengers on protecting gonads from damages during clinical radiotherapy.  
        关键词：12C6+ irradiation;Testis;Superoxide dismutase(SOD);Malonyldialdehyde(MDA);Flow cytometry method;Mouse   
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        发布时间：2021-03-12
      • HOU Suiwen1,2 SUN Landi2 ZHANG Yingcong2 WU Dali2 GUAN Liping2 LI Wenjian1 DANG Bingrong1 XIE Hongmei1 ZHOU Libin1 GAO Qingxiang21
        Issue 6, (2008)
        摘要：Dry seeds of Brassica napus were irradiated by 12C6+ ion beams with 30,90,and 180 Gy,and the mutagenic effects of M1 generation were investigated.In comparison to the control group,the irradiated seeds showed positive changes in emerged seedling rate,plant height and blooming rate,with obvious inhibitive effects on pollen vitality,1000-seed weight and seed oil content.The 30 Gy irradiation group outperformed the others in pods per plant and seed yield per plant.By means of RAPD method,the results showed specific bands,such as increasing bands,flawing bands and bands with different fluorescence intensity were observed in 13 primers selected.The variation rates under 30 Gy,90 Gy and 180 Gy 12C6+ irradiation were 22.1%,23.7% and 36.2%,respectively.The research is valuable to the application of 12C6+ heavy ion beam in improving Brassica napus breeding.  
        关键词：12C6+ heavy ion beam;Brassica napus;Biological effects;RAPD   
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        发布时间：2021-03-12
      • SONG Zhenfei QIN Ying HAO Shengzhi DONG Chuang WU Pingsheng ZHANG Xiangdong
        Issue 6, (2008)
        摘要：The axial symmetric temperature field model is introduced to describe the evolution of the temperature field during low energy(1～6 J·cm-2) ,high current(10～40 kA·cm-2) ,short pulse(1～6 μs) electron beam treatment.The simulation indicates that a sublayer about 0.12～0.24 μm in depth and 0～0.13 cm in radial distance in the substrate changes into liquidus state first,and craters are formed due to the liquid volume outbursts similar to the volcano eruption.The final melted layer is about 0.99 μm in depth and 2.01 cm in radial distance.The heating and cooling rates reaching 108～109 K.s-1 should be responsible for the observed grain refinement.  
        关键词：High current pulsed electron beam(HCPEB);Three dimensional temperature field;Simulation   
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        发布时间：2021-03-12
      • WANG Mingwei ZHANG Yingjian ZHANG Yongping YUAN Huiyu
        Issue 6, (2008)
        摘要：Hypoxia is a major inherent characteristic for the most of solid tumors and produces severe treatment resistance to radiotherapy and chemotherapy of tumors and often results in poor prognosis.1-H-1-(3-18F fluoro-2-hydroxypropyl)-2-nitroimidazole(18F-FMISO)is a specific hypoxia imaging agent and has been applied into clinic to evaluate tumor hypoxia status and guide treatment plan of radiotherapy and chemotherapy by PET/CT.A new automated synthesis procedure of 18F-FMISO was developed by modifying the Explora FDG4 module and taking 1-(2’-nitro-1’-imidazolyl)-2-O-tetrahydropyranyl-3-O-tosyl-propanediol as labeling precursor in this study.Two-pot reaction was adopted to assure good separation of the final product via solid phase extraction based upon combined Sep-pak cartridges instead of HPLC.This fast reliable preparation route of 18F-FMISO could be completed in about 50 min with about 55% of radiochemical yield and over 98% of radiochemical purity.  
        关键词：18F-FMISO;Hypoxia;FDG4 module;Automated synthesis   
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        发布时间：2021-03-12
      • DONG Li XU Dongmei HONG Jun GONG Peijun YAO Side
        Issue 6, (2008)
        摘要：To study the feasibility of using polyethyleneimine nanoparticles(M-PEIs) prepared by radiation polym-erization as gene deliver,the cytotoxicity of M-PEIs was evaluated by MTS assay.The efficiency of short hairpin RNA(shRNA) transfection and its suppression of the targetted gene expression were investigated by RT-PCR and Western Blotting.It was found that the M-PEIs/shRNA complexes exhibited low cyto-toxicity in HCC.M-PEIs/shRNA also suppressed the target gene expression in liver cancer cell HepG2.The results indicate that M-PEIs have potential as a shRNA delivering agent and can be applied for anti-angiogenic tumor therapy.  
        关键词：Radiation preparation;Polyethylenimine;Gene deliver;shRNA   
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        发布时间：2021-03-12
      • SHA Miaomaio1,2 LIU Weihao2 CHEN Yong2 JIANG Dazhen31
        Issue 6, (2008)
        摘要：Hadamard transform can improve the SNR by increasing the ion duty cycle in IMS.In this paper,the ion spectral signals were processed by Hadamard transform based on the IMS detector hardware platform.The results showed that Hadamard transform can greatly improve the SNR of the IMS detector in contrast with traditional method.  
        关键词：IMS(Ion mobility spectrometry);Hadamard transform;Duty cycle;SNR(Signal-to-noise Ratio)   
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        发布时间：2021-03-12
      • ZHANG Yuan LEE Shiming CHEN Nan ZHU Jinbo Hsia Yuanfu
        Issue 6, (2008)
        摘要：FPGA(Field Programmable Gate Array) is a programmable device with strong logical function and timing control ability.It is extremely potent in acquiring and processing timing signals.By replacing the traditional used SCM(Single-Chip Microcomputer) with FPGA,counting speed of Mssbauer spectrometric data acquisition can be improved markedly with significantly decreased size of the spectrometer.The counter,RAM and RS-232 communi-cation of the module are developed on Altera Cyclone series chip EP1C6T144C8 with Quartus Ⅱ.EP1C6T144C8 has 5980 logical units accompanied by 92160 bits of memory space.It is so powerful that all needs in data acquisition of the Mssbauer spectrometer can be perfectly satisfied while allowing modifications in functions and parameters.  
        关键词：FPGA;Counter;RAM;Serial communication   
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        发布时间：2021-03-12
      • WU Ming1,2 SU Hong1 PENG Yu1,2 LI Xiaogang1 MA Xiaoli1 QIAN Yi1,2 LIU Yicai1,2 1
        Issue 6, (2008)
        摘要：The circuit for front-end electronics for neutron detection wall based on CPLD,which can deal with the output signal of the neutron detection wall in IMP,is introduced in this paper.An improved circuit design is proposed for front-end read-out electronics of neutron detection wall detector.The system consists of coincidence unit,QAC unit,TAC unit,and multiplexer unit etc.We use CPLD to construct the main circuit in the design.Compared with the circuits constructed by separate devices,the new circuit has features such as the DMOS switch used,higher precision,less components,lower cost and lower dissipation.The circuit we developed can be widely used in nuclear measurement system of physics experiment with large-scale detector array to form front-end read-out electronics of data acquisition system.  
          
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        发布时间：2021-03-12
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