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Applications of 20-inch photomultiplier tubes in neutrino and cosmic ray experiments 认领 引用
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作者 Feng Gao Sen Qian +1 位作者 Andrei Sidorenkov Bayarto Lubsandorzhiev 《The Innovation》 EI 2026年第3期11-12,共2页
The development of the 20-inch photomultiplier tube(PMT)began in the late 1970s,motivated by the extreme demand for a large photon collection area in large-scale particle physics detectors.To maximize detection of wea... The development of the 20-inch photomultiplier tube(PMT)began in the late 1970s,motivated by the extreme demand for a large photon collection area in large-scale particle physics detectors.To maximize detection of weak Cherenkov radiation,Masatoshi Koshiba from ICRR,Tokyo,Japan,proposed an ambitious concept for a photodetector with an aperture far larger than any existing design at the time. 展开更多
关键词 Cherenkov radiation neutrino experiments particle physics inch photomultiplier tubes photomultiplier tubes cosmic ray experiments detection weak cherenkov radiationmasatoshi photodetector
Longitudinal combustion instability in a hypergolic liquid bipropellant combustor with single dual-swirl coaxial injector 认领 引用 被引量：1
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作者 Wei CHU Kangkang GUO +3 位作者 Yiheng TONG Yongjie REN Boqi XU Wansheng NIE 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第3期280-291,共12页
Self-excited longitudinal combustion instabilities were investigated in a hypergolic liquid bipropellant combustor, which applied single dual-swirl coaxial injector. Hot-fire tests were conducted for four different in... Self-excited longitudinal combustion instabilities were investigated in a hypergolic liquid bipropellant combustor, which applied single dual-swirl coaxial injector. Hot-fire tests were conducted for four different injector geometries, while extensive tests on injection conditions were carried out for each injector geometry. The synchronous measurement of the pressure and heat release rate was applied, successfully capturing the process of the pressure and heat release rate enhanced coupling and developing into in-phase oscillation. By calculating Rayleigh index at the head and middle section of the chamber, it is shown that Rayleigh index of the middle section is even higher than that of the head, indicating a long heat release zone. When the combustion instability occurs, the pressure in propellant manifolds also oscillates with the same frequency and lags behind the oscillation in the combustor. Compared to the oscillation in the outer injector manifold, the oscillation in the inner injector manifold shows a higher correlation with that in the chamber in amplitude and phase. Based on numerical simulations of the multiphase cold flow inside the injector and combustion process in the chamber, it is found that injector geometries affect longitudinal combustion instability by changing spray cone angle. The spray with small cone angle is more sensitive to the modulation of longitudinal pressure wave in combustion simulations, which is more likely to excite the longitudinal combustion instability. Meanwhile, the combustion instability may be related to the pulsating coherent structure generated by the spray fluctuation, which is determined by injection conditions. Besides, a positive feedback closed-loop system associated with the active fluctuation and passive oscillation of the spray is believed to excite and sustain the longitudinal combustion instability. 展开更多
关键词 Longitudinal combustion instability Dual-swirl coaxial injector Unsymmetrical Dimethylhydrazine/Nitrogen Tetroxide(UDMH/NTO) Photomultiplier Tubes(PMT) Spray fluctuation Pressure wave Modulation
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Database system for managing 20,00020-inch PMTs at JUNO 认领 引用 被引量：3
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作者 Jun Wang Nikolay Anfimov +16 位作者 Jing-Yuan Guo Yu Gu Hang Hu Min Li Qiu-Mei Ma Alexander Olshevskiy Zhao-Yuan Peng Zhong-Hua Qin Alexander Tietzsch Bjorn Wonsak Wei Wang Zhi-Min Wang Mei-Hang Xu Wan Xie Zheng-Yun You Hai-Qiong Zhang Rong Zhao 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第3期10-21,共12页
A database system,known as the large PMT characterization and instrumentation database system(LPMT-CIDS),was designed and implemented for the Jiangmen Underground Neutrino Observatory(JUNO).The system is based on a Li... A database system,known as the large PMT characterization and instrumentation database system(LPMT-CIDS),was designed and implemented for the Jiangmen Underground Neutrino Observatory(JUNO).The system is based on a Linux+Apache+MySQL+PHP(LAMP)server and focuses on modularization and architecture separation.It covers all the testing stages for the 20-inch photomultiplier tubes(PMTs)at JUNO and provides its users with data storage,analysis,and visualization services.Based on the successful use of the system in the 20-inch PMT testing program,its design approach and construction elements can be extended to other projects. 展开更多
关键词 LAMP Photomultiplier tubes Jiangmen underground neutrino observatory Data visualization
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Analysis of relative error in detection caused by signal-induced noise in Na lidar system 认领 引用 被引量：4
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作者 ZHANG YunPeng YI Fan KONG Wei 《Science China Earth Sciences》 SCIE EI CAS CSCD 2018年第1期109-118,共10页
Signal-induced noise(SIN) in a photomultiplier tube(PMT) introduces bias into the Na density results that are retrieved from the backscattered signals of Na resonance fluorescence lidar systems. The response character... Signal-induced noise(SIN) in a photomultiplier tube(PMT) introduces bias into the Na density results that are retrieved from the backscattered signals of Na resonance fluorescence lidar systems. The response characteristics of a PMT when stimulated by a series of light pulses with a fixed width of 1 μs are therefore used to develop a precise SIN model to estimate the relative error caused by SIN. Unless the strong signals that are returned from the lower atmosphere are excluded, the measured density results are always smaller than the actual values, and the resulting relative error may be 50% or more. Three potential solutions to reduce the SIN were quantified for comparison, including use of a chopper system, use of a gated circuit, and separation of the laser beam and the telescope receiver. When optimized parameters are used for these technologies, the relative error can then be reduced to less than 2%. 展开更多
关键词 Lidar Signal-induced noise Photomultiplier tube
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A plastic scintillating fiber position detector in vacuum for the test beam facility at BEPCⅡ-LINAC 认领 引用
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作者 柯尊建 李家才 +3 位作者 张少平 安广朋 唐兴华 杨涛 《Chinese Physics C》 SCIE CAS CSCD 2012年第1期67-70,共4页
Two plastic scintillating fiber position detectors for charged particles have been designed,built and installed inside the vacuum tube near two sides of the DM2 deflection magnet on the E3 beam line of the test beam f... Two plastic scintillating fiber position detectors for charged particles have been designed,built and installed inside the vacuum tube near two sides of the DM2 deflection magnet on the E3 beam line of the test beam facility at the BEPC-LINAC.A one-dimensional position resolution of～1 mm with a sensitive area of 60 mm×60 mm has been obtained for this detector. 展开更多
关键词 plastic scintillating fiber multi-anode photomultiplier tube vacuum
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Effect of annealing atmospheres on the scintillation properties of Ce3+‑doped YAG nanoscintillator 认领 引用
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作者 Billel Zahra Lakhdar Guerbous +1 位作者 Hicham Bousbia‑salah Allaoua Boukerika 《Radiation Detection Technology and Methods》 CSCD 2023年第3期447-456,共10页
Background In this study,three sample detectors have been prepared by using cerium-activated YAG nanoscintillator(Y3Al5O12:Ce3+)synthesized by sol-gel method and heat-treat at 900°C for 2 h in differe... Background In this study,three sample detectors have been prepared by using cerium-activated YAG nanoscintillator(Y3Al5O12:Ce3+)synthesized by sol-gel method and heat-treat at 900°C for 2 h in different atmospheres such as vacuum,air and nitrogen.Purpose Many studies about YAG:Ce3+single crystal have been carried out,but the material at the nanoscale remains not enough understood.The objective of the present paper is to investigate the effects of annealing atmosphere on the scintillation properties and identify the suitable atmosphere that allow to design radiation detectors with high scintillation efficiency.Methods In order to accurately assess the scintillation properties,the nanoscintillator sample powders have been designed as a detector,in which,preparation operations such as surface homogenization and efficiency coupling with photomultiplier tube(PMT)window were developed.The study was performed usingγ-rays 662 keV released from137Cs radioactive source,the bi-alkali GDB-4FF PMT was used as a photodetector.Nuclear instrumentation chain was set up in order to collect the pulse height spectra,NaI:Tl single-crystal scintillator was used as a reference detector to estimate the scintillation light yield.The delayed coincidence method was used for measuring the scintillation decay time of nanoscintillator sample detectors.Results The sample detector annealed at vacuum atmosphere exhibits the best scintillation properties,the scintillation light yield was estimated to be 14,600±3400 ph/MeV and the fast component in the scintillation decay was 90 ns.Conclusion The vacuum is the suitable atmosphere which allows the development of radiation detectors with high scintillation efficiency. 展开更多
关键词 Nanoscintillator YAG:Ce3+ Scintillation properties γ-rays 662 keV Photomultiplier tube Sample detectors Annealing atmosphere
Magnetic shielding for DAMPE electromagnetic calorimeter PMTs 认领 引用
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作者 王培龙 张云龙 +1 位作者 汪晓莲 许咨宗 《Chinese Physics C》 SCIE EI CAS CSCD 2014年第8期53-56,共4页
The magnetic characteristics of R5610A-01 photomultiplier tubes are studied in this paper. The experimental data shows that the gain of R5610A-01 loses about 53% when the magnetic field is 3 Gs along its ＋X axis. A c... The magnetic characteristics of R5610A-01 photomultiplier tubes are studied in this paper. The experimental data shows that the gain of R5610A-01 loses about 53% when the magnetic field is 3 Gs along its ＋X axis. A cylinder of one-layer permalloy strip is able to reduce the effect of a 3 Gs magnetic field on the PMT gain to less than 1%. 展开更多
关键词 photomultiplier tube magnetic shield characteristics
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