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| 1 | Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment显示文摘A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and ^(70)Ge depleted germanium detectors. The production rates of long-lived radionuclides were calculated with Geant4 and CRY.Results were validated by comparing the simulated and experimental spectra of CDEX-1B detector. Based on the validated codes, the cosmogenic background level was predicted for further tonne-scale CDEX experiment. The suppression of cosmogenic background level could be achieved by underground germanium crystal growth and high-purity germanium detector fabrication to reach the sensitivity requirement for direct detection of dark matter. With the low cosmogenic background, new physics channels,such as solar neutrino research and neutrinoless double-beta decay experiments, were opened and the corresponding simulations and evaluations were carried out. | JingLu Ma Qian Yue ShinTed Lin Henry Tsz-King Wong JinWei Hu LiPing Jia Hao Jiang Jin Li ShuKui Liu ZhongZhi Liu Hao Ma WeiYou Tang Yang Tian Li Wang Qing Wang Yi Wang LiTao Yang Zhi Zeng | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，1： | 5 |
| 2 | Calibration of CR-39 solid-state track detectors for study of laser-driven nuclear reactions显示文摘It is of particular interest to investigate nuclear fusion reactions generated by high-intensity lasers in plasma environments that are similar to real astrophysical conditions.We have experimentally investigated2H(d,p)3H,one of the most crucial reactions in big bang nucleosynthesis models,at the Shenguang-Ⅱlaser facility.In this work,we present a new calibration of CR-39 solidstate track detectors,which are widely employed as the main diagnostics in this type of fusion reaction experiment.We measure the dependence of the track diameter on the proton energy.It is found that the track diameters of protons with different energies are likely to be identical.We propose that in this case,the energy of the reaction products can be obtained by considering both the diameters and gray levels of these tracks.The present results would be very helpful for analyzing the2 H(d,p)3H reaction products recorded with the same batch of CR-39 solid-state track detectors. | Yang-Fan He Xiao-Feng Xi Shi-Lun Guo Bing Guo Chuang-Ye He Fu-Long Liu Di Wu Ji-Hong Wei Wan-Sha Yang Luo-Huan Wang Dong-Hai Zhang Meng-Lin Qiu Guang-Fu Wang Chao-Yang Li Xiao-Fei Lan | 2020 | Nuclear Science and Techniques2020，31，4： | 2 |
| 3 | Research on performances of back-illuminated scientific CMOS for astronomical observations显示文摘To evaluate performances of a back-illuminated scientific CMOS(sCMOS)camera for astronomical observations,comparison tests between Andor Marana s CMOS and Andor iKon-L 936 CCD cameras were conducted in a laboratory and on a telescope.The laboratory tests showed that the readout noise of the sCMOS camera is about half lower,the dark current is about 17 times higher,the dynamic range is lower in the 12-bit setting and higher in the 16-bit setting,and the linearity and bias stability are comparable relative to those of the CCD camera.In field tests,we observed the open cluster M67 with the sCMOS and CCD cameras on a 60 cm telescope.Unlike the CCD camera,the sCMOS camera has a dual-amplifier architecture.Since a 16-bit image of the sCMOS camera is composed of two 12-bit images sampled with 12-bit high gain and low gain amplifiers simultaneously,it is not real 16-bit output data.The evaluation tests indicated that the dual-amplifier architecture of the s CMOS camera leads to a decline of photometric stability by about six times around specific pixel counts.For photometry of bright objects with similar magnitudes that require high frame rates,the s CMOS camera under 12-bit setting is a good choice.Therefore,the sCMOS camera is fitted with survey observations of variable objects requiring short exposure times,mostly less than 1 s,and high frame rates.It also satisfies the requirements for an offset guiding instrument owing to its high sensitivity,high temporal resolution and high stability. | Peng Qiu Yong Zhao Jie Zheng Jian-Feng Wang Xiao-Jun Jiang | 2021 | Research in Astronomy and Astrophysics2021，21，10： | 2 |
| 4 | Review of improved spectral response of ultraviolet photodetectors by surface plasmon显示文摘Ultraviolet(UV) photodetectors based on wide band gap semiconductor have attracted much attention for their small volume, low working voltage, long lifetime, good chemical and thermal stability. Up to now, many researches have been done on the semiconductors based UV detectors and some kinds of detectors have been made, such as metal–semiconductor–metal(MSM), Schottky, and PIN-type detectors. However, the sensitivity values of those detectors are still far from the expectation. Recent years, surface plasmon(SP) has been considered to be an effective way to enhance the sensitivity of semiconductor based UV photodetector. When the light is matched with the resonance frequency of surface plasmon, the localized field enhancement or scattering effect will happen and thus the spectral response will be enhanced.Here, we present an overview of surface plasmon enhancing the performance of UV detectors, including the GaN, ZnO,and other wide band gap semiconductor UV detectors. Both fundamental and experimental achievements are contained in this review. | 吴忧 孙晓娟 贾玉萍 黎大兵 | 2018 | Chinese Physics B2018，27，12： | 2 |
| 5 | Superconducting nanowire multi-photon detectors enabled by current reservoirs显示文摘Single-photon detectors are ubiquitous devices in quantum-photonic-based communication,computation,metrology,and sensing.In these applications,N-fold coincidence photon counting is often needed,for example,to characterize entanglement.However,N-fold coincidence photon counting typically requires N individual singlephoton detectors and associated bias and readout electronics,and these resources could become prohibitive if N goes large and the detectors need to work at cryogenic temperatures.Here,to break this limit on N,we propose a device architecture based on N cascaded photosensitive superconducting nanowires and one wider nanowire that functions as a current reservoir.We show that by strategically designing the device,the network of these superconducting nanowires can work in a synergic manner as an n-photon detector,where n can be from 1 to N,depending on the bias conditions.We therefore name the devices of this type superconducting nanowire multi-photon detectors(SNMPDs).In addition to its simple one-port bias and readout circuitry,the coincidences are counted internally in the detector,eliminating the need for external multi-channel,time-correlated pulse counters.We believe that the SNMPDs proposed in this work could open avenues towards conveniently measuring high-order temporal correlations of light and characterizing multi-photon entanglement. | KAI ZOU YUN MENG ZHAO WANG XIAOLONG HU | 2020 | Photonics Research2020，8，4： | 1 |
| 6 | Effects of high-energy proton irradiation on separate absorption and multiplication GaN avalanche photodiode显示文摘The effect of high-energy proton irradiation on GaN-based ultraviolet avalanche photodiodes(APDs) is investigated. The dark current of the GaN APD is calculated as a function of the proton energy and proton fluences. By considering the diffusion, generation–recombination, local hopping conductivity, band-to-band tunneling, and trap-assisted tunneling currents, we found that the dark current increases as the proton fluence increases, but decreases with increasing proton energy. | Gui-Peng Liu Xin Wang Meng-Nan Li Zheng-Peng Pang Yong-Hui Tian Jian-Hong Yang | 2018 | Nuclear Science and Techniques2018，29，10： | 1 |
| 7 | 5-23 Progress on the Silicon Semiconductor Detectors显示文摘With the complication and delicateness of the nuclear physics experiments, the traditional silicon semiconductor detectors such as silicon surface barrier detector and the Li-drifted detector, cannot satisfy the experimental requirements.Large area ion-implanted silicon detector and silicon strip detector have been badly needed and frequently used in the experiments. | Li Zhankui Li Haixia Li Ronghua Chen Cuihong Zu Kailing Li Chunyan Wang Xiuhua | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 8 | A Waveguide Gate-Type Complex Detecting Mechanism on Micro-Channel Plate Substrate显示文摘The waveguide gate-type mechanism on micro-channel plate substrate was firstly put forward for the complex photo detection in Free space optical communication(FSO). Based on the losses of energy coupling between both Micro-channel plates(MCP), we further proposed waveguide gate-type complex detecting mechanism, which was verified in electron optic system by vacuum testing. With the application of the complex detecting mechanism, the device performance has greatly improved, including higher space optical transfer and wider dynamic detecting range. | MU Yining FAN Haibo LIU Chunyang LIU Guozhen | 2019 | Chinese Journal of Electronics2019，28，3： | 0 |
| 9 | 新形势下高校教材编辑的职责──访美归来的反思显示文摘新形势下高校教材编辑的职责──访美归来的反思刘援从1993年底开始,我作为访问学者在美国进行了半年的学习考察。在美期间,自然对这个自由市场经济国度里的教材编辑出版分外关注。考察中不但受到了许多新的启发,而且还发现自己曾撰文论证的关于编辑责任的不少观点... | 刘援 | 1995 | 现代出版1995，，3： | 0 |
| 10 | A New Fiber Detection Method for LAMOST Based on the Front-illuminated Method显示文摘The double revolving fiber positioning technology is one of the key technologies for the success of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST).The accuracy of fiber positioning will directly affect the observation efficiency of LAMOST.To achieve higher fiber positioning accuracy,the original open-loop controlled fiber positioning system urgently needs to be upgraded into a closed-loop control system.The fiber detection is the most important part of the closed-loop controlled fiber positioning system.The back-illuminated detection method is usually used to detect the fiber position by directly detecting the light spot generated at the fiber end in the multi-fiber spectral surveys.In this paper,we introduce a new method to measure the fiber position based on the image of the front-illuminated LAMOST focal plane.The front-illuminated image does not require lighting devices inside the spectrograph,and it could reduce the instability and light pollution in the spectrograph end.Our method measures the fiber position by fitting the profile of the fiber pinhole with a 2D Gaussian function.A series of tests show that the relative position measurement precision of the front-illuminated method is about 012,and the method could have the same accuracy as the back-illuminated method once the system bias is calibrated by a simple radial correction function.The required fiber positioning accuracy of LAMOST is 04,and the new method satisfies the requirement of LAMOST fiber detection accuracy and could be used in the closed-loop fiber control system. | Ming Zhou Yong Zhang Guanru Lv Jian Li Zengxiang Zhou Zhigang Liu Jianping Wang Zhongrui Bai Yuan Tian Mengxin Wang Shuqing Wang Hongzhuan Hu Chao Zhai Jiaru Chu Zhijie Han Mingxu Liu Yiqiao Dong Hailong Yuan Yongheng Zhao Yaoquan Chu Haotong Zhang | 2022 | Research in Astronomy and Astrophysics2022，22，6： | 0 |
| 11 | SOFTWARE SERVO COURSE(ATTITUDE) SYSTEMS显示文摘SOFTWARESERVOCOURSE(ATTITUDE)SYSTEMSZhangXuefu(HunanRadioandTVUniversity,Changsha,Hunan,China,410004)SOFTWARESERVOCOURSE(ATTI... | Zhang Xuefu(Hunan Radio and TV University, Changsha, Hunan, China, 410004) | 1995 | Chinese Journal of Aeronautics1995，8，4： | 0 |
| 12 | HREM study on stacking structure of SiGe/Si infrared detector显示文摘Stacking structure and defects in SiGe/P Si infrared detector were studied by using localization high resolution electron microscopy (HREM). The photosensitive region in the detector consists of 3 P + Si 0.65 Ge 0.35 layers and 2 UD Si (undoped Si) layers. The interface between Si 0.65 Ge 0.35 and UD Si is not sharp and has a transition zone with non uniform contrast. The misfit stress of interface is distributed gradiently along the normal direction of the interface. Therefore the crystal defects and serious lattice deformations on the interface have not been found. A defect area with a shape of inverted triangle exists in the edge of photosensitive region. The main types of the defects in the area are stacking faults and microtwins. The stacking faults are on (111), and the thickness of the most microtwins is less than 4 interplanar spacing and the twin plane is (111). The Si 0.65 Ge 0.35 and UD Si layers on amorphous SiO 2 layer consist of polycrystals grown by random nucleation, and are in wave. | 刘安生 刘峥 邵贝羚 王敬 | 2000 | 中国有色金属学会会刊:英文版2000，10，2： | 0 |
| 13 | Research progress in quantum key distribution显示文摘Quantum key distribution(QKD)is a sophisticated method for securing information by leveraging the principles of quantum mechanics.Its objective is to establish a confidential key between authorized partners who are connected via both a quantum channel and a classical authentication channel.This paper presents a comprehensive overview of QKD protocols,chip-based QKD systems,quantum light sources,quantum detectors,fiber-based QKD networks,space-based QKD systems,as well as the applications and prospects of QKD technology. | 张春雪 吴丹 崔鹏伟 马俊驰 王玥 安俊明 | 2023 | Chinese Physics B2023，32，12： | 0 |
| 14 | Design of CsI(TI) detector system to search for lost radioactive source显示文摘This report presents a design system based on the use of CsI(TI) detectors to search for lost radioactive sources that are dangerous and harmful to individuals, including searching persons. For this purpose, the GEANT4 simulation toolkit was utilized to develop a system based on three detectors. Various simulated analyses were performed on the dose rates of the three detectors using different source–detector distances and detector separation. There were good agreement between the simulated results and the experimentally measured data. A new method was discussed to detect and search for radioactive sources based only on the dose rates in detectors with source activity. Numerical analyses were performed based on the measured dose rates and the difference of distances to determine the actual location of the lost single or multiple γ-ray sources at a specific angle. The detection limit was calculated from the background radiation to establish the sensitivity and capability of the proposed detector system. This system can be applied in fields in which it is necessary to locate unknown radioactive sources. | Waseem Khan Chao-Hui He Qing-Min Zhang Yu Cao Wei-Tao Yang | 2019 | Nuclear Science and Techniques2019，30，9： | 0 |
| 15 | Wavelength dependence of intrinsic detection efficiency of NbN superconducting nanowire single-photon detector显示文摘Superconducting nanowire single-photon detectors(SNSPDs) have attracted considerable attention owing to their excellent detection performance;however, the underlying physics of the detection process is still unclear.In this study, we investigate the wavelength dependence of the intrinsic detection efficiency(IDE) for NbN SNSPDs.We fabricate various NbN SNSPDs with linewidths ranging from 30 nm to 140 nm.Then, for each detector, the IDE curves as a function of bias current for different incident photon wavelengths of 510–1700 nm are obtained.From the IDE curves, the relations between photon energy and bias current at a certain IDE are extracted.The results exhibit clear nonlinear energy–current relations for the NbN detectors, indicating that a detection model only considering quasiparticle diffusion is unsuitable for the meander-type NbN-based SNSPDs.Our work provides additional experimental data on SNSPD detection mechanism and may serve as an interesting reference for further investigation. | 王勇 李浩 尤立星 吕超林 王河清 张兴雨 张伟君 周慧 张露 杨晓燕 王镇 | 2019 | Chinese Physics B2019，28，7： | 0 |
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