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High energy window for probing dark matter with cosmic-ray antideuterium and antihelium

Chinese physics C 2021年第6期45卷 188-201页

作者： Yu-Chen Ding Nan Li Chun-Cheng Wei Yu-Feng Zhou CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASand International Centre for Theoretical Physics Asia-PacificBeijing/HangzhouChina Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Cosmic-ray(CR)anti-nuclei are often considered important observables for indirect dark matter(DM)detection at low kinetic energies,below GeV per *** the primary CR fluxes drop quickly towards high energies,the secondary anti-nuclei in CR are expected to be significantly suppressed in high energy regions(≥10 GeV per nucleon).If DM particles are heavy,the annihilation productions of DM can be highly boosted,and thus the fluxes of anti-nuclei produced by DM annihilation may exceed the secondary background at high energies,which opens a high energy window for indirect DM *** investigate the possibility of detecting heavy DM particles which annihilate into high energy *** use the Monte Carlo generators PYTHIA,EPOS-LHC and DPMJET and the coalescence model to simulate the production of anti-nuclei,and constrain the DM annihilation cross-sections by using the AMS-02 and HAWC antiproton data and the HESS galactic center-ray *** find that the conclusion depends on the choice of DM density *** the“Cored”type profile with a DM particle mass≥10 TeV,the contributions from DM annihilation can exceed the secondary background in high energy regions,which opens the high energy window,while for the“Cuspy”type profile,the excess disappears.

关键词： dark matter coalescence model antideuterium antihelium

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The In-Flight Realtime Trigger and Localization Software of GECAM

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Research in Astronomy and Astrophysics 2024年第10期24卷 11-24页

作者： Xiao-Yun Zhao Shao-Lin Xiong Xiang-Yang Wen Xin-Qiao Li Ce Cai Shuo Xiao Qi Luo Wen-Xi Peng Dong-Ya Guo Zheng-Hua An Ke Gong Jin-Yuan Liao Yan-Qiu Zhang Yue Huang Lu Li Xing Wen Fei Zhang Jing Duan Chen-Wei Wang Dong-Li Shi Peng Zhang Qi-Bin Yi Chao-Yang Li Yan-Bing Xu Xiao-Hua Liang Ya-Qing Liu Da-Li Zhang Xi-Lei Sun Fan Zhang Gang Chen Huan-Yu Wang Sheng Yang Xiao-Jing Liu Min Gao Mao-Shun Li Jin-Zhou Wang Xing Zhou Yi Zhao Wang-Chen Xue Chao Zheng Jia-Cong Liu Xing-Bo Han Jin-Ling Qi Jia Huang Ke-Ke Zhang Can Chen Xiong-Tao Yang Dong-Jie Hou Yu-Sa Wang Rui Qiao Xiang Ma Xiao-Bo Li Ping Wang Xin-Ying Song Li-Ming Song Shi-Jie Zheng Bing Li Hong-Mei Zhang Yue Zhu Wei Chen Jian-Jian He Zhen Zhang Jin Hou Hong-Jun Wang Yan-Chao Hao Xiang-Yu Wang Zong-Yuan Yang Zhi-Long Wen Zhi Chang Yuan-Yuan Du Rui Gao Xiao-Fei Lan Yan-Guo Li Gang Li Xu-Fang Li Fang-Jun Lu Hong Lu Bin Meng Feng Shi Hui Wang Hui-Zhen Wang Yu-Peng Xu Jia-Wei Yang Xue-Juan Yang Shuang-Nan Zhang Chao-Yue Zhang Cheng-Mo Zhang Zhi-Cheng Tang Cheng Cheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China School of Information Science and Technology Southwest Jiaotong UniversityChengdu 611756China Key Laboratory of Stellar and Interstellar Physics and Department of Physics Xiangtan UniversityXiangtan 411105China Physics and Space Science College China West Normal UniversityNanchong 637002China Department of Astronomy Beijing Normal UniversityBeijing 100875China Innovation Academy for Microsatellites of CAS Shanghai 201203China Changchun University of Science and Technology Changchun 130022China Chinese Academy of Sciences South America Center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China

Realtime trigger and localization of bursts are the key functions of GECAM,an all-sky gamma-ray monitor launched on 2020 December *** developed a multifunctional trigger and localization software operating in the CPU of the GECAM Electronic *** onboard software has the following features:high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation,dedicated localization algorithm optimized for both short and long bursts,and low time latency of the trigger information which is downlinked through the Global Short Message Communication service of the global BeiDou navigation *** paper provides a detailed description of the design and development of the trigger and localization software system for *** covers the general design,workflow,the main functions,and the algorithms used in the *** paper also includes on-ground trigger tests using simulated gamma-ray bursts generated by a dedicated X-ray tube,as well as an overview of the performance for real celestial bursts during its in-orbit operation.

关键词： telescopes instrumentation:detectors methods:observational

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Application of deep learning methods combined with physical background in wide field of view imaging atmospheric Cherenkov telescopes

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Nuclear Science and Techniques 2024年第4期35卷 208-220页

作者： Ao-Yan Cheng Hao Cai Shi Chen Tian-Lu Chen Xiang Dong You-Liang Feng Qi Gao Quan-Bu Gou Yi-Qing Guo Hong-Bo Hu Ming-Ming Kang Hai-Jin Li Chen Liu Mao-Yuan Liu Wei Liu Fang-Sheng Min Chu-Cheng Pan Bing-Qiang Qiao Xiang-Li Qian Hui-Ying Sun Yu-Chang Sun Ao-Bo Wang Xu Wang Zhen Wang Guang-Guang Xin Yu-Hua Yao Qiang Yuan Yi Zhang School of Physics and Technology Wuhan UniversityWuhan 430072China School of Physics and Astronomy Yunnan UniversityKunming 650091China Ministry of Education The Key Laboratory of Cosmic Rays(Tibet University)Lhasa 850000China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences 19 A Yuquan RoadShijingshan DistrictBeijing 100049China College of Physics Sichuan UniversityChengdu 610064China School of Intelligent Engineering Shandong Management UniversityJinan 250357China Tsung‑Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Suzhou Aerospace Information Research Institute Suzhou 215123China College of Physics Chongqing UniversityNo.55 Daxuecheng South RoadHigh‑tech DistrictChongqing 401331China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210008China

The High Altitude Detection of Astronomical Radiation(HADAR)experiment,which was constructed in Tibet,China,combines the wide-angle advantages of traditional EAS array detectors with the high-sensitivity advantages of focused Cherenkov *** objective is to observe transient sources such as gamma-ray bursts and the counterparts of gravitational *** study aims to utilize the latest AI technology to enhance the sensitivity of HADAR *** datasets and models with distinctive creativity were constructed by incorporating the relevant physical theories for various *** models can determine the type,energy,and direction of the incident particles after careful *** obtained a background identification accuracy of 98.6%,a relative energy reconstruction error of 10.0%,and an angular resolution of 0.22°in a test dataset at 10 *** findings demonstrate the significant potential for enhancing the precision and dependability of detector data analysis in astrophysical *** using deep learning techniques,the HADAR experiment’s observational sensitivity to the Crab Nebula has surpassed that of MAGIC and *** energies below 0.5 TeV and remains competitive with conventional narrow-field Cherenkov telescopes at higher *** addition,our experiment offers a new approach for dealing with strongly connected,scattered data.

关键词： VHE gamma-ray astronomy HADAR Deep learning Convolutional neural networks

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Control system for cryogenic permanent magnet undulator(CPMU)of high energy photon source(HEPS)

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Radiation Detection technology and Methods 2021年第1期5卷 117-121页

作者： Shutao Zhao Jianshe Cao Huihua Lu Xiaoyu Li Shuchen Sun Yajun Sun Xiangzhen Zhang Lei Zhang Yuhui Li Zhiqiang Li Wan Chen Lingling Gong Qing Guo keyun Gong Yongsheng Huang Yanwei Yang Yufeng Yang Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Science Beijing 100049China

Background High energy photon source(HEPS)is the fourth-generation light source,which uses a large number of highperformance insertion devices to generate synchrotron *** control system is an important part of the insertion device(ID).Purpose Cryogenic permanent magnet undulator(CPMU)is one kind of IDs that works in liquid nitrogen temperature and ultra-high vacuum environment,and its control system is more difficult and complex than in-air *** design of the control system for CPMU will be introduced in *** The sub-systems include high-precision magnetic gap control,safety protection,measurement and compensation of magnetic gap at cryogenic temperature and cryogenic temperature ***,reliable,stable technical schemes are designed to meet the technical specifications of *** The experiment results show that the magnetic gap motion accuracy can be controlled within 0.2–0.3μm under the step size of 1μ*** safety protection system has been tested in turn,and the predetermined protection can be *** average value of magnetic gap cold contraction is 1.512 mm measured by optical micrometer,and the compensation is realized by *** average temperature of the main magnet structure measured by the temperature sensors is 81.0 K,and the temperature gradient is 0.7 K/*** temperature monitoring is reliable and *** The CPMU control system which is based on EPICS has been successfully applied to the CPMU prototype,and the test results have met the design specifications.

关键词： HEPS Cryogenic permanent magnet undulator(CPMU) Control system High-precision magnetic gap control EPICS

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Experimental quantum simulation of a topologically protected Hadamard gate via braiding Fibonacci anyons

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The Innovation 2023年第5期4卷 41-46页

作者： Yu-ang Fan Yingcheng Li Yuting Hu Yishan Li Xinyue Long Hongfeng Liu Xiaodong Yang Xinfang Nie Jun Li Tao Xin Dawei Lu Yidun Wan Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southem University of Science and Technology Shenzhen 518055China State Key Laboratory of Surface Physics Department of PhysicsCenter for Field Theory and Particle Physicsand Institute for Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433and Shanghai Qi Zhi InstituteShanghai 200030China School of Physics Hangzhou Normal UniversityHangzhou 311121China

Topological quantum computation(TQC)is one of the most striking architectures that can realize fault-tolerant quantum *** TQC,the logical space and the quantum gates are topologically protected,i.e.,robust against local *** topological protection,however,requires complicated lattice models and hard-to-manipulate dynamics;even the simplest system that can realize universal TQC-the Fibonacci anyon system—lacks a physical realization,let alone braiding the non-Abelian ***,we propose a disk model that can simulate the Fibonacci anyon system and construct the topologically protected logical spaces with the Fibonacci *** braiding the Fibonacci anyons,we can implement universal quantum gates on the logical *** disk model merely requires two physical qubits to realize three Fibonacci anyons at the *** 15 sequential braiding operations,we construct a topologically protected Hadamard gate,which is to date the least-resource requirement for *** showcase,we implement a topological Hadamard gate with two nuclear spin qubits,which reaches 97.18%fidelity by randomized *** further prove by experiment that the logical space and Hadamard gate are topologically protected:local disturbances due to thermal fluctuations result in a global phase *** a platform-independent proposal,our work is a proof of principle of TQC and paves the way toward fault-tolerant quantum computation.

关键词： Fibonacci Hadamard TQC

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First results of terrestrial gamma-ray flash observed by Insight-HXMT

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Science China(physics,Mechanics & Astronomy) 2025年第5期68卷 113-124页

作者： Qibin Yi Yi Zhao Shaolin Xiong Xuejuan Yang Ce Cai Shuo Xiao Gang Li Gaopeng Lu Hongbo Zhang Fanchao Lyu Wei Xu Xiaobo Li Chengkui Li Mingyu Ge Haisheng Zhao Wangchen Xue Jiacong Liu Chao Zheng Yanqiu Zhang Chenwei Wang Wenjun Tan Shenglun Xie Yue Huang Zhi Chang Congzhan Liu Fangjun Lu Liming Song Yupeng Xu Zhen Zhang Shuangnan Zhang Tipei Li School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Computer and Information Dezhou UniversityDezhou 253023China College of Physics Hebei Normal UniversityShijiazhuang 050024China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550001China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing Joint Institute for Atmospheric SciencesNanjing 210000China Electronic Information School Wuhan UniversityWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China Institute of Astrophysics Central China Normal UniversityWuhan 430079China Department of Astronomy Tsinghua UniversityBeijing 100084China

As China's first X-ray astronomy satellite,the hard X-ray modulation telescope(Insight-HXMT)carries three sets of X-ray *** high energy X-ray telescope(Insight-HXMT/HE)could serve as an all-sky gamma-ray monitor with a detection area of up to 5000 cm2and energy range from about 200 ke V to 3 Me *** characteristics,together with the high orbital inclination angle(43°)of the satellite,make the HE very suitable for detecting terrestrial gamma-ray flashes(TGFs).In this work,we implemented a dedicated TGF search algorithm for Insight-HXMT/HE,and identified 282 bright TGFs in its first four years of *** made a systematic study on the properties of these TGFs,including trigger time,duration,intensity,as well as the lightning *** found that TGFs detected in mid-latitude regions(30°to 43°)are rare and they do not exhibit significantly different properties compared with TGFs in low-latitude(within 30°).Interestingly,the hardness ratio of TGF measured by Insight-HXMT/HE seems to be independent of the TGF duration,which differs from previous *** results show that,despite the dedicated design for astronomical observation,Insight-HXMT/HE is a versatile instrument to study energetic radiation phenomena from the Earth.

关键词： gamma-ray sources gamma-ray telescopes terrestrial atmosphere

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Preparation of graphene on SiC by laser-accelerated pulsed ion beams

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Chinese physics B 2021年第11期30卷 455-460页

作者： Danqing Zhou Dongyu Li Yuhan Chen Minjian Wu Tong Yang Hao Cheng Yuze Li Yi Chen Yue Li Yixing Geng Yanying Zhao Chen Lin Xueqing Yan Ziqiang Zhao State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Beijing Laser Acceleration Innovation Center HuairouBeijing 101400China Institute of Guangdong Laser Plasma Technology Guangzhou 510540China

Laser-accelerated ion beams(LIBs) have been increasingly applied in the field of material irradiation in recent years due to the unique properties of ultra-short beam duration, extremely high beam current, etc. Here we explore an application of using laser-accelerated ion beams to prepare graphene. The pulsed LIBs produced a great instantaneous beam current and thermal effect on the SiC samples with a shooting frequency of 1 Hz. In the experiment, we controlled the deposition dose by adjusting the number of shootings and the irradiating current by adjusting the distance between the sample and the ion source. During annealing at 1100℃, we found that the 190 shots ion beams allowed more carbon atoms to self-assemble into graphene than the 10 shots case. By comparing with the controlled experiment based on ion beams from a traditional ion accelerator, we found that the laser-accelerated ion beams could cause greater damage in a very short time. Significant thermal effect was induced when the irradiation distance was reduced to less than 1 cm, which could make partial SiC self-annealing to prepare graphene dots directly. The special effects of LIBs indicate their vital role to change the structure of the irradiation sample.

关键词： laser ion acceleration graphene self-annealing

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Neutron-induced nuclear recoil background in the PandaX-4T experiment

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Chinese physics C 2022年第11期46卷 262-274页

作者： Zhou Huang Guofang Shen Qiuhong Wang Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Yunhua Chen Chen Cheng Yunshan Cheng Xiangyi Cui Yingjie Fan Deqing Fang Changbo Fu Mengting Fu Lisheng Geng Karl Giboni Linhui Gu Xuyuan Guo Chencheng Han Ke Han Changda He Jinrong He Di Huang Yanlin Huang Ruquan Hou Xiangdong Ji Yonglin Ju Chenxiang Li Mingchuan Li Shu Li Shuaijie Li Qing Lin Jianglai Liu Xiaoying Lu Lingyin Luo Wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Ningchun Qi Zhicheng Qian Xiangxiang Ren Nasir Shaheed Changsong Shang Lin Si Wenliang Sun Andi Tan Yi Tao Anqing Wang Meng Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Weihao Wu Jingkai Xia Mengjiao Xiao Xiang Xiao Pengwei Xie Binbin Yan Xiyu Yan Jijun Yang Yong Yang Chunxu Yu Jumin Yuan Ying Yuan Dan Zhang Minzhen Zhang Peng Zhang Tao Zhang Li Zhao Qibin Zheng Jifang Zhou Ning Zhou Xiaopeng Zhou Yong Zhou School of Physics and Astronomy Shanghai Jiao Tong UniversityKey Laboratory for Particle Astrophysics and Cosmology(MoE)Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China School of Physics Beihang UniversityBeijing 102206China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary SciencShandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai200240China School of Physics Nankai UniversityTianjin 300071China School of Physics Peking UniversityBeijing 100871China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing102206China School of Physics and Microelectronics Zhengzhou UniversityZhengzhouHenan 450001China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China SJTU Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai200240China

Neutron-induced nuclear recoil background is critical to dark matter searches in the PandaX-4T liquid xenon *** this study,we investigate the features of neutron background in liquid xenon and evaluate its contribution in single scattering nuclear recoil events using three *** first method is fully based on Monte Carlo *** last two are data-driven methods that also use multiple scattering signals and high energy signals in the *** the PandaX-4T commissioning data with an exposure of 0.63 tonne-year,all these methods give a consistent result,i.e.,there are 1.15±0.57 neutron-induced backgrounds in the dark matter signal region within an approximated nuclear recoil energy window between 5 and 100 keV.

关键词： dark matter neutron background multiple scattering high energy gamma

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High energy gamma-ray emission detected by LHAASO from SNR G150.3+4.5 38

High energy gamma-ray emission detected by LHAASO from SNR G...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Zeng, Houdun Guo, Yingying Wu, Hanrong Su, Yang Liu, Siming Zhang, Yi Key Laboratory of Dark Matter and Space Astronomy Key Laboratory of Radio Astronomy Purple Mountain Observatory Chinese Academy of Sciences Jiangsu Nanjing210023 China Key Laboratory of Particle Astrophyics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China School of Physical Science and Technology Southwest Jiaotong University Sichuan Chengdu610031 China

Recent observations and theories suggest that GeV cosmic-rays are dominated by SNRs interacting with molecular clouds while TeV cosmic-ray may have significant contributions from other sources, such as PWNes. Now LHAASO-WCDA have enough significance with E=1 TeV for SNR G150.3+4.5. Its spatial distribution and extension are consistent with that of the radio and the GeV band revealed by Fermi, and the extension of about 1.5 degrees. A source inside SNR G150.3+4.5 is detected by LHAASO-KM2A with a total significance of 9.4 sigma for E > 25 TeV. The best-fit source location is (R.A., Dec.)= (66.63◦ ± 0.11◦, 54.63◦ ± 0.05◦), and the Gaussian extension is 0.32◦ ± 0.06◦. It is spatially coincident with 4FGL J0426.5+5434, which has a soft GeV spectrum reminiscent of a pulsar. The broadband nonthermal emission can be interpreted as a contribution of a supernova remnant and a PWNe or high density molecular clouds interacting with high energy proton. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic rays

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Development of Wolter-I x-ray focusing mirrors measurement device 8

Development of Wolter-I x-ray focusing mirrors measurement d...

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8th Asia Pacific Conference on Optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2023

作者： Liao, Qiuyan Xue, Jiadai Ding, Fei Bao, Xingyu Wu, Kaiji Gu, Dongyun Zhang, Zhichao Chen, Zhigao Li, Duo Wang, Bo Yang, Yanji Chen, Yong College of Mechanical Engineering Harbin Institute of Technology Harbin150001 China Key Laboratory for Particle Astro Institute of High Energy Physics Chinese Academy of Sciences Beijing10049 China

ISBN: (纸本)9781510672673

EP satellite is a scientific exploration satellite for time-domain astronomy and high-energy astrophysics, its function is to carry out high-energy transitory celestial body survey with the highest sensitivity in the soft X-ray band. EP will be equipped with two groups of x-rays focusing mirrors (each group contains 54 Wolter-I mirrors). An X-ray focusing mirror is used to collect X-ray radiation in the universe, and is the core component of an X-ray astronomical satellite observation payload. The current X-ray focusing mirrors are derived from the Wolter-I reflector, and the light is focused through the inner surface. The inner reflection surface is an optical free-form surface connected by parabolic and hyperbolic surfaces. Many conventional measurement methods are not applicable and difficult to measure. High precision contact measurement is easy to scratch the mirror surface, Therefore, noncontact measurement must be used. In this paper, we develop two non-contact surface precision measurement devices are developed to solve the problem of difficult measurement of the inner reflection surface of the X-ray focusing mirror. One is a rapid measurement device based on the principle of optical star measurement method, The other is to measure the mirror inner surface by a single point scan measurement, the optical triangulation method is selected as the principle of the measurement device. We then verified the measurement accuracy of the mirrors with a precision visible light test system. In order to further verify the measurement accuracy of the focusing mirrors, X-ray testing of the focusing mirror was carried out at the 100-meter vacuum X-ray calibration facility of the Institute of High Energy physics, Chinese Academy of Sciences. The X-ray measurement results are better than the project index requirements. © COPYRIGHT SPIE.

关键词： Astrophysics

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