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Performance of the plugged-in ^(22)Na based slow positron beam facility

Chinese Physics C 2008年第3期32卷 243-246页

作者：王平马雁云秦秀波张哲曹兴忠于润升王宝义 Key Laboratory of Nuclear Analysis Techniques Institute of High Energy PhysicsCASBeijing 100049China Graduate University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Nuclear Analysis Techniques Institute of High Energy PhysicsCASBeijing 100049China

The Beijing intense slow positron beam facility is based on the 1.3 GeV linac of Beijing Electronpositron Collider （BEPC） aiming to produce mono-energetic intense slow positron beam for material science investigation. The plugged-in 22Na based slow positron beam section has been newly constructed to supply continuous beam time for the debugging of positron annihilation measurement stations and improve the Beijing intense slow positron beam time using efficiency. Performance testing result of the plugged-in 22Na based slow positron beam facility are reviewed in this paper, with the measurement of the beam transport efficiency, the view of beam spot, the adjustment of beam position, the measurement of beam intensity and energy spread etc. included.

关键词： slow positron beam transport efficiency beam intensity energy spread

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Thickness Impacts of Vacancy Defects in Epitaxial La0.7Sr0.3MnO3 Thin Films Using slow positron beam

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Chinese Journal of Chemical Physics 2010年第6期23卷 685-688,746页

作者：刘建党成斌杜淮江叶邦角中国科学技术大学近代物理系合肥230026

Thickness effects of thin La0.7Sr0.3MnO3 （LSMO） films on （LaAlOa）0.3（Sr2AlTaO6）0.7 substrates were examined by a slow positron beam technique. Doppler-broadening line shape parameter S was measured as a function of thickness and differnt annealing conditions. Results reveal there could be more than one mechanism to induce vacancy-like defects. It was found that strain-induced defects mainly influence the S value of the in situ oxygenambience annealing LSMO thin films and the strain could vanish still faster along with the increase of thickness, and the oxygen-deficient induced defects mainly affect the S value of post-annealing LSMO films.

关键词： Thin film Giant magnetoresistance slow positron beam Defect

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Investigation of Defects Induced by Helium and Hydrogen Implantation in CLAM Steel by a slow positron beam

Investigation of Defects Induced by Helium and Hydrogen Impl...

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9th International Conference on Computer Simulation of Radiation Effects in Solids

作者： J.Qiu~1 Y.Xin~1 X.Ju~(1*) L.P.Guo~2 B.Y.Wang~3 Y.R.Zhong~3 Q.Y.Huang~4 Y.C.Wu~4 1 Department of Physics University of Science and Technology Beijing Beijing 100083 China 2 Accelerator Laboratory School of Physics Wuhan University Wuhan Hubei 430072 China 3 Key Laboratory of Nuclear Analysis Techniques Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China 4 Institute of Plasma Physics Chinese Academy of Sciences Hefei Anhui 230031 China

＜正＞The Reduced Activation Ferritic/Martensitic（RAFM） steel is considered as the primary candidate of structural material for both the ITER and the first fusion plant, and widely studied in the *** China Low Activ... 详细信息

关键词： CLAM Steel Ion Implantation slow positron beam

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EFFECTS OF ACTIVE ELEMENTS Y AND Ce ON HIGH TEMPERATURE OXIDATION OF Fe-25Cr-40Ni ALLOY

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Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 383-390页

作者： YU Fanghua YANG Guohua Shanghai Institute of Nuclear Research,Academia Sinica,Shanghai,ChinaHAN Rongdian WENG Huimin University of Science and Technology of China,Hefei,ChinaSHEN Jianian Corrosion Science Laboratory,Institute of Corrosion and Protection of Metals Academia Sinica,Shenvang,China Shanghai Inst of Nuclear Research Acad Sinica Shanghai China

The effects of small amount(≥0.05%)of active elements Y and Ce in Fe-25Cr-40Ni al- loy have been investigated on the kinetics of early stage of high temperature oxidation as well as composition and microsructure of oxide film by ion backscattering and slow positron *** results show that Y and Ce can reduce evidently the high tem- perature oxidation rate of FeCrNi alloy at early stage and can effectively enhance the Cr_2O_3 formation and retard the oxide formation of Fe and Ni in the surface layer thus the microstructure of the oxide film is improved.Y and Ce enter the oxide film and concentrate within several tens nanometres from surface of the outer *** mech- anism of oxidation resistance for Ce is different from *** can decrease the density of vacancy defects in oxide layer,so the cations are restrained from diffusion outward through *** Y can control the outward diffusion of cations through va- cancies at the early statge of oxidation(shorter than 12 min),aften that restrained the cations from diffusion outward along grain boundaries up to 60 min oxidation.

关键词： ion backscattering slow positron beam oxidation active elements FeCrNi alloy

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