检索结果-内蒙古大学图书馆

Geomagnetic Signal of Millicharged Dark Matter

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Arza, Ariel Gong, Yuanlin Shu, Jing Wu, Lei Yuan, Qiang Zhu, Bin Department of Physics Institute of Theoretical Physics Nanjing Normal University Nanjing210023 China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China Center for High Energy Physics Peking University Beijing100871 China Beijing Laser Acceleration Innovation Center Huairou Beijing101400 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China School of Physics Yantai University Yantai264005 China

Millicharge particles (mCPs) are viable dark matter candidates motivated by many standard model extensions. We show that despite of the tiny coupling with the photon, millicharged dark matters can convert efficiently to photons through annihilation processes in the Earth magnetic field background, which generates a monochromatic quasi static magnetic field signal with angular frequency being twice the millicharged particle mass. By recasting null results from the SuperMAG and the SNIPE Hunt collaborations, we constrain the effective charge of bosonic millicharged dark matter in the mass ranges 10−18−3.5×10−17 eV and 10−15−10−14 eV. Our bounds surpass current stellar cooling constraints by more than ten orders of magnitude, making this proposal a powerful tool to search for millicharged dark matter. Copyright © 2025, The Authors. All rights reserved.

关键词： Geomagnetism

Accelerating structure design and fabrication for KIPT and PAL XFEL

学校读者我要写书评

暂无评论

Chinese physics C 2015年第5期39卷 113-116页

作者：侯汨贺祥裴士伦那斌池云龙 Laboratory of Particle Acceleration Physics & Technology Institute of High Energy PhysicsChinese Academy of Sciences

ANL （Argonne National laboratory） and the National Science Center ＂Kharkov Institute of physics technology＂（NSC KIPT, Kharkov, Ukraine） jointly propose to design and build a 100 MeV/100 kW linear accelerator which will be used to drive the neutron source subcritical assembly. The linac has ahnost finished assembly in KIPT by a team from the Institute of High Energy physics （IHEP, Beijing, China）. The design and measurement result of the accelerating system of the linac will be described in this paper.

关键词： S-band accelerating structure BBU (beam break-up) effect neutron source

Science objectives of the Einstein Probe mission

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 1-60页

作者： Weimin Yuan Lixin Dai Hua Feng Chichuan Jin Peter Jonker Erik Kuulkers Yuan Liu Kirpal Nandra Paul O’Brien Luigi Piro Arne Rau Nanda Rea Jeremy Sanders Lian Tao Junfeng Wang Xuefeng Wu Bing Zhang Shuangnan Zhang Shunke Ai Johannes Buchner Esra Bulbul Hechao Chen Minghua Chen Yong Chen Yu-Peng Chen Alexis Coleiro Francesco Coti Zelati Zigao Dai Xilong Fan Zhou Fan Susanne Friedrich He Gao Chong Ge Mingyu Ge Jinjun Geng Giancarlo Ghirlanda Giulia Gianfagna Lijun Gou Sebastien Guillot´ Xian Hou Jingwei Hu Yongfeng Huang Long Ji Shumei Jia S.Komossa Albert K.H.Kong Lin Lan An Li Ang Li Chengkui Li Dongyue Li Jian Li Zhaosheng Li Zhixing Ling Ang Liu Jinzhong Liu Liangduan Liu Zhu Liu Jiawei Luo Ruican Ma Pierre Maggi Chandreyee Maitra Alessio Marino Stephen Chi-Yung Ng Haiwu Pan Surangkhana Rukdee Roberto Soria Hui Sun Pak-Hin Thomas Tam Aishwarya Linesh Thakur Hui Tian Eleonora Troja Wei Wang Xiangyu Wang Yanan Wang Junjie Wei Sixiang Wen Jianfeng Wu Ting Wu Di Xiao Dong Xu Renxin Xu Yanjun Xu Yu Xu Haonan Yang Bei You Heng Yu Yunwei Yu Binbin Zhang Chen Zhang Guobao Zhang Liang Zhang Wenda Zhang Yu Zhang Ping Zhou Zecheng Zou National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics University of Hong KongPokfulam RoadHong Kong 999077China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Astrophysics/IMAPP Radboud UniversityNijmegen6500 GLthe Netherlands SRON Netherlands Institute for Space ResearchLeiden2333 CAthe Netherlands ESA/ESTEC Noordwijk2201 AZthe Netherlands Max Planck Institute for Extraterrestrial Physics Garching85748Germany School of Physics and Astronomy University of LeicesterLeicesterLE17RHUK INAF-Istituto di Astrofisica e Planetologia Spaziali Rome00133Italy Institute of Space Sciences(ICE) CSICCampus UABBarcelonaE-08193Spain Institut d’Estudis Espacials de Catalunya(IEEC) BarcelonaE-08034Spain Department of Astronomy Xiamen UniversityXiamen 361005China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China Nevada Center for Astrophysics University of NevadaLas VegasNV 89154USA Department of Physics and Astronomy University of NevadaLas VegasNV 89154USA Department of Astronomy School of Physics and TechnologyWuhan UniversityWuhan 430072China School of Physics and Astronomy Yunnan UniversityKunming 650500China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Universit´e Paris Cit´e CNRSAstroparticule et CosmologieParisF-75013France Department of Astronomy University of Science and Technology of ChinaHefei 230026China Institute for Frontier in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Department of Astronomy Beijing Normal UniversityBeijing 100875China INAF-Osservatorio Astronomico di Brera Merate(LC)I-23807Italy INFN-sezione di Milano-Bicocca Milano(M

The Einstein Probe(EP)is an interdisciplinary mission of time-domain and X-ray *** with a wide-field lobstereye X-ray focusing imager,EP will discover cosmic X-ray transients and monitor the X-ray variability of known sources in 0.5-4 keV,at a combination of detecting sensitivity and cadence that is not accessible to the previous and current wide-field monitoring *** can perform quick characterisation of transients or outbursts with a Wolter-I X-ray telescope *** this paper,the science objectives of the EP mission are *** is expected to enlarge the sample of previously known or predicted but rare types of transients with a wide range of *** them,fast extragalactic transients will be surveyed systematically in soft X-rays,which includeγ-ray bursts and their variants,supernova shock breakouts,and the predicted X-ray transients associated with binary neutron star *** will detect X-ray tidal disruption events and outbursts from active galactic nuclei,possibly at an early phase of the flares for *** will monitor the variability and outbursts of X-rays from white dwarfs,neutron stars and black holes in our and neighbouring galaxies at flux levels fainter than those detectable by the current instruments,and is expected to discover new objects.A large sample of stellar X-ray flares will also be detected and *** the era of multi-messenger astronomy,EP has the potential of detecting the possible X-ray counterparts of gravitational wave events,neutrino sources,and ultra-high energyγ-ray and cosmic ray *** is expected to help advance the studies of extreme objects and phenomena revealed in the dynamic X-ray universe,and their underlying physical *** EP's strength in time-domain science,its follow-up telescope,with excellent performance,will also enable advances in many areas of X-ray astronomy.

关键词： Einstein Probe X-ray astronomy X-ray telescopes time-domain astronomy transients variability

Einstein Probe discovery of EP240408a:A peculiar X-ray transient with an intermediate timescale

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2025年第1期68卷 218-236页

作者： Wenda Zhang Weimin Yuan Zhixing Ling Yong Chen Nanda Rea Arne Rau Zhiming Cai Huaqing Cheng Francesco Coti Zelati Lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li Paul O’Brien Rongfeng Shen Xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang Lei Yang Bing Zhang Chen Zhang Shuang-Nan Zhang Yonghe Zhang Jie An David Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P.U.Fynbo Lluis Galbany Saurabh W.Jha Shuaiqing Jiang Albert Kong Erik Kuulkers Weihua Lei Wenxiong Li Bifang Liu Mingjun Liu Xing Liu Yuan Liu Zhu Liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei Zhu Hu Zou Congying Bao Fansheng Chen Houlei Chen Tianxiang Chen Wei Chen Yehai Chen Yifan Chen Chenzhou Cui Weiwei Cui Yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin Chengkui Li Junfei Li Longhui Li Maoshun Li Wei Li Zhengda Li Tianying Lian Congzhan Liu Heyang Liu Huaqiu Liu Fangjun Lu Laidan Luo Jia Ma Xuan Mao Haiwu Pan Xin Pan Liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang Juan Wang Lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang Juan Zhang Mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Institute of Space Sciences(ICE) CSICBarcelona E-08193Spain Institut d’Estudis Espacials de Catalunya(IEEC) Barcelona E-08034Spain Max Planck Institute for Extraterrestrial Physics Garching 85748Germany Innovation Academy for Microsatellites Chinese Academy of SciencesShanghai 201210China Department of Physics University of Hong KongHong Kong 999077China School of Physics and Astronomy University of LeicesterLeicester LE17RHUK School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China Department of Physics Anhui Normal UniversityWuhu 241002China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China Physics Department Tsinghua UniversityBeijing 100084China Nevada Center for Astrophysics University of Nevada Las VegasLas Vegas NV 89154USA Department of Physics and Astronomy University of Nevada Las VegasLas Vegas NV 89154USA South African Astronomical Observatory Cape Town 7935South Africa Department of Astronomy University of Cape TownRondebosch 7701South Africa Department of Physics University of the Free StateBloemfontein 9300South Africa Universit´e Paris Cit´e CNRSAstroparticule et CosmologieParis F-75013France Universit´e Paris Cit´e CEA Paris-SaclayIRFU/DAp-AIMGif-sur-Yvette 91191France Department of Astronomy Guangzhou UniversityGuangzhou 510006China Cosmic Dawn Center(DAWN) Copenhagen 2200Denmark Niels Bohr Institute University of CopenhagenCopenhagen 2200Denmark Department of Physics and Astronomy Rutgersthe State University of New JerseyPiscataway NJ 08854-8019USA Institute for Cosmic Ray Research The University of TokyoKashiwa City 277-8582Japan ESA/ESTEC Noordwijk 2201 AZThe Netherlands Department of Astronom

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe(EP)and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope(WXT)on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for 12 *** flare reached a peak flux of 3:9×10^(−9) erg cm^(−2) s^(−1) in 0.5-4 keV,∼300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 keV,with a power-law photon index varying within *** X-ray light curve shows a plateau lasting for∼4 d,followed by a steep decay till becoming undetectable∼10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of∼10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

关键词： X-ray transients Einstein Probe

Searching for neutrinoless double-beta decay of 136Xe with PandaX-4T

学校读者我要写书评

暂无评论

Science Bulletin 2025年

作者： Zhang, Shu Bo, Zihao Chen, Wei Chen, Xun Chen, Yunhua Cheng, Zhaokan Cui, Xiangyi Fan, Yingjie Fang, Deqing Gao, Zhixing Geng, Lisheng Giboni, Karl Guo, Xunan Guo, Xuyuan Guo, Zichao Han, Chencheng Han, Ke He, Changda He, Jinrong Huang, Di Huang, Houqi Huang, Junting Hou, Ruquan Hou, Yu Ji, Xiangdong Ji, Xiangpan Ju, Yonglin Li, Chenxiang Li, Jiafu Li, Mingchuan Li, Shuaijie Li, Tao Li, Zhiyuan Lin, Qing Liu, Jianglai Lu, Congcong Lu, Xiaoying Luo, Lingyin Luo, Yunyang Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Ning, Xuyang Pang, Binyu Qi, Ningchun Qian, Zhicheng Ren, Xiangxiang Shan, Dong Shang, Xiaofeng Shao, Xiyuan Shen, Guofang Shen, Manbin Sun, Wenliang Tao, Yi Wang, Anqing Wang, Guanbo Wang, Hao Wang, Jiamin Wang, Lei Wang, Meng Wang, Qiuhong Wang, Shaobo Wang, Siguang Wang, Wei Wang, Xiuli Wang, Xu Wang, Zhou Wei, Yuehuan Wu, Weihao Wu, Yuan Xiao, Mengjiao Xiao, Xiang Xiong, Kaizhi Xu, Yifan Yao, Shunyu Yan, Binbin Yan, Xiyu Yang, Yong Ye, Peihua Yu, Chunxu Yuan, Ying Yuan, Zhe Yun, Youhui Zeng, Xinning Zhang, Minzhen Zhang, Peng Zhang, Shibo Zhang, Tao Zhang, Wei Zhang, Yang Zhang, Yingxin Zhang, Yuanyuan Zhao, Li Zhou, Jifang Zhou, Jiaxu Zhou, Jiayi Zhou, Ning Zhou, Xiaopeng Zhou, Yubo Zhou, Zhizhen New Cornerstone Science Laboratory Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai201210 China School of Physics Sun Yat-sen University Guangzhou510275 China Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai200240 China Shanghai Jiao Tong University Sichuan Research Institute Chengdu610213 China Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province Xichang615000 China Yalong River Hydropower Development Company Chengdu610051 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai519082 China Department of Physics Yantai University Yantai264005 China Institute of Modern Physics Fudan University Shanghai200433 China School of Physics Beihang University Beijing102206 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing100191 China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing102206 China Institute of Modern Physics Chinese Academy of Sciences Huizhou516000 China SJTU Paris Elite Institute of Technology Shanghai Jiao Tong University Shanghai200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China Department of Physics University of Maryland College Park Maryland20742 United States School of Physics Nankai University Tianjin300071 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China Department of Modern Physics University of Science and Technology of China Hefei230026 China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary Science Shandong University Qingdao266237 China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong University Qingdao266237 China School of Physics Peking University Beijing100871 China College of Nuclear Technol

We report the search for neutrinoless double-beta decay of 136Xe from the PandaX-4T experiment with a 3.7-tonne natural xenon target. The data reconstruction and the background modeling are optimized in the MeV energy region. A blind analysis is performed with data from the commissioning run and the first science run. No significant excess of signal over the background is observed. A lower limit on the half-life of 136Xe neutrinoless double-beta decay is established to be 2.1×1024 yr at the 90% confidence level, with a 136Xe exposure of 44.6 kg⋅yr. Our result represents the most stringent constraint from a natural xenon detector to date. © 2025 Science China Press

关键词： Majorana neutrino Natural xenon detector Neutrinoless double-beta decay

Prediction of lithium isotope fluxes using data-driven production cross sections

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Zhao, Meng-Jie Bi, Xiao-Jun Fang, Kun Lv, Xing-Jian Yin, Peng-Fei Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China China Center of Advanced Science and Technology Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China

Galactic cosmic rays (CRs) generally share common propagation features, leading to consistent spectral observations of secondary nuclei such as Li, Be, and B. However, the Li spectrum predicted by the CR diffusion coefficient inferred from B/C is significantly lower than the latest measurement of AMS-02. This anomaly may be attributed to the missing contributions from the heavy nuclei components in cosmic rays. By including these missing contributions the excess of the Li spectrum disappears. However, another inconsistency still exists since the calculated Li spectrum is now overestimated compared to the data. In this work, we update the cross-section model used to calculate the Li production according to more cross-section measurements. We find that the cross sections of these added reactions are systematically overestimated, and should be renormalized to the interpolations of available data. As a result, our prediction of the total Li spectrum is consistent with the measurement without discrepancy, and our prediction of the 6Li and 7Li spectra are consistent with the preliminary measurements of AMS-02 within the cross-section uncertainties. © 2025, CC BY.

关键词： Cosmic rays

Deciphering the spectral bumps of Galactic cosmic rays through gamma-ray observations of nearby molecular clouds

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Lv, Xing-Jian Bi, Xiao-Jun Fang, Kun Yin, Peng-Fei Zhao, Meng-Jie Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China China Center of Advanced Science and Technology Beijing100190 China

The observed spectral bump in cosmic-ray (CR) proton and helium spectra, along with the phase and amplitude evolution of CR dipole anisotropy, provide plausible yet indirect evidence for the presence of a nearby CR source. This study investigates the potential of giant molecular clouds (GMCs) located near the solar system to act as natural probes of CRs from the nearby source, with their gamma-ray emissions serving as indicators of spatial variations in CR flux within the solar neighborhood resulting from this source. We show that a nearby source, accounting for the CR data, could imprint distinct features on the γ-ray spectra of different GMCs. We expect that these features are detectable by LHAASO and upcoming high-energy γ-ray observatories, providing a powerful test for the hypothesized nearby source. Notably, we find that determining the energy dependence of the γ-ray spectral index offers a promising approach to investigate the nearby source and constrain its distance. Conversely, if the spectral bump is a widespread Galactic phenomenon, the energy dependence would exhibit uniformity across all GMCs, distinguishing the underlying mechanism accounting for the spectral bump from the scenario involving a nearby source. © 2025, CC BY.

关键词： Gamma rays

Spectral analysis of the X-ray flares in the 2023 outburst of the new black binary transient Swift J1727.8–1613 observed with Insight-HXMT

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Cao, Jia-Ying Liao, Jin-Yuan Zhang, Shuang-Nan Feng, Hua Qu, Jin-Lu Zhang, Liang Liu, He-Xin Yu, Wei Zhao, Qing-Chang Peng, Jing-Qiang Ge, Ming-Yu Tao, Lian Xu, Yan-Jun Zhang, Shu Yang, Zi-Xu Key Laboratory for Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences 19B Yuquan Road Beijing100049 China University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing100049 China Key Laboratory of Space Astronomy and Technology National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China School of Physics and Optoelectronic Engineering Shandong Unversity of Technology Zibo255000 China

The new black hole transient Swift J1727.8–1613 exhibited a series of X-ray flares during its 2023 outburst extensively observed with Insight-HXMT. We analyze the spectra of the flaring period using a series of models consisting of a multi-color disk and several different non-thermal components, and several consistent conclusions are obtained among these models. First, Swift J1727.8–1613 was in the transition process from the hard intermediate state (HIMS) to the very high state (VHS) during the first flaring period (MJD 60197–60204), and afterwards it exhibited typical VHS parameter characteristics, such as high temperature of the disk inner radius and a steep power-law spectrum with a photon index of 2.6. Second, the flares in the VHS are characterized by a rapid increase in the flux of accretion disk, accompanied by a simultaneous rapid expansion of the inner radius, which could be apparent if the accretion disk hardening factor varies significantly. The strong power-law component during the VHS is likely produced by synchrotron self-Compton process in the relativistic jets, in agreement with the observed weak reflection component and lack of correlation with the disk component. Copyright © 2025, The Authors. All rights reserved.

关键词： Stars

MTCA.4-based LLRF control system for the C-ADS proton Linac injector I

学校读者我要写书评

暂无评论

Radiation Detection technology and Methods 2017年第1期1卷 13-20页

作者： R.Liu X.P.Ma N.Gan H.Y.Lin Q.Y.Wang Z.H.Mi S.Z.Wang X.F.Huang Yan Wu G.W.Wang Y.L.Chi Weimin Pan Key Laboratory of Particle Acceleration Physics and Technology IHEPCASBeijing 100049China

Objective:The Chinese ADS proton Linac injector I composed of an electron cyclotron resonance ion source,a lowenergy beam transport line,a radio frequency quadrupole(RFQ)accelerator,a medium-energy beam transport(MEBT)line,a superconducting section and beam dump with design goal to achieve CW proton beam with beam current 10 mA and energy gain around 10 *** order to maintain the stability of the RF system,to compensate for the beam load effect and to provide the GUI required for the operation of the RF power system,we have established a LLRF control ***:This LLRF system for ADS proton Linac injector I in IHEP consists of RF reference system and LLRF controllers for oneRFQcavity,twoMEBTbunching cavities and 14 superconductive spoke *** have adopted a new development mTCA.4-based hardware platform,and it has some characteristics such as faster bandwidth,standardized design,easy operation and maintenance and good ***:The LLRF system has been improved and optimized and has now been put into *** takes into account the pulse and CW beam flow mode,feedforward and feedback control ***:With the help of this system,we achieved stable operationwith narrowpulses,long pulses,andCWmodes under different beam *** article describes the implementation of this system and presents some initial the CW beam acceleration results with the help of this system at the end of 2016.

关键词： RF system RFQ Spoke cavity LLRF MTCA.4 CW proton beam