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YSO coded aperture camera based on depth of interaction for location correction

Radiation Detection Technology and Methods 2023年第4期7卷 589-598页

作者： Yiding Han Xiaopan Jiang Haohui Tang Xiuzuo Liang Xuanhou Hu Xianchao Huang Zhiming Zhang Lei Shuai Jing Guo Long Wei Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing100049China Jinan Laboratory of Applied Nuclear Science Jinan250131China CAEA Center of Excellence on Nuclear Technology Applications for Nuclear Detection and Imaging TaiyuanChina

Purpose Coded aperture imaging was a widely used imaging method for radiation ***,the traditional gamma camera based on two-dimensional projection information for coded aperture imaging ignored the influence of the interaction depth of particles and detectors on the projection information,which reduced the imaging quality of the camera to some ***,a method of correcting the coded gamma camera based on the interaction depth of particles and detectors is proposed to improve the location accuracy of *** The camera developed in this work uses a 7×7 YSO crystal array coupled with two 7×7 Si-PM *** crystal is evenly divided into 11 parts in the depth direction,with a voxel size of 3×3×3 *** coded mask is a 13×13 array,which is a mosaic of two cycles of 7×7 modified uniformly redundant array *** depth resolution of the detector is obtained via the subsurface laser engraving dual-end readout *** obtaining the three-dimensional position information of the interaction point the projection information obtained by the detector is layered,and the image is *** to the spatial position information of the detector and the coded mask,the corresponding field of view of each layer of the detector is calculated,and the reconstructed image of each layer is amplified and superimposed according to the ratio of the field of view to obtain the reconstructed image combined with the depth *** and conclusion According to Monte Carlo simulation and radiation source imaging experiment results,this method can effectively improve the positioning ability of the *** the experimental scenario mentioned in the paper,the location accuracy can be improved by up to 1.54°.

关键词： Depth of interaction Coded aperture gamma camera YSO detector Location accuracy

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Technical note: Error analysis of material-decomposition-based effective atomic number quantification method

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Medical physics 2024年第1期51卷 419-427页

作者： Chen, Li Ji, Xu Wang, Zhe Chen, Yang Laboratory of Image Science and Technology the School of Computer Science and Engineering Southeast University Nanjing China Jiangsu Provincial Joint International Research Laboratory of Medical Information Processing Southeast University Nanjing China Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy Physics Chinese Academy of Sciences Beijing China Jinan Laboratory of Applied Nuclear Science Jinan China Ministry of Education China

Background: The effective atomic number (Zeff) is widely applied to the identification of unknown materials. One method to determine the Zeff is material-decomposition-based spectral X-ray imaging. The method relies on certain approximations of the X-ray interaction cross-sections such as empirical model coefficients. The impact of such approximations on the accuracy of Zeff quantification has not been fully investigated. Purpose: To perform an error analysis of the material-decomposition-based Zeff quantification method and propose a coefficient calibration-in-groups method to improve the modeling accuracy and reduce the Zeff quantification error. Methods: The model of the material-decomposition-based Zeff quantification method relies on the dependence of the interaction cross-sections (σPE) on the atomic number Z and corresponding coefficient, that is, (Formula presented.). In this work, all the data is from the National Institute of Standards and Technology (NIST) website. First, the coefficient m is calibrated through a logarithmic fitting method to quickly determine the m values for any certain energy and Zeff ranges. Then materials including elements and common compounds with Zeff ranging from 6–20 are selected as the objects whose effective atomic numbers are to be quantified. Different combinations of basis materials are applied to decompose the object materials and their quantification errors are analyzed. With the help of error analysis, the object materials are divided into high-error and low-error groups based on the decomposition coefficient ratio (Formula presented.), which is found to have a strong correlation with error, and their coefficients are calibrated in groups. Finally, the average errors of three m selection strategies: (1) using an empirical m value of 3.94, which is also considered a standard method;(2) using a single m value, which is calibrated through the logarithmic fitting method;(3) using different m values calibrated in groups, are

关键词： Atoms

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J-TEXT achievements in turbulence and transport in support of future device/reactor

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Plasma science and Technology 2024年第11期26卷 1-21页

作者： Zhipeng CHEN Zhangsheng HUANG Min JIANG Ting LONG Lu WANG Weixin GUO Zhoujun YANG Hai LIU Tao LAN Kaijun ZHAO Yuhong XU Rui KE Youwen SUN Hanhui LI Wen HE Ge ZHUANG Yuejiang SHI Wulyu ZHONG Yonghua DING Yunfeng LIANG Wenjing TIAN Xin XU Guodong ZHANG M.S.HUSSAIN Patrick H.DIAMOND State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People’s Republic of China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China College of Electrical Engineering&New Energy China Three Gorges UniversityYichang 443002People’s Republic of China Department of Engineering and Applied Physics School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026People’s Republic of China ENN Science and Technology Development Co.Ltd. and Hebei Key Laboratory of Compact FusionLangfang 065001People’s Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany Tsinghua University Beijing 100084People’s Republic of China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China Center for Astrophysics and Space Sciences University of California San DiegoLa Jolla CA 92093United States of America

Following the reconstruction of the TEXT tokamak at Huazhong University of science and Technology in China, renamed as J-TEXT, a plethora of experimental and theoretical investigations has been conducted to elucidate the intricacies of turbulent transport within the tokamak configuration. These endeavors encompass not only the J-TEXT device's experimental advancements but also delve into critical issues pertinent to the optimization of future fusion devices and reactors. The research includes topics on the suppression of turbulence, flow drive and damping, density limit, non-local transport, intrinsic toroidal flow, turbulence and flow with magnetic islands, turbulent transport in the stochastic layer, and turbulence and zonal flow with energetic particles or helium ash. Several important achievements have been made in the last few years, which will be further elaborated upon in this comprehensive review.

关键词： J-TEXT tokamak turbulence transport flow

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Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses

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Matter and Radiation at Extremes 2024年第4期9卷 54-67页

作者： Q.K.Liu L.Deng Q.Wang X.Zhang F.Q.Meng Y.P.Wang Y.Q.Gao H.B.Cai S.P.Zhu Graduate School China Academy of Engineering PhysicsBeijing 100088China Institute of Applied Physics and Computational Mathematics Beijing 100094China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Shanghai Institute of Laser Plasma Shanghai 201800China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China School of Physics Zhejiang UniversityHangzhou 310027China

We examine electron kinetic effects in broadband-laser-driven back-stimulated Raman scattering(BSRS)bursts using particle-in-cell *** bursts occur during the nonlinear stage,causing reflectivity spikes and generating large numbers of hot ***-duration simulations are performed to observe burst events,and a simplified model is developed to eliminate the interference of the broadband laser’s random intensity *** the simplified model,we isolate and characterize the spectrum of electron plasma *** spectrum changes from a sideband structure to a turbulence-like structure during the burst.A significant asymmetry in the spectrum is *** asymmetry is amplified and transferred to electron phase space by high-intensity broadband laser pulses,leading to violent vortex-merging and generation of hot *** proportion of hot electrons increases from 6.76%to 14.7%during a single violent burst *** demonstrate that kinetic effects profoundly influence the BSRS evolution driven by broadband lasers.

关键词： scattering kinetic simplified

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Trapping of triply charged thorium-229 for a nuclear clock 9

Trapping of triply charged thorium-229 for a nuclear clock

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9th Symposium on Frequency Standards and Metrology, FSM 2023

作者： Yamaguchi, A. Shigekawa, Y. Haba, H. Wada, M. Katori, H. Quantum Metrology Laboratory RIKEN Saitama Japan Space-Time Engineering Research Team RIKEN Saitama Japan Department of Applied Physics Graduate School of Engineering The University of Tokyo Tokyo Japan Nishina Center for Accelerator-Based Science RIKEN Saitama Japan KEK Wako Nuclear Science Center Saitama Japan

We developed an ion trap system for triply charged thorium-229 (229Th3+). We used uranium-233 as the ion source, which supplied 229Th3+ ions in the nuclear ground state and low-lying isomeric state (229mTh3+) at 8.3 eV. Our ion trap system allows the laser spectroscopy of 229mTh3+ toward the nuclear clock. © Published under licence by IOP Publishing Ltd.

关键词： Atomic clocks

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Stabilization of high-voltage layered oxide cathode by utilizing residual lithium to form NASICON-type nanoscale functional coating

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Nano Research 2023年第4期16卷 5973-5982页

作者： Yabin Shen Yingqiang Wu Dongyu Zhang Yao Liang Dongming Yin Limin Wang Licheng Wang Jingchao Cao Yong Cheng State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of China(USTC)Hefei 230026China College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China Changsha Research Institute of Mining and Metallurgy Co. LtdChangsha 410012China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

High-voltage medium-nickel low-cobalt lithium layered oxide cathode materials are becoming a popular development route for high-energy lithium-ion batteries due to their relatively high capacity,low cost,and improved ***,capacity fading derived from surface lithium residue,electrode-electrolyte interfacial side reactions,and bulk structure degradation severely limits large-scale commercial *** this work,an ultrathin and uniform NASICON-type Li_(3)V_(2)(PO_(4))_(3)(LVP)nanoscale functional coating is formed in situ by utilizing residual lithium to enhance the lithium storage performance of LiNi_(0.6)Co0.05Mn_(0.35)O_(2)(NCM)*** GITT and ex-situ EIS and XPS demonstrate exceptional Li+diffusion and conductivity and attenuated interfacial side reactions,improving the electrode-electrolyte interface *** variable temperature in-situ XRD demonstrates delayed phase transition temperature to improve thermal *** battery in-situ XRD displays the singlephase H1-H2 reaction and weakened harmful H3 phase transition,minimizing the bulk mechanical *** improvements are attributed to the removal of surface residual lithium and the formation of NASICON-type Li_(3)V_(2)(PO_(4))_(3)functional coatings with stable structure and high ionic and electronic ***,the obtained NCM@LVP delivers a higher capacity retention rate(97.1%vs.79.6%)after 150 cycles and a superior rate capacity(87 mAh·g^(-1)vs.58 mAh·g^(-1))at a 5 C current density than the pristine NCM under a high cut-off voltage of 4.5 *** work suggests a clever way to utilize residual lithium to form functional coatings in situ to improve the lithium storage performance of high-voltage medium-nickel low-cobalt cathode materials.

关键词： lithium-ion battery high-voltage medium-nickel low-cobalt cathode surface modification residual lithium NASICON-type Li3V2(PO4)3

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Noise reduction of electron holography observations for a thin-foiled Nd-Fe-B specimen using the wavelet hidden Markov model

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applied Microscopy 2024年第1期54卷 4页

作者： Lee, Sujin Midoh, Yoshihiro Tomita, Yuto Tamaoka, Takehiro Auchi, Mitsunari Sasaki, Taisuke Murakami, Yasukazu Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Fukuoka819-0395 Japan Present address: Korea Institute of Materials Science Changwon51508 Korea Republic of Graduate School of Information Science and Technology Osaka University Osaka565-0871 Japan The Ultramicroscopy Research center Kyushu University Fukuoka819-0395 Japan National Institute for Materials Science Tsukuba305-0047 Japan

In this study, we investigate the effectiveness of noise reduction in electron holography, based on the wavelet hidden Markov model (WHMM), which allows the reasonable separation of weak signals from noise. Electron holography observations from a Nd2Fe14B thin foil showed that the noise reduction method suppressed artificial phase discontinuities generated by phase retrieval. From the peak signal-to-noise ratio, it was seen that the impact of denoising was significant for observations with a narrow spacing of interference fringes, which is a key parameter for the spatial resolution of electron holography. These results provide essential information for improving the precision of electron holography studies. © The Author(s) 2024.

关键词： Signal to noise ratio

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Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading

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Matter and Radiation at Extremes 2025年第1期10卷 81-97页

作者： Xianye Wu Xiaoyang Pei Xiang Chen Hao Zhang Jin Wang Xin Yang Meizhen Xiang Shang Gao Fang Wang School of Materials and Energy Southwest UniversityChongqing 400715China Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621999China State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China

This study uses nonequilibrium molecular dynamics simulations to explore the dynamic failures and deformation mechanisms of a cylindrical shell composed of nanocrystalline nickel-titanium alloy under implosion *** discover that some individual spall planes are sequentially generated in the material along the propagation of a radial stress wave,indicative of the formation of multiple *** larger grain sizes,void nucleation at the first spallation occurs in a coexisting intergranular/transgranular manner,whereas with decreasing grain size,voids tend to nucleate along the grain ***,the spall strength exhibits a transition from an inverse Hall-Petch to a Hall-Petch *** larger grain sizes,at the secondary spallation,localized shearing zones and grain boundaries provide potential void-nucleated ***,the formation of shear deformation bands promotes grain refinement,contributing to a reduction in the dislocation-induced strengthening ***,a lower spall strength is produced,in contrast to the first *** the grain size becomes smaller,voids nucleate mostly along grain boundaries,and plastic deformation is dominated by dense grain ***,the high temperature caused by shear localization leads to material weakening,and in turn there is a significant decrease in the spall strength for the secondary spallation,compared with the ***,significant penetration between two spall planes is observed for large grain size,which can be attributed to the nucleation of voids on linking grain boundaries,with temperatures exceeding the melting point of the material.

关键词： grain alloy deformation

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A simple analytical model of laser direct-drive thin shell target implosion

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Chinese physics B 2022年第4期31卷 481-485页

作者： Bo Yu Tianxuan Huang Li Yao Chuankui Sun Wanli Shang Peng Wang Xiaoshi Peng Qi Tang Zifeng Song Wei Jiang Zhongjing Chen Yudong Pu Ji Yan Yunsong Dong Jiamin Yang Yongkun Ding Jian Zheng School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900China Institute of Applied Physics and Computational Mathematics Beijing 100088China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

A high-neutron yield platform imploded by a thin shell target is generally built to probe nuclear science problems,and it has the advantages of high neutron yield,ultrashort fusion time,micro fusion zone,isotropic and monoenergetic *** analytical models have been proposed to interpret exploding-pusher target implosion driven by a long wavelength laser,whereas they are imperfect for a 0.35 μm laser implosion *** using the 0.35 μm laser,the shell is ablated and accelerated to high implosion velocity governed by Newton’s law,ablation acceleration and quasi-adiabatic compression models are suitable to explain the implosion of a laser direct-drive thin shell *** new analytical model scales bang time,ion temperature and neutron yield for large variations in laser power,target radius,shell thickness,and fuel *** predicted results of the analytical model are in agreement with experimental data on the ShenguangIII prototype laser facility,100 kJ laser facility,Omega,and NIF,it demonstrates that the analytical model benefits the understanding of experiment performance and optimizing the target design of high neutron yield implosion.

关键词： direct drive analytical model thin shell target neutron yield

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Spontaneous magnetic field and disorder effects in BaPtAs1−xSbx with a honeycomb network

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Physical Review B 2025年第10期111卷 L100508-L100508页

作者： Tadashi Adachi Taiki Ogawa Yota Komiyama Takuya Sumura Yuki Saito-Tsuboi Takaaki Takeuchi Kohei Mano Kaoru Manabe Koki Kawabata Department of Engineering and Applied Sciences Sophia University 7-1 Kioi-cho Chiyoda-ku Tokyo 102-8554 Japan Department of Physics Graduate School of Science Osaka University 1-1 Machikaneyama Toyonaka 560-0043 Japan Research Institute for Interdisciplinary Science Okayama University 3-1-1 Tsushimanaka Kita-ku Okayama 700-8530 Japan Nuclear Structure Research Group Nishina Center for Accelerator-Based Science RIKEN 2-1 Hirosawa Wako 351-0198 Japan

Chiral superconductivity exhibits the formation of novel electron pairs that breaks the time-reversal symmetry and has been actively studied in various quantum materials in recent years. However, despite its potential to provide definitive information, effects of disorder in the crystal structure on the chiral superconductivity has not yet been clarified, and therefore the investigation using a solid-solution system is desirable. We report muon-spin-relaxation (µSR) results of layered pnictide BaPtAs1−xSbx with a honeycomb network composed of Pt and (As, Sb). We observed an increase of the zero-field muon-spin relaxation rate in the superconducting (SC) state at the Sb end of x=1.0, suggesting the occurrence of a spontaneous magnetic field due to the time-reversal symmetry breaking in the SC state. On the other hand, a spontaneous magnetic field was almost and completely suppressed for the As-Sb mixed samples of x=0.9 and 0.2, respectively, suggesting that the time-reversal symmetry-breaking SC state in x=1.0 is sensitive to disorder. The magnetic penetration depth estimated from transverse-field µSR measurements at x=1.0 and 0.2 behaved like weak-coupling s-wave superconductivity. These seemingly incompatible zero-field and transverse-field µSR results of BaPtAs1−xSbx with x=1.0 could be understood in terms of chiral d-wave superconductivity with point nodes on the three-dimensional Fermi surface.

关键词： Shear waves

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