最新刊期
      卷 0 ， 期 0 ， 2020
      • MI Qingru ZHENG Lifang LIU Songqiang
        Issue 1, (2008)
        摘要：This paper describes a software development environment,which is used in EPICS-based control system on a large scientific facility.Correspondingly,a developing service platform is set up.The platform is uniform,con- venient and reliable.And it can not only manage the design and the test on EPICS software efficiently,but also ensure EPICS system reliability and maintainability.  
        关键词：EPICS(Experimental Physics and Industrial Control System);Directory structure;Account management;Version control   
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        发布时间：2021-03-12
      • WU Jinjie~
        Issue 1, (2008)
        摘要：An easy method is studied to test TOF electronics by PMT signal,which is more near the real situation than signal generator.The test results show that the TOF electronics prototype has met the requirements of the TOF detector.  
        关键词：BESIII;Time of flight;Electronics;Time resolution;Charge resolution   
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        发布时间：2021-03-12
      • JIANG Bingyao~1 FENG Tao~2 REN Congxin~1 LIU Xianghuai~1 1
        Issue 1, (2008)
        摘要：Low energy ion beam assisted deposition(IBAD)was employed to prepare Cu,Ag or Pt films on Mo/Si(100)substrate.When the film deposition was performed with simultaneous bombardment of 500 eV Ar ion beam normal to the film surface at ion/atom arrival ratio of 0.2,the prepared Cu films were(111)preferred orientation, Ag and Pt films were(111)and(200)mixed orientations.When the Ar ion beam was off-normal direction of the film surface 45°,the prepared Cu,Ag and Pt films all exhibited highly preferred(111)orientation.Monte Carlo method was used to calculate the sputtering yields of Ar ions incident on single crystal Ag(100)and(111)plane at various in- cident angles and azimuth angles respectively.The effects of channeling effects and surface free energy on the crys- tallographic texture of Cu,Ag and Pt films are discussed.  
          
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        发布时间：2021-03-12
      • CHENG Feng~
        Issue 1, (2008)
        摘要：CsI films were prepared on glass substrates by thermal evaporation and annealed under various tempera- ture.Structure and scintillation properties of films were examined using X-ray diffraction,scanning electron micro- scope and scintillation pulse height spectrometry.The results show that the crystalline structure and scintillation properties of the CsI films depend on the annealing temperature.The samples annealed at 250℃have a good crystal- line state and scintillation properties.As the annealing temperature goes up to 400℃,the light output of samples de- creases seriously.  
        关键词：CsI films;Thermal evaporation;Scintillation properties   
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        发布时间：2021-03-12
      • HE Yujuan~1 SHI Qian~1 LUO Hongwei~1 EN Yunfei~1 ZHANG Xiaowen~1 LI Bin~2 LIU Yuan~
        Issue 1, (2008)
        摘要：Bias voltage applied to MOSFET during irradiation has a major impact on the device response because charge yield,transport,and trapping in oxide are all bias dependent.NMOSFET and PMOSFET under different fre- quency of dynamic bias were irradiated by 10 keV X-rays to study the total dose effect.The shifts of threshold volt- age of the MOSFETs before and after irradiation and effects of the radiation-induced charge on the threshold voltage of MOSFETs are analyzed in this paper.The results showed that the higher the frequency of pulse signal is,the less threshold shift and concentration of the radiation-induced charge were observed at the same pulsed voltage.  
        关键词：X-ray;Total-dose irradiation effect;Radiation bias;Frequency   
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        发布时间：2021-03-12
      • MA Qingli~1 TANG Shibiao~2 HU Bingquan~3 JIANG Min~3 ZENG Daimin~3 FANG Zhenyun~3 1
        Issue 1, (2008)
        摘要：Point spread function(PSF)of a pinhole imaging system with plastic scintillation fiber and Nal array de- tectors to detect 6 MeV neutrons was simulated using Monte-Carlo method.By fitting the simulation data with Gauss function,PSFs and their corresponding modulate transfer functions(MTF)of the pinhole imaging system were ob- tained.The results show that the system of plastic-scintillating fiber array detector has much better spatial resolution and imaging quality than the NaI system.  
        关键词：Pinhole imaging;The point spread function(PSF);Modulate transfer function(MTF);GEANT4   
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        发布时间：2021-03-12
      • CHENG Changming TANG Deft ZHAO Jie
        Issue 1, (2008)
        摘要：Configuration and working principle of a DC non-transferred plasma torch have been introduced.Con- nections between the electric-thermal characteristics and operational parameter such as flowing gas flow rate and arc power have been investigated.Influence of high-speed lateral gas on jet figure has been analyzed synchronously.The results indicate that anode geometry affect plasma jet characteristics strongly.Arc voltage drops when the compressed angle increase;the stability of jet with less compressed angle is better;rigidity of jet with less anodic diameter is stronger.Plasma torches with different anode have respective applied fields.  
        关键词：Plasma torch;Plasma jet;Anodic compressed angle;Current-voltage characteristics   
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        发布时间：2021-03-12
      • ZHAO Huijie~1 HE Shiyu~1 XIAO Zhibin~2 SUN Yanzheng~2 XIAO Jingdong~1 ZHANG Yijun~1 1
        Issue 1, (2008)
        摘要：The paper studies spectral response of GaAs/Ge solar cells irradiated to 1.0×1011-3.0×1012cm-2by 100 keV protons,or irradiated to 3.0×1012cm-2by 50-170 keV protons.The results show that proton irradiation in- duces a great damage in optical characteristics of the solar cell,resulting from the large quantity of irradiation defects that would destroy crystal lattice integrity and reduce the diffusion distance of minority carrier,and thus increase the surface recombination velocity.The damage extent of GaAs/Ge solar cell increases with proton energy and dose in their ranges under investigation.  
        关键词：GaAs/Ge solar cell;Proton irradiation;Spectral response   
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        发布时间：2021-03-12
      • YANG Zhihu~1 ZHU Kexin~1 ZHANG Xiao’an~
        Issue 1, (2008)
        摘要：Spectra of the ionized oxygen atoms were studied by pro-500i monochromator equipped with CCD.The beam foil method was used with 2 MeV oxygen ion beams.In this paper,we report 182 spectral lines determined in the 350-450 nm region.Most of the spectral lines were attributed to n,1 energy level transitions from OII to OIV atoms.The experimental results are in good agreement with available theoretical results.The 28 lines were found for the first time,and a majority of the spectral lines attribute to week transitional lines.  
        关键词：Tandem accelerator;Oxygen ions;CCD(Charge Coupled Device);Spectra   
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        发布时间：2021-03-12
      • YANG Bingfan GUAN Xialing CAO Xiaoping ZHANG Tianjue LI Zhenguo CHU Chengjie CUI Baoqun ZHOU Lipeng PENG Zhaohua BAO yiwen TANG Hongqing WU Haicheng
        Issue 1, (2008)
        摘要：A project has been in progress at CIAE(China Institute of Atomic Energy)to upgrade the HI-13 tandem accelerator into the Beijing Radioactive Ion-beam Facilities(BRIF).On upstream of the tandem,a 100 MeV/200μA proton cyclotron(CYCIAE-100),acting as a driver,and an isotope separator on line(ISOL)with a mass resolution of 20000,are to be built;while a superconducting linac booster(SCB)with an energy gain of 2 MeV/q is to be added to down-stream of the tandem.The proton beam from CYCIAE-100 bombards target-source on the ISOL to produce ra- dioactive ion-beam,which is accelerated by the HI-13 tandem and the booster for experiments.  
        关键词：Tandem accelerator;Cyclotron;Isotope separator on line;Superconducting linac booster;Radioactive ion-beam   
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        发布时间：2021-03-12
      • LIU Yunhong~
        Issue 1, (2008)
        摘要：GaInP/GaAs/Ge multi-junction solar cells fabricated by metal-organic chemical vapor deposition （MOCVD）technique were irradiated by 1×1012cm-2protons of 0.28,0.62 or 2.80 MeV.The performance degradation in current-voltage（I-V）characteristics and spectral response of the solar cells was analyzed.The largest degradation rates of short circuit current(Isc),open circuit voltage(Voc),and maximum power output(Pmax)was observed with proton beams of the lowest energy.Also it was observed that degradation of the spectral response reduced with in- creasing proton energy.And the spectral response of the GaAs middle cell degraded more than the GaInP top cell. Thus,the radiation tolerance of the multi-junction solar cells is primarily controlled by the degradation of the GaAs middle cell.  
        关键词：GalnP/GaAs/Ge solar cell;Proton irradiation;Spectral response   
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        发布时间：2021-03-12
      • WEN Xinzhu WANG Yuxin CHEN Zhenying HUANG Yuyang DENG Wen
        Issue 1, (2008)
        摘要：The background of the spectrum of Doppler broadening of positron annihilation radiation can be reduced remarkably by using a two-detector coincidence technique.With this setup,we get a peak to background ratio of about 104 on the high energy side of the peak.The d electron and f electron signal for the transition metals can be extracted from the coincidence Doppler broadening spectrum.The coincidence Doppler broadening spectra for the transition metals Zr,Nb,Mo,Ag,Hf,Pt,Au and single crystal of Si have been measured.The experimental results show that the height of the peak of the ratio curves(the reference sample is Si)for the transition metals Zr,Nb,Mo, Ag increases with the increase in the number of 4d electrons.There are 2 peaks in the ratio curves(the reference sam- ple is Si)for the transition metals Ag,Hf,Pt.And the height of the peaks increases with the increase in atomic num- ber.  
        关键词：Positron annihilation;Coincidence techniques;delectrons;felectrons;Transition metal elements   
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        发布时间：2021-03-12
      • WEI Zengquan~
        Issue 1, (2008)
        摘要：Development and initiation of treating tumor with heavy ion beams in China is briefly reviewed at first. Medical facility and some key techniques of tumor therapy with heavy ion beams are emphatically discussed,such as general layout,models of beam extraction,beam delivery system,rotating gantry,gated irradiation system synchro- nized with respiratory motion and PET imaging.  
        关键词：Heavy ion beams;Tumor treatment;Beam extraction;Beam delivery;Gated control system;PET imaging   
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        发布时间：2021-03-12
      • PANG Hongchao~1 LUO Shunzhong~2 LONG Xinggui~2 AN Zhu~1 LIU Ning~1 DUAN Yanmin~1 WU Xingchun~2 PENG Shuming~2 YANG Benfu~2 WANG Peilu~1 SONG Yingmin~1 ZHENG Sixiao~1 1
        Issue 1, (2008)
        摘要：Helium-charged nanocrystalline titanium films were deposited by He-Ar magnetron sputtering.The he- lium content,microstructure and average grain size of the nanocrystalline titanium films were studied by PBS(proton backscattering)and XRD(X-ray diffraction).The results indicated that under the same deposition parameters except the substrate temperature,which increased from 60℃to 350℃,the helium content decreased gradually from 38.6%to 9.2%and the grain size increased from 13.1 nm to 44.2 nm.When the flux ratio of He/Ar was 6,10,15 and 19,he- lium content of the films was 17.6%,47.2%,48.3%and 38.6%,respectively.The Bragg peak of(002)crystal plane in the film had a slight shift to of the left comparing with that of the pure Ti film,while Bragg peak of(100)crystal plane did not change.This indicated that the lattice parameter c increased but the lattice parameter a remained the same.With increasing helium content in the film,the diffraction peaks broadened and grain sizes decreased.These further indicated that the incorporation of helium has an inhibition function to the grain growth of the film.  
        关键词：Magnetron sputtering;Nanocrystalline titanium film;Grain size;Helium content   
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        发布时间：2021-03-12
      • GUO Honglei~1 GONG Peirong~1 LIU Ping~1 WANG Jun~1 LIN Yechun~2 1
        Issue 1, (2008)
        摘要：An EBS(electron beam system)accelerator was developed for radiation vulcanization of rubber latex. This paper describes hardware and software design of the power supply control system.In test of the accelerator,the HV power supply provides 350 kV output without load.  
        关键词：Electron curtain accelerator;Power supply;PLC   
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        发布时间：2021-03-12
      • WANG Jian XIE Shuxin DONG Jian WANG Qingqi YU Xiaoqi JIN Ge
        Issue 1, (2008)
        摘要：Design and implementation of Win32-based EPICS IOC are discussed in this paper.Some approaches for integrating EPICS IOC and Microsoft technologies are proposed.Some high performance oscilloscopes are devel- oped as EPICS IOCs and work well with the whole EPICS control system.  
        关键词：EPICS(Experimental Physics and Industrial Control System);IOC(Input/Output Controller);DLL;COM;ActiveX control   
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        发布时间：2021-03-12
      • LIANG Ping~1 TANG Shibiao~2 JIANG Lianjun~2 YAN Ji~2 LIANG Fei~2 YIN Zejie~2 1
        Issue 1, (2008)
        摘要：HL-2A is China’s first Tokamak device with divertor configuration.Mastering the process and plasma parameter changes with time are of great significance to achieve controlled nuclear fusion.In the recent upgrading of HL-2A,for which a higher and faster electronic equipment was required,we developed a new type USB multi-channel time division scaler for HL-2A including functions:USB interface,PC graphical user interface,simul- taneously calibrating more than five channel signals,optional time division spacing 2-50 ms,count rate up to over 2 MHz,accessing all the information 20 s after a activated signal,and processing data and displaying off-line.  
          
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        发布时间：2021-03-12
      • ZHAO Cuilan PU Shijie
        Issue 1, (2008)
        摘要：Principles of a spectroscopic amplifier designed for CdZnTe detectors is introduced in this paper.Com- paring to conventional spectroscopic amplifiers,the amplifier has better performance in terms of energy resolution and stability under high counting rate.The amplifier is also suitable for Si(Li)detectors,proportional tubes and scin- tillation detectors.  
        关键词：Spectroscopy amplifier;CdZnTe detector;Base line restorer;Energy resolution   
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        发布时间：2021-03-12
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