最新刊期
      卷 0 ， 期 0 ， 2020
      • LI Ming1,2 SHI Hong1 DONG Shuqiang2,3 LIU Peng1 1
        Vol. 32, Issue 6, (2009)
        摘要：In this paper,we describe a double-wire photon beam position monitor(PBPM) for monitoring synchrotron radiation(SR) intensity by photosensitive wire based on the principle of photoemission.In scan mode,the SR intensity distribution can be easily obtained.In the static state,we can realize real-time monitoring of the SR beam position by changes of the photoelectron currents of the two wire sensors.The principle,design,parametric optimization,error analysis,and its application in Beijing Synchrotron Radiation Facility(BSRF) are given.  
        关键词：Beam position monitor;Monitor function;Synchrotron radiation   
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        发布时间：2021-03-12
      • LU Lei1 KANG Le2 LI Zhongliang2 ZHAO Feiyun2 MAO Peihong1 XU Chaoyin2 1
        Vol. 32, Issue 6, (2009)
        摘要：In this paper,we describe the principles and structure of the beam position monitor(BPM),which is composed with two thin tungsten wires perpendicular to each other.A linear motion forming 45 ° with respect to horizontal scans simultaneously two wires across the beam spot to measure both photoemission currents as function of the position.The BPM has been mounted on the XAFS beamline at NSRL to monitor the synchrotron radiation stability from the Wiggler,including the photocurrents distribution in vertical and horizontal directions and drifts of the beam spot as attenuation of the electronic beam in different injections.It is useful in improving operation of the storage ring and collimating optical elements of the beamline.  
        关键词：Monitor;Scanning;Photocurrent;Center of the spot;Beam stability   
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        发布时间：2021-03-12
      • HE Shengnan LIU Ying ZHOU Hongjun HUO Tonglin FU Shaojun
        Vol. 32, Issue 6, (2009)
        摘要：Higher-harmonics suppressor was designed for Beamline U26 at NSRL in order to improve the spectral purity of the monochromatic light over the wavelength region of 45–115nm.An investigation revealed that at certain incidence angle,the reflectivity of Al or Si,varying with the wavelength,has obvious cut-off wavelength that increases with decreasing incidence angle.And silicon was chosen as the mirror material for designing a two-mirror higher-harmonic suppressor.The system consists of four pairs of parallel mirrors,each of which works at a different wavelength range.Optimal incidence angle of each pair of reflector was determined.The calculated results show that suppression ratio of the system is greater than 100 over the 45–115 nm range.  
        关键词：Beamline;VUV;Higher-harmonics suppressor   
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        发布时间：2021-03-12
      • TIAN Shibing1 LIU Yuzhen1 ZHANG Maolin2 WANG Lihua2 XIE Yaning3 WANG Cangsui2 1
        Vol. 32, Issue 6, (2009)
        摘要：The origin of a red color glazes decorated on the ancient Jun porcelain has been attributed to the presence of combined copper clusters and cuprous oxide,or cuprous oxide alone.For better understanding of the color-forming mechanism,X-ray absorption at the Cu-edge by the red area of a Jun porcelain shard was carried out.By comparing the XANFS spectra of the sample with metal copper and cubic Cu2O,we found that the spectra of the red layer of sample were similar to the spectrum combination of 37% Cu2O and 63% metal copper,while the spectra from surface of the red spot mainly resembled that of cubic Cu2O.The EXAFS results showed that monovalence copper cations were isolated in the glaze matrix,and copper atoms were formed to metallic copper clusters or mutimers dominantly distributed in the inner layer.These can be responsible to the optical properties of the red decoration with the presence of colloidal composition containing copper particles and the Cu+ ions.In conclusion,a preliminary non-destructive elemental analysis using synchrotron radiation-induce X-ray fluorescence(SR-XRF) is demonstrated,and mechanism about the formation of the complicated structures is discussed.  
        关键词：Jun porcelain;Copper red glaze;SR-XAFS;SR-XRFS;Coloring mechanism   
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        发布时间：2021-03-12
      • ZHANG Yuanxun1 LI Xiaolin1 BAO Liangman1 ATSUO Iida2 ZHAO Yidong3 ZHANG Guilin1 LI Yan1 1
        Vol. 32, Issue 6, (2009)
        摘要：Elemental contents in particulate matters of 13 sizes from 30 nm to 10000 nm were determined by using synchrotron radiation X-ray fluorescence(SRXRF).X-ray absorption near-edge structure(XANES) spectra of S chemical speciation in the particulate matter samples were also measured.It was found that ultra-fine particles(< 400 nm) had contributed more to the total mass concentration of the particulate matter in the resident area and suburb,while fine particles(1–10 μm) had contributed more in the industrial district.The results showed that the elemental concentration of particulate matter was highest in the Wusong industrial zone,and some polluted elements,such as Ni,Mn,As and Pb,had been obviously enriched in the fine particles and in the ultra-fine particles.The results of chemical speciation determination demonstrated that S existed mainly as sulfate in particles of different sizes,but some original states of S existed as low valences in the ultra-fine particles of < 100 nm in Wusong industrial zone.  
        关键词：Synchrotron radiation;Air particulate matter;XRF;XANES;Elemental concentration;Chemical speciation   
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        发布时间：2021-03-12
      • LI Zhongwen TANG Guangze MA Xinxin SUN Mingren
        Vol. 32, Issue 6, (2009)
        摘要：Tantalum films of 100-nm thickness were deposited on GCr15 bearing steel by magnetron sputtering.The films were implanted to different doses of 50 keV carbon ions by plasma-based ion implantation.Wear resistance test were performed on ball-disk friction tester with Φ6 mm GCr15 steel balls.X-ray diffraction patterns showed that the modified layers contained Ta2C,and TaC appeared at increased doses.Wear property of the modified GCr15 steel was improved,according to scanning electron microscopy images of the wear trace and abrasive debris.Under 1N load and 50 mm/s sliding speed,in comparison with the control,anti wear property of the sample deposited with Ta film and implanted with 3×1017 /cm2 carbon ions increased by a factor of 1.65,and the friction coefficient decreased from 0.8~1 to 0.5 after Ta film deposition,and decreased further to 0.2~0.3 after the carbon ion implantation.It was found that the main wear mechanism is abrasive wear.  
        关键词：Magnetron sputtering deposition;Carbon ion implantation;Friction coefficient;Abrasive wear   
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        发布时间：2021-03-12
      • SANG Lijun CHEN Qiang
        Vol. 32, Issue 6, (2009)
        摘要：Diamond-like carbon films(DLC) were deposited on single crystalline silicon surface under different pulsed negative biases in an ECR(electron cyclotron resonance) plasma source.Chemical structure and morphology were characterized by Fourier transformation infrared spectroscopy(FT-IR) and atomic force microscopy(AFM).Friction coefficient of the films was tested.The results show that the films,with smooth and dense morphology,were typical hydrogenated DLC with –CHn stretching in 2800-3000 cm-1.By increasing the pulsed negative bias,the FT-IR peak intensity of C-H stretching vibration increased with the pulsed negative bias,reaching a maximum at 200 V,and then decreased.And friction coefficient of the films decreased with the pulsed negative bias,reaching a minimum at 200 V,and then increased.  
        关键词：Diamond-like carbon films;ECR;Pulsed negative bias;Structure and performance   
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        发布时间：2021-03-12
      • LU Yang1 WANG Langping1 WANG Xiaofeng2 YU Yonghao1 HUANG Lei1 XIE Zhiwen1 1
        Vol. 32, Issue 6, (2009)
        摘要：High voltage pulsed glow discharge was introduced into the research of inner surface modification to improve the uniformity of implantation dose and depth.The plasma parameter was studied by probe and OES.Ion implantation was performed in a special tube under nitrogen atmosphere.The results showed that continuous plasma could be obtained on the inner surface,and atom in excitation was the majority state in the argon plasma while the N2+ was the majority in the nitrogen plasma.The plasma density increased with the voltage.At 10?15 kV,the argon plasma density increased by about 4 times and the nitrogen plasma density increased by 2 times.Uniform modification layer was obtained on the inner surface of a cylinder of Φ56 mm.The depth reached 16.9 nm and the dose homogeneity was 87.34% at 15 kV and 1.5 Pa.  
        关键词：Inner surface;High voltage pulsed glow discharge;OES;Electrostatic probe   
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        发布时间：2021-03-12
      • CAI Zhihai1 ZHANG Ping1 ZHAO Junjun1 DU Jun1 NIU Qingyin2 1
        Vol. 32, Issue 6, (2009)
        摘要：By using multi-ion plating,CrN films were made on surface of piston rings to improve its tribological properties and service life.Effects of nitrogen content to prepare the film on hardness and phase structure were studied.The high-temperature tribological properties of Cr plating and CrN films were compared with CETR friction tester.The results show that nitrogen partial pressure significantly affects the mechanical properties of CrN films.With increasing N2 partial pressure,preferential growth orientation of the film changed from Cr2N(211) to CrN(220) phase,leading to two hardness peaks corresponding to the Cr2N and CrN phases,respectively.Having higher high-temperature wear resistance and lower friction coefficient than Cr plating,the CrN films are suitable for piston rings under high temperature conditions.  
        关键词：Piston rings;Multi-ion plating;CrN coatings;Tribological properties   
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        发布时间：2021-03-12
      • YAN Rui GUO Zhi TAI Renzhong
        Vol. 32, Issue 6, (2009)
        摘要：A new depolarized photon correlation spectroscopy system was built.Long range correlation dynamics of polarization clusters in BaTiO3 have been observed directly near the Curie temperature(TC) by photon correlation spectroscopy.The clusters on the order of 200 nm were found to be dynamic near TC with a characteristic relaxation time of several microseconds.And this relaxation time decreased with an increase in temperature,but exhibited an anomaly at TC.  
          
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        发布时间：2021-03-12
      • LIU Jiangfeng1,2 BAO Liangman1 LI Xiaolin1 1
        Vol. 32, Issue 6, (2009)
        摘要：Proton beam writing(PBW) is a direct writing technique allowing the creation of three-dimensional structures with a high aspect ratio in the micrometer and nanometer range in photoresist materials without the use of a templates.On the scanning proton microprobe(SPM) at Shanghai Institute of Applied Physics,this technique was established recently.In this paper,progresses in this area of research are presented.PBW was successfully performed with the positive resist polymethyl methacrylate(PMMA).With the new scanning system being commissioned,a new scan program was developed and tested which is dedicated to the creation of arbitrarily shaped structures.  
        关键词：Microstructures;Proton beam writing;Maskless;Photoresist   
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        发布时间：2021-03-12
      • ZHANG Jing1,2 WANG Min2 PU Changyong1,2 MA Hongjuan1,2 CAO Changqing2 YAO Side2 1
        Vol. 32, Issue 6, (2009)
        摘要：Glycidyl methacrylate(GMA) is grafted on to Polyvinylidene fluoride(PVDF) powder by pre-irradiation method.Results show that the degree of grafting(Dg) increases with absorbing dose.With the increment of reaction time,Dg increases and almost keeps unchanged after 5 h.Dg increases at first until the monomer concentration reached 15%,and then decreases.When the temperature is higher than 30°C,Dg increases quickly and reaches the maximum at 50°C.A kind of amine-type absorbents has been prepared by further chemical modification of PVDF-g-PGMA.The grafted powder is a PVDF-g-PGMA copolymer,as confirmed by FTIR characterization.DSC analysis shows that the melting point and melting enthalpy decreases with the increment of Dg.  
        关键词：PVDF;Pre-irradiation-induced graft;GMA;Triethylenetetramine;Absorbents   
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        发布时间：2021-03-12
      • HUANG Chaoqiang LI Xinxi SONG Jianming CHEN Bo
        Vol. 32, Issue 6, (2009)
        摘要：In this work,Monte Carlo simulations were done for optimization of pre-guide of neutron reflectometer(NR) in two proposals: A,pre-guide of 8.0 m in length,vertical focusing guide of 200-mm entrance and 40-mm exit height;B,pre-guide of(1.6 + 3.4) m long,vertical focusing and horizontal deflecting guide of 100-mm entrance and 50-mm exit height.The following results were found: 1) it is not necessary to deflect neutron beam for NR at the exit of cold neutron guide,2) compared proposal A with B,the flux at pre-guide exit decreases 52.8% and divergence increases 24.1% in horizontal direction and decreases 60.7% in vertical plane,and 3) a optimized pre-guide should not be shorter than 6.0 m,focusing super-mirror factor m in the range between 2.0 and 2.5,and its entrance height no less than 150 mm.  
        关键词：Guide optimization;Neutron focusing;Neutron beam characteristic;Monte Carlo simulation;Cold neutron guide   
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        发布时间：2021-03-12
      • ZHU Tonghua LIU Rong JIANG Li WEN Zhongwei LU Xinxin WANG Mei LIN Jufang WANG Dalun
        Vol. 32, Issue 6, (2009)
        摘要：Under the same neutron radiation conditions,fission counts are proportional to the number of fission nuclei.Based on this concept,a relative quantifying method has been developed to measure the mass of fission plate in fission chamber on a 14 MeV accelerator neutron source at the Neutron Physics Laboratory,INPC,CAEP.The experimental assembly was introduced and mass of the fission material in several fission chambers was measured.The results by this method agree well(within 1%) with the α-quantifying method Therefore,it is absolutely feasible to quantify the fission plate mass in fission chambers.The measurement uncertainty is 2%~4%.  
        关键词：14 MeV neutron source;Fission plate;Relative quantifying method   
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        发布时间：2021-03-12
      • ZHOU Qingzhi ZHAO Guizhi XIAO Detao
        Vol. 32, Issue 6, (2009)
        摘要：A method for superposing spectroscopy was developed and it can inquire simultaneously any energy span α spectroscopy of radon progeny and thoron progeny for any period.When measurement period was overlapped in an optimized α spectrum method for measuring radon progeny concentration and thoron progeny concentration in air the spectrum superposition method resolves this problem.So it can measure quickly and reliably radon progeny concentration and thoron progeny concentration in air on the ORTEC α spectroscopy workstation.  
        关键词：Radon progeny;Thoron progeny;α spectroscopy;Spectrum superposition;Measurement   
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        发布时间：2021-03-12
      • ZHAO Meijia SHEN Bo YUAN Dexiao CHENG Honghong SHAO Chunlin
        Vol. 32, Issue 6, (2009)
        摘要：The role of p53 in bystander responses on normal liver cells were investigated by co-culturing irradiated hepatoma cells with non-irradiated bystander Chang liver cells.It was found that radiosensitivity of the hepatoma cells was relative to p53.HepG2 cells with wtp53 had the highest radiosensitivity followed by PLC/PRF/5 cells with mtp53 and Hep3B cells with null-p53.The induction of bystander micronucleus(MN) was observed only in the Chang liver cells that had been co-cultured with HepG2 cells but not co-cultured with PLC/PRF/5 or Hep3B.Also,this bystander MN was relative to the irradiation dose and the cell co-culture rime.When the hepatoma cells were treated with pifithrin-α,a p53 inhibitor,their radiosensitivities were reduced,and the bystander effect was diminished.The results indicate that p53 could regulate not only the radiosensitivity but also the bystander response.  
        关键词：Hepatoma cells;Radiosensitivity;Bystander effect;p53   
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        发布时间：2021-03-12
      • MA Yanliang OUYANG Xiaoping WANG Qunshu ZHANG Zhongbing
        Vol. 32, Issue 6, (2009)
        摘要：This paper presents the neutron sensitivity calculation of a slot-collimated PIN fission chamber.By using the formula of average energy deposition and the correction coefficients provided in the references,a practical calculation model was developed.The results from numerical calculations in Visual Fortran were compared with experimental results,and this proved that authentic results were attained.  
        关键词：Fission fragment;Energy deposition;Neutron sensitivity;Cross section;Integral;Insertion   
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        发布时间：2021-03-12
      • XIE Mingpu WU Jie ZHANG Jie
        Vol. 32, Issue 6, (2009)
        摘要：A clock and data recovery method based on charge pump PLL was developed to archive medium data rate serial digital communication with simple line transceivers.The phase detector was realized by FPGA.A delay chain was constructed by delay elements with the same fixed delay.Every output of the delay elements was latched by the VCO output clock when the input signal went through the delay chain.The latched result was used to detect the data transition,which reflected the phase difference between the input signal and the VCO output clock.The VCO control voltage was adjust by charge pump to reduce the phase difference and archive phase lock.The loop filter was a passive filter,parameters of which were calculated from parameters of the delay chain and VCO.The experimental result shows that the clock of a 64Mbps transmission was recovered with a jitter less than 200 ps.  
        关键词：CDR;FPGA;Delay chain;Phase detector;Loop filter design   
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        发布时间：2021-03-12
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