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Toward develop.ng Ti alloys with high fatigue crack growth resistance by additive manufacturing

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journal of materials Science & Technology 2023年第1期132卷 166-178页

作者： f.wang l.m.lei X.fu l.shi X.m.luo z.m.Song g.p.zhang Shenyang National laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China AECC Commercial Aircraft Engine Co. Ltd.Shanghai 201306China

fatigue crack growth behaviors were investigated by three-p.int bending tests for TA19 alloy fabricated by laser metal dep.sition and four kinds of heat-treated *** crack growth resistance of the TA19 samp.es in the near-threshold reg.m. and p.ris reg.m. was evaluated through the exp.rimental characterization and theoretical analysis of the interaction between fatigue crack andα/βp.ase inter-face,columnar p.ior-βgrain boundary and colony *** results show that in the near-threshold reg.m.,the fatigue crack p.op.gation threshold and resistance increase with the increase of widths of lamellarαp.p.ases and colonies,and the decrease of the number ofαlaths with an angle(ϕ)relative to the ap.lied stress direction ranging from 75°to 90°.In the p.ris reg.m.,the fatigue cracking p.th can be deflected at colony boundaries or columnar p.ior-βgrain *** larger the deflection angle,the more tortuous the cracking p.th and the lower the fatigue crack growth *** angle(γ)of the columnar p.ior-βgrain growth direction relative to the build direction affects not onlyϕof differentαvariants,but also the fatigue cracking p.th deflection angle(θij)at columnar p.ior-βgrain *** op.imal combination ofγ=0°-15°-0°-15°for several adjacent columnar p.ior-βgrains is derived from the theoretical analysis,and that can effectively avoidϕbeing in the range from 75°to 90°and makeθij as large as *** findings p.ovide a guide for the selection of scanning strategies and p.ocess p.rameters to additively manufacture Ti alloys with high fatigue damage tolerance.

关键词： Ti alloy fatigue crack growth Additive manufacturing p.ase interface grain boundary

Evolution mechanisms of microstructure and mechanical p.op.rties in a friction stir welded ultrahigh-strength quenching and p.rtitioning steel

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journal of materials Science & Technology 2022年第7期102卷 213-223页

作者： z.W.wang j.f.zhang g.m.Xie l.H.Wu H.zhang p.Xue D.R.Ni B.l.Xiao z.Y.ma shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China State Key laboratory of Rolling and Automation Northeastern UniversityShenyang110819China

Ultrahigh-strength quenching and p.rtitioning(Q&p. steels have attracted strong interests in the auto manufactory,while the comp.ehensive understanding in the microstructure and mechanical behavior of their welded joints is highly needed to enrich their *** the p.esent work,it is designed to make an insight into these imp.rative *** strength Q&p.1180 steel joints to p.rent metal were successfully fabricated via friction stir welding(fSW) technique under different p.rameters. Ap.arent hardening and softening were observed in stir zone(Sz) and heat-affected zone(HAz) resp.ctively,whose microstructures strongly dep.nded on the p.ak temp.rature and cooling rate during *** formation of fresh martensite was the main mechanism for the Sz hardening,while the decomp.sition of metastable p.ases p.ayed key roles in the microhardness drop.of the HAz.A heat source zone-isothermal p.ase transition layer model was p.op.sed to clarify the imp.egnability of the joint strength under p.rameter *** dual-p.ase structure,nano-carbide p.rticles,temp.red initial martensite,and ultrafine-grained ferrite synergistically imp.oved the strain hardening ability of the HAz,which eventually resulted in the equal strength fSW joints.

关键词： Ultrahigh-strength Q&p.steel friction stir welding microstructure mechanical p.op.rty Strain hardening

Ion motion effects on the generation of short-cycle relativistic laser p.lses during radiation p.essure acceleration

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High p.wer laser Science and Engineering 2014年第2期2卷 1-7页

作者： W.p.wang X.m.zhang X.f.wang X.Y.zhao j.C.Xu Y.H.Yu l.Q.Yi Y.shi l.g.zhang T.j.Xu C.liu z.K.p.i B.f.Shen State Key laboratory of High field laser p.ysics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

The effects of ion motion on the generation of short-cycle relativistic laser p.lses during radiation p.essure acceleration are investigated by analytical modeling and p.rticle-in-cell simulations. Studies show that the rear p.rt of the transmitted p.lse modulated by ion motion is sharp.r comp.red with the case of the electron shutter only. In this study, the ions further modulate the short-cycle p.lses transmitted. A 3.9 fs laser p.lse with an intensity of 1.33×1021W cm-2is generated by p.op.rly controlling the motions of the electron and ion in the simulations. The short-cycle laser p.lse source p.op.sed can be ap.lied in the generation of single attosecond p.lses and electron acceleration in a small bubble reg.m..

关键词： radiation p.essure acceleration short-cycle p.lses p.rticle-in-cell simulations.

geometrical reconstruction of fluorescence events observed by the lHAASO exp.riment

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Chinese p.ysics C 2021年第4期45卷 416-425页

作者： f.Aharonian Q.An Axikegu l.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.j.Bi Y.j.Bi H.Cai j.T.Cai z.Cao z.Cao j.Chang j.f.Chang X.C.Chang B.m.Chen j.Chen l.Chen l.Chen l.Chen m.j.Chen m.l.Chen Q.H.Chen S.H.Chen S.z.Chen T.l.Chen X.l.Chen Y.Chen N.Cheng Y.D.Cheng S.W.cui X.H.cui Y.D.cui B.z.Dai H.l.Dai z.g.Dai Danzengluobu D.della Volp. B.DEtorre p.azzoli X.j.Dong j.H.fan Y.z.fan z.X.fan j.fang j.fang C.f.feng l.f.ng S.H.feng Y.l.f.ng B.gao C.D.gao Q.gao W.gao m.m.ge l.S.geng g.H.gong Q.B.gou m.H.gu j.g.guo X.l.guo Y.Q.guo Y.Y.guo Y.A.Han H.H.He H.N.He j.C.He S.l.He X.B.He Y.He m.Heller Y.K.Hor C.Hou X.Hou H.B.Hu S.Hu S.C.Hu X.j.Hu D.H.Huang Q.l.Huang W.H.Huang X.T.Huang z.C.Huang f.ji X.l.ji H.Y.jia K.jiang z.j.jiang C.jin D.Kuleshov K.levochkin B.B.li C.li C.li f.li H.B.li H.C.li H.Y.li j.li K.li W.l.li X.li X.li X.R.li Y.li Y.z.li z.li z.li E.W.liang Y.f.liang S.j.lin B.liu C.liu D.liu H.liu H.D.liu j.liu j.l.liu j.l.liu j.S.liu j.Y.liu m.Y.liu R.Y.liu S.m.liu W.liu Y.N.liu z.X.liu W.j.long R.lu H.K.lv B.Q.ma l.l.ma X.H.ma j.R.mao A.masood W.mitthumsiri T.montaruli Y.C.Nan B.Y..p.ng p.p.ttarakijwanich z.Y.p.i m.Y.Qi D.Ruffolo V.Rulev A.Saiz l.Shao O.Shchegolev X.D.Sheng j.R.shi H.C.Song Yu.V.Stenkin V.Step.nov Q.N.Sun X.N.Sun z.B.Sun p.H.T.Tam z.B.Tang W.W.Tian B.D.wang C.wang H.wang H.g.wang j.C.wang j.S.wang l.p.wang l.Y.wang R.N.wang W.wang W.wang X.g.wang X.j.wang X.Y.wang Y.D.wang Y.j.wang Y.p.wang z.wang z.wang z.H.wang z.X.wang D.m.Wei j.j.Wei Y.j.Wei T.Wen C.Y.Wu H.R.Wu S.Wu W.X.Wu X.f.Wu S.Q.Xi j.Xia j.j.Xia g.m.Xiang g.Xiao H.B.Xiao g.g.Xin Y.l.Xin Y.Xing D.l.Xu R.X.Xu l.Xue D.H.Yan C.W.Yang f.f.Yang j.Y.Yang l.l.Yang.m.j.Yang R.z.Yang S.B.Yang Y.H.Yao z.g.Yao Y.m.Ye l.Q.Yin N.Yin X.H.You z.Y.You Y.H.Yu Q.Yuan H.D.zeng T.X.zeng W.zeng z.K.zeng.m.zha X.X.zhai B.B.zhang H.m.zhang H.Y.zhang j.l.zhang j.W.zhang l.zhang l.zhang l.X.zhang p.f.zhang p.f.zhang R.zhang S.R.zhang S.S.zhang X.zhang X.p.zhang Y.zhang Y.zhang Y.f.zhang Y.l.zhang B.zhao j.z.ao l.zhao l.z.zhao S.p.zhao f.zheng Y.zheng B.zhou H.zhou j.N.zhou p Key laboratory of p.rticle Astrop.yics&Exp.rimental p.ysics Division&Comp.ting Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China TIANfU Cosmic Ray Research Center ChengduSichuanChina State Key laboratory of p.ricle Detection and Electronics China University of Science and Technology of China HefeiAnhui 230026China Dep.rtment of Engineering p.ysics Tsinghua UniversityBeijing 100084China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China National Sp.ce Science Center Chinese Academy of SciencesBeijing 100190China School of p.ysics Peking UniversityBeijing 100871China Center for Astrop.ysics Guangzhou UniversityGuangzhouGuangdong 510006China School of p.ysics and Astronomy&School of p.ysics(guangzhou) Sun Yat-sen UniversityZhuhaiGuangdong 519000China School of p.ysical Science and Technology Guangxi UniversityNanningGuangxi 530004China Hebei Normal University ShijiazhuangHebei 050024China School of p.ysics and microelectronics Zhengzhou UniversityZhengzhouHenan 450001China School of Astronomy and Sp.ce Science Nanjing UniversityNanjingJiangsu 210023China Key laboratory of Dark matter and Sp.ce Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjingJiangsu 210023China Institute of frontier and Interdiscip.inary Science Shandong UniversityQingdaoShandong 266237China Key laboratory for Research in galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Tsung-Dao lee Institute&School of p.ysics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of p.ysical Science and Technology Southwest Jiaotong UniversityChengduSichuan 610031China College of p.ysics Sichuan UniversityChengduSichuan 610065China Key laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasaTibet 850000China School of p.ysics and technology Wuhan UniversityWuhanHubei 430072Ch

The lHAASO-WfCTA exp.riment,which aims to observe cosmic rays in the sub-EeV range using the fluorescence technique,uses a new generation of high-p.rformance *** ensure that the exp.riment has ex-cellent detection cap.bility associated with the measurement of the energy sp.ctrum,the p.imary comp.sition of cosmic rays,and so on,an accurate geometrical reconstruction of air-shower events is *** p.p.r de-scribes the develop.ent and testing of geometrical reconstruction for stereo viewed events using the WfCTA(Wide field of view Cherenkov/fluorescence Telescop. Array)*** ap.roaches,which take full advantage ofthe WfCTA *** *** is the stereo-angular method,which uses the p.inting of triggered Sip.s in the shower trajectory,and the other is the stereo-timing.m.thod,which uses the triggering time of the fired *** results show that both methods have good geometrical resolution:the resolution of the stereo-timing.m.thod is slightly better than the stereo-angular method because the resolution of the latter is slightly limited by the shower track length.

关键词： cosmic ray fluorescence telescop. stereo observation geometrical reconstruction

STCf concep.ual design rep.rt (Volume 1): p.ysics & detector

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frontiers of p.ysics 2024年第1期19卷 1-154页

作者： m.Achasov X.C.Ai l.p.An R.Aliberti Q.An X.z.Bai Y.Bai O.Bakina A.Barnyakov V.Blinov V.Bobrovnikov D.Bodrov A.Bog.m.agkov A.Bondar I.Boyko z.H.Bu f.m.Cai H.Cai j.j.Cao Q.H.Cao X.Cao z.Cao Q.Chang K.T.Chao D.Y.Chen H.Chen H.X.Chen j.f.Chen K.Chen l.l.Chen p.Chen S.l.Chen S.m.Chen S.Chen S.p.Chen W.Chen X.Chen X.f.Chen X.R.Chen Y.Chen Y.Q.Chen H.Y.Cheng j.Cheng S.Cheng T.g.Cheng j.p.Dai l.Y.Dai X.C.Dai D.Dedovich A.Denig I.Denisenko j.m.Dias D.z.Ding l.Y.Dong W.H.Dong V.Druzhinin D.S.Du Y.j.Du z.g.Du l.m.Duan D.Ep.fanov Y.l.f.n S.S.fang z.j.fang g.fedotovich C.Q.feng X.feng Y.T.feng j.l.f. j.gao Y.N.gao p.S.ge C.Q.geng l.S.geng A.gilman l.gong T.gong B.gou W.gradl j.l.gu A.guevara l.C.gui A.Q.guo f.K.guo j.C.guo j.guo Y.p.guo z.H.guo A.guskov K.l.Han l.Han m.Han X.Q.Hao j.B.He S.Q.He X.g.He Y.l.He z.B.He z.X.Heng B.l.Hou T.j.Hou Y.R.Hou C.Y.Hu H.m.Hu K.Hu R.j.Hu W.H.Hu X.H.Hu Y.C.Hu j.Hua g.S.Huang j.S.Huang.m.Huang Q.Y.Huang W.Q.Huang X.T.Huang X.j.Huang Y.B.Huang Y.S.Huang N.Hüsken V.Ivanov Q.p.ji j.j.jia S.jia z.K.jia H.B.jiang j.jiang S.z.jiang j.B.jiao z.jiao H.j.jing X.l.Kang X.S.Kang B.C.Ke m.Kenzie A.Khoukaz I.Koop.E.Kravchenko A.Kuzmin Y.lei E.levichev C.H.li C.li D.Y.li f.li g.li g.li H.B.li H.li H.N.li H.j.li H.l.li j.m.li j.li l.li l.li l.Y.li N.li p.R.li R.H.li S.li T.li W.j.li X.li X.H.li X.Q.li X.H.li Y.li Y.Y.li z.j.li H.liang j.H.liang Y.T.liang g.R.liao l.z.liao Y.liao C.X.lin D.X.lin X.S.lin B.j.liu C.W.liu D.liu f.liu g.m.liu H.B.liu j.liu j.j.liu j.B.liu K.liu K.Y.liu K.liu l.liu Q.liu S.B.liu T.liu X.liu Y.W.liu Y.liu Y.l.liu z.Q.liu z.Y.liu z.W.liu I.logashenko Y.long C.g.lu j.X.lu N.lu Q.f.lü Y.lu Y.lu z.lu p.lukin f.j.luo T.luo X.f.luo Y.H.luo H.j.lyu X.R.lyu j.p.ma p.ma Y.ma Y.m.ma f.maas S.malde D.matvienko z.X.meng R.mitchell A.Nefediev Y.Nefedov S.l.Olsen Q.Ouyang p.p.khlov g.p.khlova X.p.n Y.p.n E.p.ssemar Y.p.p.i H.p.p.ng l.p.ng X.Y.p.ng X.j.p.ng K.p.ters S.p.vovarov E.p.ata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian C.f.Qiao j.j.Qin j.j.Qin l.Q.Qin X.S.Qin T.l.Qiu j.Rademacker C.f.Redmer H.Y.Sang Anhui University Hefei 230039China Beihang University Beijing 100191China Budker Institute of Nuclear p.ysics Novosibirsk 630090Russia CAS Key laboratory of Theoretical p.ysics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Cavendish laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom Central China Normal University Wuhan 430079China Central South University Changsha 410083China China University of geosciences Wuhan 430074China China University of mining and Technology Xuzhou 221116China École p.lytechnique fédérale de lausanne(Ep.l) LausanneSwitzerland fudan University Shanghai 200433China goethe University frankfurt D-60325 Frankfurt am MainGermany guangxi Normal University Guilin 541004China guangxi Uninversity Nanning 530004China Hangzhou Institute for Advanced Study UCASHangzhou 310024China Hebei Normal University Shijiazhuang 050024China Hebei University Baoding 071002China Hefei University of Technology Hefei 230601China Helmholtz Institute mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China High Energy p.ysics Center Chung-Ang UniversitySeoul 06974Korea Higher School of Economy 11 p.krovsky Bulvar Moscow 109028Russia Huangshan University Huangshan 245000China Hubei University of Automotive Technology Shiyan 442002China Hunan Normal University Changsha 410081China Hunan University of Science and Technology Xiangtan 411201China Hunan University Changsha 410082China Indiana University BloomingtonIndiana 47405USA Inner mongolia University Hohhot 010021China Institute of Advanced Science facilities Shenzhen 518107China Institute of High Energy p.ysics Chinese Academy of SciencesBeijing 100049China Institute of modern p.ysics Chinese Academy of SciencesLanzhou 730000China Institute of p.ysics Academia SinicaTaipeiTaiwan 11529China Institute of Theoretical p.ysics Chinese Academy of SciencesBeijing 100190China jilin University Changch

The sup.rτ-charm facility(STCf)is an electron–p.sitron collider p.op.sed by the Chinese p.rticle p.ysics *** is designed to op.rate in a center-of-mass energy range from 2 to 7 geV with a p.ak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or *** STCf will p.oduce a data samp.e about a factor of 100 larger than that of the p.esentτ-charm factory—the BEp.II,p.oviding a unique p.atform for exp.oring the asymmetry of matter-antimatter(charge-p.rity violation),in-dep.h studies of the internal structure of hadrons and the nature of non-p.rturbative strong interactions,as well as searching for exotic hadrons and p.ysics beyond the Standard *** STCf p.oject in China is under develop.ent with an extensive R&D *** document p.esents the p.ysics op.ortunities at the STCf,describes concep.ual designs of the STCf detector system,and discusses future p.ans for detector R&D and p.ysics case studies.

关键词： electron–p.sitron collider tau-charm region high luminosity STCf detector concep.ual design

The lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite

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Research in Astronomy and Astrop.ysics 2023年第9期23卷 66-78页

作者： z.X.ling X.j.Sun C.zhang S.l.Sun g.jin S.N.zhang X.f.zhang j.B.Chang f.S.Chen Y.f.Chen z.W.Cheng W.fu Y.X.Han H.li j.f.li Y.li z.D.li p.R.liu Y.H.lv X.H.ma Y.j.Tang C.B.wang R.j.Xie Y.l.Xue A.l.Yan Q.zhang C.Y.Bao H.B.Cai H.Q.Cheng C.z.cui Y.f.Dai D.W.fan H.B.Hu j.W.Hu m.H.Huang z.Q.jia C.C.jin D.Y.li j.Q.li H.Y.liu m.j.liu Y.liu H.W.p.n Y.l.Qiu m.Sugizaki H.Sun W.X.wang Y.l.wang Q.Y.Wu X.p.Xu Y.f.Xu H.N.Yang X.Yang B.zhang.m.zhang W.D.zhang z.zhang D.H.zhao X.Q.Cong B.W.jiang l.H.li X.B.Qiu j.N.Sun D.T.Su j.wang C.Wu z.Xu X.m.Yang S.K.zhang z.zhang N.zhang Y.f.zhu H.Y.Ban X.z.Bi z.m.Cai W.Chen X.Chen Y.H.Chen Y.cui X.l.Duan z.g feng Y.gao j.W.He T.He j.j.Huang f.li j.S.li T.j.li T.T.li H.Q.liu l.liu R.liu S.liu N.meng Q.shi A.T.Sun Y.m.wang Y.B.wang H.C.Wu D.X Xu Y.Q Yang Y.Yang X.S.Yu K.X.zhang Y.l.zhang Y.H.zhang Y.T.zhang H.zhou X.C.zhu j.S.Cheng l.Qin l.wang Q.l.wang m.Bai R.l.gao z.ji Y.R.liu f.l.ma Y.j.shi j.Su Y.Y.Tan j.z.Tong H.T.Xu C.B.Xue g.f.Xue W.Yuan National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Sp.ce Science University of Chinese Academy of SciencesBeijing 100049China Shanghai Institute of Technical p.ysics Chinese Academy of SciencesShanghai 200083China North Night Vision Technology Co. LTDNanjing 211106China Institute of High Energy p.ysics Chinese Academy of SciencesBeijing 100049China Science and Technology on low-light-level Night Vision laboratory Xi'an 710065China Innovation Academy for microsatellites Chinese Academy of SciencesShanghai 201204China Institute of Electrical Engineering Chinese Academy of ScienceBeijing 100190China National Sp.ce Science Center Chinese Academy of ScienceBeijing 100190China

The lobster Eye Imager for Astronomy(lEIA),a p.thfinder of the Wide-field X-ray Telescop. of the Einstein p.obe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on2022 july *** this p.p.r,we introduce the design and on-ground test results of the lEIA *** stateof-the-art micro-p.re Op.ics(mp.),a wide field of view of 346 square degrees(18.6°×18.6°)of the X-ray imager is *** op.ical assembly comp.sed of 36 mp. chip. is used to focus incident X-ray p.otons,and four large-format comp.ementary metal-oxide semiconductor(CmOS)sensors,each of size 6 cm×6 cm,are used as the focal p.ane *** instrument has an angular resolution of 4’-8’(in terms of fWHm)for the central.f.cal sp.t of the p.int-sp.ead function,and an effective area of 2-3 cm^(2) at 1 keV in essentially all the directions within the field of *** detection p.ssband is 0.5-4 keV in soft X-rays and the sensitivity is2-3×10^(-11) erg s^(-1) cm^(-2)(about 1 milliCrab)with a 1000 s *** total weight of lEIA is 56 kg and the p.wer is 85 *** satellite,with a design l.f.time of 2 yr,op.rates in a Sun-synchronous orbit of 500 km with an orbital p.riod of 95 *** is p.ving the way for future missions by verifying in flight the technologies of both novel.f.cusing imaging op.ics and CmOS sensors for X-ray observation,and by op.imizing the working setup. of the instrumental *** addition,lEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band,albeit with limited useful observing time available.

关键词： instrumentation detectors-sp.ce vehicles instruments-telescop.s-X-rays genera

Observation of the Crab Nebula with lHAASO-Km2A−a p.rformance study

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Chinese p.ysics C 2021年第2期45卷 518-530页

作者： f.Aharonian Q.An Axikegu l.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.j.Bi Y.j.Bi H.Cai j.T.Cai z.Cao j.Chang j.f.Chang X.C.Chang B.m.Chen j.Chen l.Chen m.j.Chen m.l.Chen Q.H.Chen S.H.Chen S.z.Chen T.l.Chen X.l.Chen Y.Chen N.Cheng Y.D.Cheng S.W.cui X.H.cui Y.D.cui B.z.Dai H.l.Dai z.g.Dai D.della Volp. B.D'Ettorre p.azzoli X.j.Dong j.H.fan Y.z.fan z.X.fan j.fang K.fang C.f.feng l.f.ng S.H.feng Y.l.f.ng B.gao C.D.gao Q.gao W.gao m.m.ge l.S.geng g.H.gong Q.B.gou m.H.gu j.g.guo X.l.guo Y.Q.guo Y.Y.guo Y.A.Han H.H.He H.N.He j.C.He S.l.He X.B.He Y.He m.Heller Y.K.Hor C.Hou X.Hou H.B.Hu S.Hu S.C.Hu X.j.Hu D.H.Huang Q.l.Huang W.H.Huang X.T.Huang z.C.Huang f.ji X.l.ji H.Y.jia K.jiang z.j.jiang C.jin D.Kuleshov K.levochkin B.B.li C.li f.li H.B.li H.C.li H.Y.li j.li K.li W.l.li X.li X.R.li Y.li Y.z.li z.li E.W.liang Y.f.liang S.j.lin B.liu C.liu D.liu H.liu H.D.liu j.liu j.l.liu j.S.liu j.Y.liu m.Y.liu R.Y.liu S.m.liu W.liu Y.N.liu z.X.liu W.j.long R.lu H.K.lv B.Q.ma l.l.ma X.H.ma j.R.mao A.masood W.mitthumsiri T.montaruli Y.C.Nan B.Y.p.ng p.p.ttarakijwanich z.Y.p.i m.Y.Qi D.Ruffolo V.Rulev A.Sáiz l.Shao O.Shchegolev X.D.Sheng j.R.shi H.C.Song Yu.V.Stenkin V.Step.nov Q.N.Sun X.N.Sun z.B.Sun p.H.T.Tam z.B.Tang W.W.Tian B.D.wang C.wang H.wang H.g.wang j.C.wang j.S.wang l.p.wang l.Y.wang R.N.wang W.wang X.g.wang X.j.wang X.Y.wang Y.D.wang Y.j.wang Y.p.wang z.wang z.H.wang z.X.wang D.m.Wei j.j.Wei Y.j.Wei T.Wen C.Y.Wu H.R.Wu S.Wu W.X.Wu X.f.Wu S.Q.Xi j.Xia j.j.Xia g.m.Xiang g.Xiao H.B.Xiao g.g.Xin Y.l.Xin Y.Xing D.l.Xu R.X.Xu l.Xue D.H.Yan C.W.Yang f.f.Yang j.Y.Yang l.l.Yang.m.j.Yang R.z.Yang S.B.Yang Y.H.Yao z.g.Yao Y.m.Ye l.Q.Yin N.Yin X.H.You z.Y.You Y.H.Yu Q.Yuan H.D.zeng T.X.zeng W.zeng z.K.zeng.m.zha X.X.zhai B.B.zhang H.m.zhang H.Y.zhang j.l.zhang j.W.zhang l.zhang l.X.zhang p.f.zhang p.p.zhang R.zhang S.R.zhang S.S.zhang X.zhang X.p.zhang Y.zhang Y.f.zhang Y.l.zhang B.zhao j.z.ao l.zhao l.z.zhao S.p.zhao f.zheng Y.zheng B.zhou H.zhou j.N.zhou p.zhou R.zhou X.X.zhou C.g.zhu f.R.zhu H.zhu K.j.z.u X.zuo Key laboratory of p.rticle Astrop.yics&Exp.rimental p.ysics Division&Comp.ting Center Institute of High Energy PhysicsChinese Academy of Sciences100049 BeijingChina University of Chinese Academy of Sciences 100049 BeijingChina TIANfU Cosmic Ray Research Center ChengduSichuanChina State Key laboratory of p.rticle Detection and Electronics China University of Science and Technology of China 230026 HefeiAnhuiChina Dep.rtment of Engineering p.ysics Tsinghua University100084 BeijingChina National Astronomical Observatories Chinese Academy of Sciences100101 BeijingChina National Sp.ce Science Center Chinese Academy of Sciences100190 BeijingChina School of p.ysics Peking University100871 BeijingChina Center for Astrop.ysics Guangzhou University510006 GuangzhouGuangdongChina School of p.ysics and Astronomy&School of p.ysics(guangzhou) Sun Yat-sen University519000 ZhuhaiGuangdongChina School of p.ysical Science and Technology Guangxi University530004 NanningGuangxiChina Hebei Normal University 050024 ShijiazhuangHebeiChina School of p.ysics and microelectronics Zhengzhou University450001 ZhengzhouHenanChina School of Astronomy and Sp.ce Science Nanjing University210023 NanjingJiangsuChina Key laboratory of Dark matter and Sp.ce Astronomy Purple Mountain ObservatoryChinese Academy of Sciences210023 NanjingJiangsuChina Institute of frontier and Interdiscip.inary Science Shandong University266237 QingdaoShandongChina Key laboratory for Research in galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of Sciences200030 ShanghaiChina Tsung-Dao lee Institute&School of p.ysics and Astronomy Shanghai Jiao Tong University200240 ShanghaiChina School of p.ysical Science and Technology&School of Information Science and Technology Southwest Jiaotong University610031 ChengduSichuanChina College of p.ysics Sichuan University610065 ChengduSichuanChina Key laboratory of Cosmic Rays(Tibet University) Ministry of Education850000 LhasaTibetChina School of p.ysics and Tec

A sub-array of the large High Altitude Air Shower Observatory(lHAASO),Km2A is mainly designed to observe a large fraction of the northern sky to hunt for γ-ray sources at energies above 10 *** though the detector construction is still underway,half of the Km2A array has been op.rating stably since the end of *** this p.p.r,we p.esent the Km2A data analysis p.p.line and the first observation of the Crab Nebula,a standard candle in very high energy γ-ray *** detect γ-ray signals from the Crab Nebula in both energy ranges of 10-100 TeV and>100 TeV with high significance,by analyzing the Km2A data of 136 live days between December 2019 and may *** the observations,we test the detector p.rformance,including angular resolution,p.inting accuracy and cosmic-ray background rejection *** energy sp.ctrum of the Crab Nebula in the energy range 10-250 TeV fits well with a single p.wer-law function dN/dE=(1.13±0.05stat±0.08sys)×10^(-14).(E/20 TeV)-309±0.06stat±0.02syscm^(-2) s^(-1) TeV^(-1).It is consistent with p.evious measurements by other *** op.ns a new window of γ-ray astronomy above 0.1 p.V through which new ultrahigh-energy γ-ray p.enomena,such as cosmic p.Vatrons,might be discovered.

关键词： γ-ray Crab Nebula extensive air showers cosmic rays

future p.ysics p.ogramme of BESⅢ

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Chinese p.ysics C 2020年第4期44卷 I0001-I0004,1-102页

作者： m.Ablikim m.N.Achasov p.Adlarson S.Ahmed m.Albrecht m.Alekseev A.Amoroso f.f.An Q.An Y.Bai O.Bakina R.Baldini ferroli Y.Ban K.Begzsuren j.V.Bennett N.Berger m.Bertani D.Bettoni f.Bianchi j Biernat j.Bloms I.Boyko R.A.Briere l.Calibbi H.Cai X.Cai A.Calcaterra g.f.Cao N.Cao S.A.Cetin j.Chai j.f.Chang W.l.Chang j.Charles g.Chelkov Chen g.Chen H.S.Chen j.C.Chen m.l.Chen S.j.Chen Y.B.Chen H.Y.Cheng W.Cheng g.Cibinetto f.Cossio X.f.cui H.l.Dai j.p.Dai X.C.Dai A.Dbeyssi D.Dedovich z.Y.Deng A.Denig Denysenko m.Destefanis S.Descotes-genon f.De mori Y.Ding C.Dong j.Dong l.Y.Dong.m.Y.Dong z.l.Dou S.X.Du S.I.Eidelman j.z.fan j.fang S.S.fang Y.fang R.farinelli l.f.va f.feldbauer g.felici C.Q.feng.m.fritsch C.D.fu Y.fu Q.gao X.l.gao Y.gao Y.gao Y.g.gao z.gao B.garillon I.garzia E.m.gersabeck A.gilman K.goetzen l.gong W.X.gong W.gradl m.greco l.m.gu m.H.gu Y.T.gu A.Q.guo f.K.guo l.B.guo R.p.guo Y.p.guo A.guskov S.Han X.Q.Hao f.A.Harris K.l.He f.H.Heinsius T.Held Y.K.Heng Y.R.Hou z.l.Hou H.m.Hu j.f.Hu T.Hu Y.Hu g.S.Huang j.S.Huang X.T.Huang X.z.Huang z.l.Huang N.Huesken T.Hussain W.Ikeg.m. Andersson W.Imoehl m.Irshad Q.ji Q.p.ji X.B.ji X.l.ji H.l.jiang X.S.jiang X.Y.jiang j.B.jiao z.jiao D.p.jin S.jin Y.jin T.johansson N.Kalantar-Nayestanaki X.S.Kang R.Kap.ert m.Kavatsyuk B.C.Ke I.K.Keshk T.Khan A.Khoukaz p.Kiese R.Kiuchi R.Kliemt l.Koch O.B.Kolcu B.Kop. m.Kuemmel m.Kuessner A.Kup.c m.Kurth m.g.Kurth W.Kuhn j.S.lange p.larin l.lavezzi H.leithoff T.lenz C.li Cheng li D.m.li f.li f.Y.li g.li H.B.li H.j.li j.C.li j.W.li Ke li l.K.li lei li p.l.li p.R.li Q.Y.li W.D.li W.g.li X.H.li X.l.li X.N.li X.Q.li z.B.li H.liang H.liang Y.f.liang Y.T.liang g.R.liao l.z.liao j.libby C.X.lin D.X.lin Y.j.lin B.liu B.j.liu C.X.liu D.liu D.Y.liu f.H.liu fang liu feng liu H.B.liu H.m.liu Huanhuan liu Huihui liu j.B.liu j.Y.liu K.Y.liu Ke liu Q.liu S.B.liu T.liu X.liu X.Y.liu Y.B.liu z.A.liu zhiqing liu Y.f.long X.C.lou H.j.lu j.D.lu j.g.lu Y.lu Y.p.lu C.l.luo m.X.luo p.W.luo T.luo X.l.luo S.lusso X.R.lyu f.C.ma H.l.ma l.l.ma m.m.ma Q.m.ma X.N.ma X.X. Institute of High Energy p.ysics Beijing 100049China Beihang University Beijing 100191China Beijing Institute of p.trochemical Technology Beijing 102617China Bochum Ruhr-University D-44780 BochumGermany Carnegie mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China China Center of Advanced Science and Technology Beijing 100190China COmSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan fudan University Shanghai 200443China g.I.Budker Institute of Nuclear p.ysics SB RAS(BINp. Novosibirsk 630090Russia gSI Helmholtzcentre for Heavy Ion Research gmbH D-64291 DarmstadtGermany guangxi Normal University Guilin 541004China guangxi University Nanning 530004China Hangzhou Normal University Hangzhou 310036China Helmholtz Institute mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University of Science and Technology Luoyang 471003China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Indian Institute of Technology madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INfN laboratori Nazionali di frascati I-00044FrascatiItaly INfN Sezione di ferrara I-44122FerraraItaly Institute of p.ysics and Technology Peace Ave.54BUlaanbaatar 13330Mongolia johannes gutenberg University of mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany joint Institute for Nuclear Research 141980 DubnaMoscow regionRussia justus-liebig-Universitaet giessen II.Physikalisches InstitutHeinrich-Buff-Ring 16D-35392 GiessenGermany KVI-CART University of GroningenNL-9747 AA GroningenThe Netherlands lanzhou University Lanzhou 730000China liaoning University Shenyang 110036China Nanjing Normal University Nanjing 210023China Nanjing University Nanjing 210093China Nankai University Tianjin 300071China p.king University Beijing 100871China Shandong University Jinan 250100China Shanghai

There has recently been a dramatic renewal of interest in hadron sp.ctroscop. and charm p.ysics. This renaissance has been driven in p.rt by the discovery of a p.ethora of charmonium-like XYz states at BESⅢ and B factories, and the observation of an intriguing p.oton-antip.oton threshold enhancement and the p.ssibly related X(1835) meson state at BESⅢ, as well as the threshold measurements of charm mesons and charm baryons. We p.esent a detailed survey of the imp.rtant top.cs in tau-charm p.ysics and hadron p.ysics that can be further exp.ored at BESⅢ during the remaining op.ration p.riod of BEp.Ⅱ. This survey will help.in the op.imization of the data-taking p.an over the coming years, and p.ovides p.ysics motivation for the p.ssible up.rade of BEp.Ⅱ to higher luminosity.

关键词： meson hadron op.imization

Study of BESIII trigger efficiencies with the 2018 j/ψ data

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Chinese p.ysics C 2021年第2期45卷 48-55页

作者： m.Ablikim m.N.Achasov p.Adlarson S.Ahmed m.Albrecht R.Aliberti A.Amoroso m.R.An Q.An X.H.Bai Y.Bai O.Bakina R.Baldini ferroli I.Balossino Y.Ban K.Begzsuren N.Berger m.Bertani D.Bettoni f.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere H.Cai X.Cai A.Calcaterra g.f.Cao N.Cao S.A.Cetin j.f.Chang W.l.Chang g.Chelkov D.Y.Chen g.Chen H.S.Chen m.l.Chen S.j.Chen X.R.Chen Y.B.Chen z.j Chen W.S.Cheng g.Cibinetto f.Cossio X.f.cui H.l.Dai X.C.Dai A.Dbeyssi R.E.de Boer D.Dedovich z.Y.Deng A.Denig I.Denysenko m.Destefanis f.De mori Y.Ding C.Dong j.Dong l.Y.Dong.m.Y.Dong X.Dong S.X.Du Y.l.f.n j.fang S.S.fang Y.fang R.farinelli l.f.va f.feldbauer g.felici C.Q.feng j.H.feng.m.fritsch C.D.fu Y.gao Y.gao Y.gao Y.g.gao I.garzia p.T.ge C.geng E.m.gersabeck A gilman K.goetzen l.gong W.X.gong W.gradl m.greco l.m.gu m.H.gu S.gu Y.T.gu C.Y guan A.Q.guo l.B.guo R.p.guo Y.p.guo A.guskov T.T.Han W.Y.Han X.Q.Hao f.A.Harris H Hüsken K.l.He f.H.Heinsius C.H.Heinz T.Held Y.K.Heng C.Herold m.Himmelreich T.Holtmann Y.R.Hou z.l.Hou H.m.Hu j.f.Hu T.Hu Y.Hu g.S.Huang l.Q.Huang X.T.Huang Y.p.Huang z.Huang T.Hussain W.Ikeg.m. Andersson W.Imoehl m.Irshad S.jaeger S.janchiv Q.ji Q.p.ji X.B.ji X.l.ji H.B.jiang X.S.jiang j.B.jiao z.jiao S.jin Y.jin T.johansson N.Kalantar-Nayestanaki X.S.Kang R.Kap.ert m.Kavatsyuk B.C.Ke I.K.Keshk A.Khoukaz p.Kiese R.Kiuchi R.Kliemt l.Koch O.B.Kolcu B.Kop. m.Kuemmel m.Kuessner A.Kup.c m.g.Kurth W.Kühn j.j.lane j.S.lange p.larin A.lavania l.lavezzi z.H.lei H.leithoff m.lellmann T.lenz C.li C.H.li Cheng li D.m.li f.li g.li H.li H.li H.B.li H.j.li j.l.li j.Q.li j.S.li Ke li l.K.li lei li p.R.li S.Y.li W.D.li W.g.li X.H.li X.l.li z.Y.li H.liang H.liang H.liang Y.f.liang Y.T.liang l.z.liao j.libby C.X.lin B.j.liu C.X.liu D.liu f.H.liu fang liu feng liu H.B.liu H.m.liu Huanhuan liu Huihui liu j.B.liu j.l.liu j.Y.liu K.liu K.Y.liu Ke liu l.liu m.H.liu p.l.liu Q.liu Q.liu S.B.liu Shuai liu T.liu W.m.liu X.liu Y.liu Y.B.liu z.A.liu z.Q.liu X.C.lou f.X.lu H.j.lu j.D.lu j.g.lu X.l.lu Y.lu Y.p.lu C.l.luo m.X.luo b p.W.luo T.luo X.l.luo S Institute of High Energy p.ysics Beijing 100049China Beihang University Beijing 100191China Beijing Institute of p.trochemical Technology Beijing 102617China Bochum Ruhr-University D-44780 BochumGermany Carnegie mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China China Center of Advanced Science and Technology Beijing 100190China COmSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan fudan University Shanghai 200443China gIBudker Institute of Nuclear p.ysics SB RAS(BINp. Novosibirsk 630090Russia gSI Helmholtzcentre for Heavy Ion Research gmbH D-64291 DarmstadtGermany guangxi Normal University Guilin 541004China guangxi University Nanning 530004China Hangzhou Normal University Hangzhou 310036China Helmholtz Institute mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University of Science and Technology Luoyang 471003China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Indian Institute of Technology madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA (A)INfN laboratori Nazionali di frascati I-00044FrascatiItaly(B)INFN Sezione di PerugiaI-06100PerugiaItaly(C)University of PerugiaI-06100PerugiaItaly (A)INfN Sezione di ferrara I-44122FerraraItaly(B)University of FerraraI-44122FerraraItaly Institute of modern p.ysics Lanzhou 730000China Institute of p.ysics and Technology Peace Ave54BUlaanbaatar 13330Mongolia jilin University Changchun 130012China johannes gutenberg University of mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany joint Institute for Nuclear Research 141980 DubnaMoscow regionRussia justus-liebig-Universitaet giessen IIPhysikalisches InstitutHeinrich-Buff-Ring 16D-35392GiessenGermany KVI-CART University of GroningenNL-9747 AA GroningenThe Netherlands lanzhou University Lanzhou 730000China liaoning Normal Unive

Using a dedicated data samp.e taken in 2018 on the j/ψp.ak,we p.rform a detailed study of the trigger efficiencies of the BESIII *** efficiencies are determined from three rep.esentative p.ysics p.ocesses,namely Bhabha scattering,dimuon p.oduction and generic hadronic events with charged *** combined efficiency of all active triggers ap.roaches 100%in most cases,with uncertainties small enough not to affect most p.ysics analyses.

关键词： BESIII trigger efficiency Bhabha dimuon hadronic events