最新刊期
      卷 0 ， 期 0 ， 2020
      • CUI Baoqun LI Liqiang MA Yingjun ZHU Shengyun JIANG Chong DENG Jinting WANG Rongwen JIANG Weisheng
        Issue 2, (2006)
        摘要：The production of radioactive 62Zn ion beam with HI-13 tandem as primary accelerator is described. The configuration of the target and the tuning of the radioactive ion beamline are introduced. A radioactive 62Zn ion beam with intensity in the order of 106 /s at 25 keV has been generated on line. Also the production efficiency of 62Zn is estimated. The radiation level in the set-up area after the experiment is reported.  
        关键词：62Zn;Radioactive ion beam;Target   
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        发布时间：2021-03-12
      • SUN Liangting ZHAO Hongwei ZHANG Zimin WANG Hui MA Baohua LI Xixia ZHANG Xuezhen MA Xinwen
        Issue 2, (2006)
        摘要：An all-permanent magnetic electron cyclotron resonance (ECR) ion source LAPECR2 (Lanzhou all-permanent ECR ion source No.2) is being developed in Lanzhou. This ion source is believed to be a larger and heavier all-permanent magnetic ECR ion source in the world, which provides very high magnetic field inside the working volumn. This ion source will work on the IMP (Institute of Modern Physics) 320kV high voltage platform and provide intense high charge state ion beams for the successive experimental terminals. Many innovative methods have been adopted in the magnet design of LAPECR2. Due to the adoption of high remanence NdFeB material, optimum design and accurate calculation, the measured magnetic parameters are well up to the requirements of a high performance 14.5GHz ECR ion source. An off-axis rectangular wave-guide is used to feed 14.5GHz microwave inside the plasma chamber to heat the plasma. The adoption of off-axis RF feeding method will make the plasma more stable and the RF power feeding more efficient. Additionally, many tricky techniques such as the aluminum liner inside the plasma chamber, the biased-disc, the aluminum plasma electrode, the triode extraction system, the addition of auxiliary gas, etc, are employed to increase the production efficiency of high charge state ions.  
        关键词：ECR ion source;Permanent magnet;High charge state   
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        发布时间：2021-03-12
      • SONG Zhizhong YU Jinxiang GUO Zhiyu PENG Shixiang MING Jianchuan YUAN Zhongxi WANG Zhongyi
        Issue 2, (2006)
        摘要：The progress of a 2.45 GHz compact microwave ion source with permanent magnet was introduced in this paper. The source outline dimension is Φ100mm×100mm, and its weight is less than 5 kg. It can operate in both pulse and CW mode. At 500 W microwave power, 45 kV extraction voltage and 5 mm of diameter of emittance hole on the plasma electrode, 100 mA peak current of hydrogen ion beam was extracted in pulse mode, corresponding to a beam density of 500 mA/cm2; at the same conditions 60 mA hydrogen ion current was extracted and beam density was 300 mA/cm2 in CW mode. The proton ratios were about 80% and emittances Erms were less than 0.17πmm·mrad in both modes.  
        关键词：Permanent magnet;Microwave ion source;High current;Proton   
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        发布时间：2021-03-12
      • WU Xianying ZHANG Xiaoji LI Qiang ZHANG Shengji ZHANG Huixing LIU Andong
        Issue 2, (2006)
        摘要：Gibbous extraction electrode for MEVVA ion source is introduced. It is indicated that gibbous extraction electrode can be used to force the ion beam spreading widely like a convex. So intenser ion beam and larger uniform beam spot can be obtained in smaller extraction area and shorter extraction distance. Gibbous extraction electrode which can meet the demand of applications was got by experimentally comparing several different structures of electrode.  
        关键词：MEWA ion source;Extraction electrode;Ion beam distribution   
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        发布时间：2021-03-12
      • XIANG Wei Spdtke P Hollinger R Galonska M Heymach F
        Issue 2, (2006)
        摘要：To generate uranium ion beam with high current and high brightness to meet the requirement of the heavy ion synchrotron at GSI, KOBRA3-INP code has been used to simulate the behavior of the uranium ion beam in the extraction system and the post-acceleration system for a metal vapor vacuum arc ion source. The influence of the emission current density on the characteristics of the extracted ion beam is discussed. The results show that the losses of the extracted ion beam propagating through the beam line mainly occur in the drift space between the extraction system and the post-acceleration system. Simulation quantitatively supports the experimental results under the assumption that the ion beam has to be space charge compensated along the drift sections. Intensity of the ion beam behind the post-acceleration system is not sensitive to the emission current density in the range from 180 to 230 mA/cm2.  
        关键词：MEWA ion source;High current uranium beam;Post-acceleration system;Numerical simulation   
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        发布时间：2021-03-12
      • MING Jianchuan WANG Jinhui GUO Qiqian WANG Liangming ZHU Qiliang BAI Yulan DING Jia GUO Zhiyu YU Jinxiang SONG Zhizhong ZHU Kun
        Issue 2, (2006)
        摘要：The calculation of permanent magnet for ECR ion source with Poisson code has been completed and compared with the experiment results. Based on the calculation, a permanent magnet made of NdFeB has been designed, which is availed to get high current ion beam with the ECR ion source.  
        关键词：Permanent magnet;ECR ion source;High current ion beam   
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        发布时间：2021-03-12
      • MING Jianchuan YUAN Zhongxi PENG Shixiang SONG Zhizhong YU Jinxiang GUO Zhiyu SONG Xiangxiang ZOUYubin ZHU Kun
        Issue 2, (2006)
        摘要：A high-current ion beam emittance measurement unit (EMU) based on slit-wire method was introduced. The construction and the design’s key-points of the EMU were discussed. The measurement results of emittance of the electron cyclotron resonance (ECR) proton source at Peking University were given and discussed.  
        关键词：High-current;Ion beam;Emittance;Slit-ware method   
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        发布时间：2021-03-12
      • TANG Pingying DAI Jingyi TAN Xiaohua XIANG Wei SHI Lei
        Issue 2, (2006)
        摘要：Spectrum diagnosis, as an important experimental method, is convenient and irreplaceable in ion source investigation. As a non-contact plasma diagnosis method, it can measure and estimate the plasma parameters of ion source rapidly without disturbing ion source discharge. Several typical applications of spectrum diagnosis used in ion source studies are introduced in this paper.  
        关键词：Ion source;Plasma;Spectrum diagnosis   
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        发布时间：2021-03-12
      • ZENG Xianxian WU Baoshan LU Jie
        Issue 2, (2006)
        摘要：Chinese scientists discovered the biological effect of ion beam implantation in the 1980s, and applied this method to the mutation breeding. The article gives a brief introduction to the theory of ion beam bio-technology, the biological effect of low energy ion beam and the progress of studies on ion beam bio-engineering in Xinjiang.  
        关键词：Ion implantation;Mutation breeding;Application   
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        发布时间：2021-03-12
      • TAN Jun CAI Zhihai ZHANG Ping
        Issue 2, (2006)
        摘要：Cubic boron nitride (c-BN) films were deposited on the high speed steel (HSS) substrate implanted with boron ion by RF-magnetron sputtering. The films were analyzed by IR, XPS and AFM. The experiment results show that the implantation of boron ions into silicon substrate can reduce the internal stress of films, and when the boron dose is appropriate, the implantation of boron into HSS substrate will be helpful to synthesize c-BN phase and reduce the internal stress of films. AFM shows that the surface roughness of the c-BN film on the implanted HSS is lower and the grain size is smaller. Besides, the phase structure of the boron implanted layer was analyzed by XPS, and the influence of boron implanted layer on the growth of c-BN films was investigated.  
        关键词：Cubic boron nitride film;High speed steel substrate;Ion implantation;RF-magnetron sputtering   
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        发布时间：2021-03-12
      • ZHANG Ping CAI Zhihai DUYuehe TAN Jun
        Issue 2, (2006)
        摘要：The multiphase nano-commposite coatings consisting of nanocrystalline TiN and amorphous Si3N4 were deposited on silicon substrate by means of ion beam assisted deposition. The influences of current density, ion energy, the area ratio of Ti to Si on microhardness of TiN/Si3N4 films were studied. Both composition and structure of the composite films were analyzed by nanoindenter, XPS and XRD. The surface morphology of the TiN/SiN4 films was observed by AFM. Then the growth mechanism of TiN/Si3N4 films was discussed.  
        关键词：Ion beam assisted deposition;Superhard nanocomposites;TiN/Si3N4 films   
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        发布时间：2021-03-12
      • YAN Sha LE Xiaoyun ZHAO Weijiang WANG Yugang XUE Jianming
        Issue 2, (2006)
        摘要：The mixing effect of three different film/substrate systems, Ti/Al, Al/Ti and Ni/Ti, which were irradiated by intense pulsed ion beam, was studied with Rutherford backscattering spectroscopy (RBS). It was found that a quite well mixed layer with gradient components was formed in Ni/Ti combination. The thickness of the mixing layer is far beyond the ion range. They were mixed probably in molten state. It was also found that the mixing degree strongly related to the difference of the melting points of film/substrate couple, as well as the difference of the surface tensions.  
        关键词：Intense pulsed ion beam;Ion beam mixing;Rutherford backscattering spectroscopy   
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        发布时间：2021-03-12
      • LE Xiaoyun YAN Sha LIU Zhijian ZHAO Weijiang
        Issue 2, (2006)
        摘要：As intense pulsed ion beam (IPIB) irradiates the surface of target material, a series of processes such as fast heating, melting, vaporizing, ablating, and rapid resolidifying will be induced and then shocks generated. We have measured the Shockwaves induced by IPIB irradiation successfully by setting up and improving our PVDF detecting system. Experimental results are in good accordance with theoretical calculations.  
        关键词：Intense pulsed ion beam (IPIB);Shock;Polyvinylidene fluoride (PVDF)   
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        发布时间：2021-03-12
      • LIU Jinhe HU Meijuan WANG Hui
        Issue 2, (2006)
        摘要：The vacuum electron beam welding of SiC particle reinforced aluminum matrix composites has been carried out initially. The experiment results show that the larger the electron beam current is, the deeper the penetration is, while the quicker the welding speed is, the shallower the penetration is. The interface reaction between SiC particle and liquid aluminum occurs, the Al4C3 brittle phase is generated during welding process and vaporizing of magnesium will lead to the generation of weld porosity.  
        关键词：Aluminum matrix composites;SiC particles;Vacuum electron beam welding   
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        发布时间：2021-03-12
      • FU Pengfei LIU Fangjun FU Gang MAO Zhiyong
        Issue 2, (2006)
        摘要：In order to improve the joint’s properties, local heat treatment of TC4 titanium alloy with electron beam was conducted. After electron beam local heat treatment, residual stresses of weld were tested by the X-ray method. Compared with EBW, the martensite grains of weld become finer after electron beam local heat treatment, and residual stress distribution of TC4 titanium alloy joints is improved.  
        关键词：Electron beam;Local heat treatment;TC4 titanium alloy;Residual stress   
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        发布时间：2021-03-12
      • FANG Jiaxun YAN Xueqing GUO Zhiyu LI Weiguo GUO Jufang YU Maolin LU Yuanrong GAO Shuli YU Jinxiang SONG Zhizhong REN Xiaotang CHEN Jiaer
        Issue 2, (2006)
        摘要：RFQ accelerators are very suitable for the ion implantation at the energy level of MeV. They have the advantages such as strong beam current, small size, convenient use, ion source at ground potential and simultaneous acceleration of both positive and negative ions. In the paper, the development, situation and the principle of RFQ accelerators, the structure and performance of 1.0 MeV RFQ accelerator at Peking University and a new type of RFQ-SFRFQ combined accelerator are introduced.  
        关键词：Radio frequency quodrupole (RFQ);Integrated split ring RFQ;Separated ruction RFQ;Ion implantation   
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        发布时间：2021-03-12
      • LIU Zhitao ZHANG Huayi HE Huilin SUN Zhichao
        Issue 2, (2006)
        摘要：Several kinds of paper such as newsprint, duplicating paper, brown paper and writing paper were irradiated by electron beam with different doses. Some physical properties were measured. When irradiated by 20-30 kGy, less than 25% of changes occurred on base weight, brightness, tear resistance, tensile strength and folding endurance for duplicating paper, showing that the paper kept at B level after the irradiation. The results are analyzed, and the mechanism of radiation effects is discussed.  
        关键词：Paper;Radiation effects;Tear resistance;Tensile strength;Folding endurance;Chromaticity   
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        发布时间：2021-03-12
      • HU Liqun ZHANG Xiaodong YAO Ruohe
        Issue 2, (2006)
        摘要：High energetic neutral particle beam injection (NBI) is one of most important methods for core auxiliary heating and non-inductive current drive of plasma in nuclear fusion devices. Based on the requirements of present National Science Mission-EAST (experimental advanced superconducting tokamak) system, an NBI project with delivery power up to 8 MW was proposed and the related consideration both on engineering and physics was on the way. The project of the EAST NBI is presented in this paper, including requirement of physics and engineering, estimation of the neutral beam transmission in the EAST plasma, etc.  
        关键词：Neutral beam injection;Beam transmission;Experimental advanced superconducting tokamak (EAST)   
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        发布时间：2021-03-12
      • YU Shiji ZHANG Jialiang DING Zhenfeng MA Tengcai
        Issue 2, (2006)
        摘要：Diamond-like carbon (DLC) films were prepared by inductively coupled plasma enhance chemical vapor deposition (ICPECVD). Optical emission spectroscopy (OES) was applied to the analysis of different radicals in the process. The deposition rate and microhardness of DLC films were tested. The result shows that more ionic hydrocarbon radicals exist in methane plasma which is excitated by inductively coupled plasma source, so the hard DLC films are formed. Both RF power and pressure have distinct influence on radical’s species and proportion in the DLC films deposition process, and the film’s quality is affected finally.  
        关键词：Inductively coupled plasma enhance chemical vapor deposition (ICPECVD);Diamond-like carbon films;Optical emission spectroscopy;Radical   
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        发布时间：2021-03-12
      • DAI Junfeng ZHAO Ziqiang ZHAI Jin JIANG Lei
        Issue 2, (2006)
        摘要：In our experiment, MeV C1+ ions and C2+ cluster ions were used to irradiate PC films. Through analyzing the absorption spectra of PC films, we have found that the ion implantation can result in the key break and flaw near the surface of the polymer. These changes alter the property of optical absorption of PC films and lead to obvious absorption in the range of visible light, which show that the absorption limit is closely related to the species, energy and fluence of the injecting ions. The XPS analysis of composition and structure of near surface of PC further verifies this conclusion.  
        关键词：Cluster ions;Ion implantation;Optical absorption;X-ray photoelectron spectroscopy (XPS)   
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        发布时间：2021-03-12
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