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Synthesis and luminescence properties of blue-emitting phosphor Ba3LaK(PO4)3F:Eu2+ for n-UV white-light-emitting diodes

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Synthesis and luminescence properties of blue-emitting phosp...

The design and performance of charged particle detector onboard the GECAM mission

第二届海峡两岸功能材料科技与产业峰会（2015）

作者： X.X.Ma y.q.liu H.K.liu L.F.Mei L.B.Liao School of Materials Sciences and Technology China University of Geosciences

A series of blue-emitting phosphors BaLaK(PO)F:x Eu(BLKPF:x Eu)were synthesized based on the conventional high-temperature solid-state *** photoluminescence(PL)and diffuse reflection spectra had been investigated *** phosphor exhibited strong broad absorption band in the near ultraviolet(n-UV)range from 200 to 450 nm,and generated bright blue emission centered at 460 nm upon 388 nm excitation *** critical Eu quenching concentration(qC)mechanism was ascribed to

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Radiation Detection Technology and Methods 2022年第1期6卷 53-62页

作者： y.B.Xu X.q.Li X.L.Sun S.yang H.Wang W.X.Peng X.H.Liang K.Gong y.q.liu D.y.Guo X.y.Zhao C.y.Li Z.H.An J.J.He X.J.liu X.y.Wen S.L.Xiong Fan Zhang D.L.Zhang C.y.Zhang C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao D.J.Hou y.G.Li G.Li L.Li X.F.Li M.S.Li F.J.Lu H.Lu B.Meng F.Shi J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao y.P.Xu J.W.yang q.B.yi S.N.Zhang C.M.Zhang F.Zhang y.Zhao X.Zhou Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Background The Gravitational wave highly energetic Electromagnetic Counterpart All-sky Monitor(GECAM)is dedicated to detecting gravitational wave gamma-ray *** is capable of all-sky monitoring over and discovering gamma-ray bursts and new radiation *** consists of two microsatellites,each equipped with 8 charged particle detectors(CPDs)and 25 gamma-ray detectors(GRDs).Purpose The CPD is used to measure charged particles in the space environment,monitor energy and flow intensity changes,and identify between gamma-ray bursts and space charged particle events in conjunction with *** CPD uses plastic scintillator as the sensitive material for detection,silicon photomultiplier array as the optically readable device,and the inlaid Am-241 radioactive source as the onboard calibration *** In this paper,we will present the working principle,physical design,functional implementation and preliminary performance test results of the *** a result,the energy range of electron,gamma-ray detection efficiency and dead time are tested to be better than the indexes required through the ground calibration experiment.

关键词： GECAM CPD SiPM

The data acquisition algorithm designed for the SiPM-based detectors of GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 70-77页

作者： y.q.liu K.Gong X.q.Li X.y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.liu F.J.Lu H.Lu B.Meng W.X.Peng F.Shi X.L.Sun H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.B.Xu y.P.Xu S.yang J.W.yang q.B.yi Fan Zhang D.L.Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao y.Zhao X.Zhou 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 Physics and Space Science College China West Normal UniversityNanchong 637002China

Background The Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor(GECAM)consists of 2 microsatellites,each of which contains 25 GRD(LaBr3)detectors and 8 CPD(plastic scintillator)*** silicon photomultiplier(SiPM)array is used to read each *** output signal of these detectors with SiPM array is very special and challenging to *** this study,a novel data acquisition(DAq)algorithm for these detectors is designed and implemented,and the content of the output event packet is *** and Conclusion The performances,including the event acquisition efficiency of this DAq algorithm,are extensively verified through experimental *** the on-ground and in-flight tests,this algorithm has excellent performance despite the very limited resources and short development time of GECAM mission.

关键词： Silicon photomultiplier Digital waveform processing Data acquisition

The design and performance of GRD onboard the GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 43-52页

作者： Z.H.An X.L.Sun D.L.Zhang S.yang X.q.Li X.y.Wen K.Gong X.H.Liang X.J.liu y.q.liu y.G.Li S.L.Xiong y.B.Xu Fan Zhang X.y.Zhao C.Cai Z.Chang G.Chen C.Chen y.y.Du P.y.Feng M.Gao R.Gao D.y.Guo J.J.He D.J.Hou C.y.Li G.Li L.Li X.F.Li M.S.Li F.J.Lu H.Lu B.Meng W.X.Peng F.Shi H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao y.P.Xu J.W.yang q.B.yi S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang y.Zhao X.Zhou CAS Institute of High Energy PhysicsBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China 3 Xiangtan UniversityXiangtan 411105China 4 Beijing Normal UniversityBeijing 110875China Xiangtan University Xiangtan 411105China Beijing Normal University Beijing 110875China

Background Each GECAM satellite payload contains 25 gamma-ray detectors(GRDs),which can detect gamma-rays and particles and can roughly localize the Gamma-Ray Bursts(GRBs).GRD was designed using lanthanum bromide(LaBr3)crystal as the sensitive material with the rear end coupled with silicon photomultiplier(SiPM)array for *** In aerospace engineering design of GRD,there are many key points to be *** this paper,we present the specific design scheme of GRD,the assembly and the performance test results of *** Based on Monte Carlo simulation and experimental test results,the specific schematic design and assembling process of GRD were *** being fully assembled,the GRDs were conducted performance tests by using radioactive source and also conducted random vibration *** and conclusion The test results show that all satellite-borne GRDs have energy resolutionquirements of satellite in scientific *** random vibration test shows that GRD can maintain in a stable performance,which meets the requirement of spatial application.

关键词： Lanthanum bromide scintillator SiPM array GECAM Gamma-ray detector Energy resolution

Acceleration of 60 MeV proton beams in the commissioning experiment of the SULF-10 PW laser

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High Power Laser Science and Engineering 2022年第4期10卷 36-44页

作者： A.X.Li C.y.qin H.Zhang S.Li L.L.Fan q.S.Wang T.J.Xu N.W.Wang L.H.yu y.Xu y.q.liu C.Wang X.L.Wang Z.X.Zhang X.y.liu P.L.Bai Z.B.Gan X.B.Zhang X.B.Wang C.Fan y.J.Sun y.H.Tang B.yao X.y.Liang y.X.Leng B.F.Shen L.L.Ji R.X.Li Z.Z.Xu State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Shanghai Tech University Shanghai 201210China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBejing 100049China CAS Centerfor Excellence inUltra-intense Laser Science Shanghai 201800China College of Science University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics Shanghai Normal UniversityShanghai 200234China

We report the experimental results of the commissioning phase in the 10 PW laser beamline of the Shanghai Superintense Ultrafast Laser Facility(SULF).The peak power reaches 2.4 PW on target without the last amplifying during the *** laser energy of 72±9 J is directed to a focal spot of approximately 6μm diameter(full width at half maximum)in 30 fs pulse duration,yielding a focused peak intensity around 2.0×10^(21)W/cm^(2).The first laser-proton acceleration experiment is performed using plain copper and plastic ***-energy proton beams with maximum cut-off energy up to 62.5 MeV are achieved using copper foils at the optimum target thickness of 4μm via target normal sheath *** plastic targets of tens of nanometers thick,the proton cut-off energy is approximately 20 MeV,showing ring-like or flamented density *** experimental results reflect the capabilities of the SULF-10 PW beamline,for example,both ultrahigh intensity and relatively good beam *** optimization for these key parameters is underway,where peak laser intensities of 10^(22)-10^(23)w/cm^(2)are anticipated to support various experiments on extreme field physics.

关键词： high-energy proton source laser-plasma interaction ultraintense lasers

quality assurance test and failure analysis of SiPM arrays of GECAM satellites

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Radiation Detection Technology and Methods 2022年第1期6卷 35-42页

作者： D.L.Zhang M.Gao X.L.Sun X.q.Li Z.H.An X.y.Wen C.Cai Z.Chang G.Chen C.Chen y.y.Du R.Gao K.Gong D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.liu y.q.liu F.J.Lu H.Lu B.Meng W.X.Peng F.Shi H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.B.Xu y.P.Xu S.yang J.W.yang Fan.Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao X.Zhou Institute of High Energy Physics CASBeijing 100049People’s Republic of China

Background The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)satellite developed a SiPM-based gamma-ray detector to monitor the gravitational wave-related GRBs and guide subsequent observations in other wavelengths of *** As all the available SiPM devices belong to commercial grade,quality assurance tests need to be performed in accordance with the aerospace *** In the SiPM application of GECAM,quality assurance experiments were *** mechanism of the failure of SiPM devices was analyzed during the development *** Based on the quality assurance test results,the fnal pass rate of SiPM array was 95%.Based on the failure analysis,it was found that a piece of SiPM had a leakage channel after longtime operation due to device *** According to the accumulated experience,in the reliability test of SiPM,it is necessary to pay special attention to test the impedance of each pin of SiPM to ground and confrm that the power switch state of SiPM is controllable.

关键词： Gravitational waves Gamma-ray detectors Silicon photomultipliers quality assurance test Failure analysis

Dedicated SiPM array for GRD of GECAM

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Radiation Detection Technology and Methods 2022年第1期6卷 63-69页

作者： D.L.Zhang X.L.Sun Z.H.An X.q.Li X.y.Wen K.Gong C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.liu y.q.liu F.J.Lu H.Lu B.Meng W.X.Peng F.Shi H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.B.Xu y.P.Xu S.yang1 X.Zhou J.W.yang Fan Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao Institute of High Energy Physics CASBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China

Purpose The discovery of gravitational waves and gamma-ray bursts heralds the era of multi-messenger *** the adoption of two small satellites to achieve the all-sky monitoring of gamma-ray bursts,the gravitational wave highenergy electromagnetic counterpart all-sky monitor(GECAM)possesses a quasi-real-time early warning ability and plays an important role in positioning the sources of gravitational waves and in subsequent *** satellite of GECAM was fitted with 253-inch-diameter gamma-ray detectors(GRD),covering an energy range of 8–2 *** have adopted silicon photomultiplier tubes(SiPM)in lieu of photomultiplier tubes(PMT)to adapt to the dimensional limitations of *** A unique 3-inch circular SiPM array was *** this design,646×6 mm chips were arranged evenly in a circular manner with the seams filled with reflecting films,thus achieving satisfactory uniformity of light *** integrated pre-amplifier circuit on the back of the SiPM array adopted two-level grouping and summing;further,it achieved a satisfactory signal-to-noise *** high-gain and low-gain channels were adopted to achieve a large dynamic range,and two independent power supply units were used,where each unit can be closed separately,thus improving *** Performance studies show that this SiPM array meets the requirements of *** A 3-inch SiPM array have been developed that uses grouped summation,reflective films,a circular arrangement,two groups of independent power supplies,high-and low-gain signals,differential signal output technologies,*** solution can be used not only for GECAM,but also as a general solution for SiPM-based scintillation detectors.

关键词： SiPM GECAM Gamma-ray Signal-to-noise ratio Reflecting film Pre-amplifier

The technology for detection of gamma-ray burst with GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 12-25页

作者： X.q.Li X.y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao K.Gong D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.liu y.q.liu F.J.Lu H.Lu B.Meng W.X.Peng F.Shi X.L.Sun H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.B.Xu y.P.Xu S.yang J.W.yang q.B.yi D.L.Zhang Fan Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao y.Zhao X.Zhou C.S.Zhang J.P.yu L.Chang K.K.Zhang J.Huang y.M.Chen X.B.Han Institute of High Energy Physics CASBeijing 100049China Xiangtan University Xiangtan 411105China Beijing Normal University Beijing 110875China Beijing Glass Research Institute Beijing 101100China Innovation Academy for Microsatellites of CAS Shanghai 201204China

Introduction The main physical objective of the GECAM satellite is to detect gamma-ray bursts,which is related to gravitational waves of double compact object *** GECAM satellite also detects and investigates various bursts of high-energy celestial *** and methods In this study,we designed,developed and calibrated the payload and launched it into orbit with GECAM *** payload consists of the gamma ray detector(GRD,for detecting 4 keV–4 MeV X/γray),the charged particle detector(CPD,for detecting 150 keV–5 MeV charged particle),and the electronic box(EBOX).The all-sky field coverage is achieved via two 229-degree large-area satellites positioned 180 degrees apart and are on opposite sides of the *** satellite is equipped with 25 GRDs and 8 CPDs;thus,the satellite can identify charged particle bursts in ***-ray detectors adopt lanthanum bromide crystal technology combined with silicon *** is the first time that this technology was used massively in space *** The GECAM satellite can quickly determine the direction of gamma-ray bursts(positioning)via indexing and fitting method,while the transmit variability,energy spectrum and direction of the gamma-ray bursts guide subsequent observations through the Beidou-3 RDSS in quasi-real *** will play an important role in the study of high energy celestial bursts.

关键词： GECAM Gamma-ray burst Lanthanum bromide crystal Silicon photomultiplier Beidou short message

COUPLED SIMULATION OF 3D ELECTRO-MAGNETO-FLOW FIELD IN HALL-HEROULT CELLS USING FINITE ELEMENT METHOD

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Acta Metallurgica Sinica(English Letters) 2006年第2期19卷 105-116页

作者： J. Li W. liu y.q. Lai q.y. Li y.X. liu School of Metallurgy Science and Engineering Central South University Changsha 410083 China Chemistry Department Guangxi Normal University Guilin 531400 China

Two full 3D steady mathematical models are developed by finite element method （FEM） to calcalate coupled physics fields. the electro-magnetic model is built and solved first and so is the fluid motion model with the acquired electromagnetic force as source body forces in Navier-Stokes equations. Effects caused by the ferromagnetic shell, busbar system around, and open boundary problem as well as inside induced current were considered in terms of the magnetic field. Furthermore, a new modeling method is found to set up solid models and then mesh them entirely with so-called structuralized grids, namely hex-mesh. Examples of 75kA prebaked cell with two kinds of busbar arrangements are presented. Results agree with those disclosed in the literature and confirm that the coupled simulation is valid. It is also concluded that the usage of these models facilitates the consistent analysis of the electric field to magnetic field and then flow motion to the greater extent, local distributions of current density and magnetic flux density are very much dependent on the cell structure, the steel shell is a shield to reduce the magnetic field and flow pattern is two dimensional in the main body of the metal pad.

关键词： coupled simulation electromagnetic field flow field aluminum reduction cell finite element analysis