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Limits on Light Weakly Interacting Massive Particles from the First 102.8 kg×day Data of the CDEX-10 Experiment

Physical Review Letters 2018年第24期120卷 241301-241301页

作者： H. Jiang L. P. Jia Q. Yue K. J. Kang J. P. Cheng Y. J. Li H. T. Wong M. Agartioglu H. P. An J. P. Chang J. H. Chen Y. H. Chen Z. Deng Q. Du H. Gong L. He J. W. Hu Q. D. Hu H. X. Huang H. B. Li H. Li J. M. Li J. Li X. Li X. Q. Li Y. L. Li B. Liao F. K. Lin S. T. Lin S. K. Liu Y. D. Liu Y. Y. Liu Z. Z. Liu H. Ma J. L. Ma H. Pan J. Ren X. C. Ruan B. Sevda V. Sharma M. B. Shen L. Singh M. K. Singh T. X. Sun C. J. Tang W. Y. Tang Y. Tian G. F. Wang J. M. Wang L. Wang Q. Wang Y. Wang S. Y. Wu Y. C. Wu H. Y. Xing Y. Xu T. Xue L. T. Yang S. W. Yang N. Yi C. X. Yu H. J. Yu J. F. Yue X. H. Zeng M. Zeng Z. Zeng F. S. Zhang Y. H. Zhang M. G. Zhao J. F. Zhou Z. Y. Zhou J. J. Zhu Z. H. Zhu Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics Tsinghua University Beijing 100084 College of Nuclear Science and Technology Beijing Normal University Beijing 100875 Institute of Physics Academia Sinica Taipei 11529 Department of Physics Dokuz Eylül University Ízmir 35160 Department of Physics Tsinghua University Beijing 100084 NUCTECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu 610051 College of Physical Science and Technology Sichuan University Chengdu 610064 Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 School of Physics Nankai University Tianjin 300071 Department of Physics Banaras Hindu University Varanasi 221005 Department of Physics Beijing Normal University Beijing 100875

We report the first results of a light weakly interacting massive particles (WIMPs) search from the CDEX-10 experiment with a 10 kg germanium detector array immersed in liquid nitrogen at the China Jinping Underground Laboratory with a physics data size of 102.8 kg day. At an analysis threshold of 160 eVee, improved limits of 8×10−42 and 3×10−36 cm2 at a 90% confidence level on spin-independent and spin-dependent WIMP-nucleon cross sections, respectively, at a WIMP mass (mχ) of 5 GeV/c2 are achieved. The lower reach of mχ is extended to 2 GeV/c2.

关键词： Cosmic rays & astroparticles Particle dark matter Weakly interacting massive particles Dark matter detectors

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Observation of non-local effects in ion transport channel in J-TEXT plasmas

arXiv

引用

arXiv 2018年

作者： Shi, Yuejiang Yang, Zhoujun Chen, Zhongyong Cheng, Zhifeng Zhang, Xiaoyi Yan, Wei Wen, Jie Cai, Qinxue Zhao, Kaijun Hong, Seulchan Kwon, JaeMin Diamond, Partick H. Shi, Peng Zhou, Hao Pan, Xiaoming Chen, Zhipeng Yang, SeongMoo Dong, Yunbo Wang, Lu Ding, YongHua Liang, Yunfeng Shi, Zhongbin Na, Yong-Su Department of Nuclear Engineering Seoul National University Seoul Korea Republic of International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China College of Nuclear Science and Engineer East China University of Technology Nanchang China National Fusion Research Institute Daejeon Korea Republic of Southwestern Institute of Physics Chengdu China CMTFO and CASS University of California San Diego United States Jülich Germany

In cold pulse experiments in J-TEXT, the ion transport shows similar non-local response as the electron transport channel. Very fast ion temperatures decreases are observed in the edge, while the ion temperature in core promptly begin to rise after the injection of cold pulse. Moreover, the cutoff density is also found for the ion non-local effect. The experimental observed density fluctuation in a high frequency ranging from 500 kHz to 2 MHz is obviously reduced in the whole plasma region during non-local transport (NLT) phase. Copyright © 2018, The Authors. All rights reserved.

关键词： Electron transport properties

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A unified triangle carrier based PWM strategy for three-phase N-level diode clamped inverters

A unified triangle carrier based PWM strategy for three-phas...

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Annual Conference of Industrial Electronics Society

作者： Kai Li Chuan Xie Min Wei Zhenhua Dong Mengshu Li Josep M. Guerrero School of Automation Engineering University of Electronic Science and Technology of China Chengdu China Nuclear Power Institute of China Chengdu China Department of Energy Technology Aalborg University Aalborg Denmark

The triangle carrier based pulse width modulation (TCB-PWM) can be functionally equivalent to space vector base PWM (SVB-PWM). For multi-level inverter, it is very difficult to realize the SVB-PWM because its vector space is very complex. In this paper, a unified TCB-PWM strategy for three-phase N-level diode clamped inverter, including continuous PWM (CPWM) and discontinuous PWM (DPWM), is proposed. With the proposed strategy, the final modulation signals can be easily obtained by twice common mode voltage (CMV) injections. The PWM driver signals are generated by comparing the final modulation signals and phase deposition triangle carriers. Especially, the procedures to realize different types of PWM method are demonstrated in this paper. The proposed method can be directly implemented in digital processers.

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Motion Control of Manipulators Based on Model-free Adaptive Control

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IOP Conference Series: Materials Science and engineering 2018年第1期428卷

作者： Ziqiao Zhang Songyi Dian Department of Automation College of Electrical Engineering and Information Technology Sichuan University Chengdu Sichuan China

In this paper, the model-free adaptive control (MFAC) method which is based on compact form dynamic linearization (CFDL) of multiple input and multiple output (MIMO) nonlinear systems is applied to the control of Puma560 manipulator. The controller design requires only the input and output data of the system. The simulation results verify the effectiveness of the model-free adaptive control method. Based on the structure of the controller, the function of controller parameters is analysed. By adding external disturbances, the anti-interference of Puma560 based on model-free adaptive control can be verified. The model free adaptive controller is optimized.

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Research on Kinematics Simulation of Continuum Robot Based on ADAMS

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IOP Conference Series: Materials Science and engineering 2018年第1期428卷

作者： Yueling Zhang Lin Chen Songyi Dian Department of Automation College of Electrical Engineering and Information Technology Sichuan University Chengdu Sichuan China

As a prevalent biological inspired robot, continuum robots has good bending performance and excellent flexibility. In this paper, a continuum robot is designed, then the kinematic model is established to analyze the motion characteristics of the robot. Secondly, the simulation model of the continuum robot is conducted in ADAMS to verify the feasibility of the established kinematic model and to simulate its bending ability. At the same time, it also showed that ADAMS software had value in building a flexible body model.

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Searching for Neutrino-less double beta decay of 136Xe with PandaX-II liquid Xenon detector *

arXiv

引用

arXiv 2019年

作者： Ni, Kaixiang Lai, Yihui Abdukerim, Abdusalam Chen, Wei Chen, Xun Chen, Yunhua Cui, Xiangyi Fan, Yingjie Fang, Deqing Fu, Changbo Geng, Lisheng Giboni, Karl Giuliani, Franco Gu, Linhui Guo, Xuyuan Han, Ke He, Changda Huang, Di Huang, Yan Huang, Yanlin Huang, Zhou Ji, Peng Ji, Xiangdong Ju, Yonglin Liang, Kun Liu, Huaxuan Liu, Jianglai Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Namwongsa, Parinya Ning, Jinhua Ning, Xuyang Ren, Xiangxiang Shang, Changsong Si, Lin Tan, Andi Wang, Anqing Wang, Hongwei Wang, Meng Wang, Qiuhong Wang, Siguang Wang, Xiuli Wang, Zhou Wu, Mengmeng Wu, Shiyong Xia, Jingkai Xiao, Mengjiao Xie, Pengwei Yan, Binbin Yang, Jijun Yang, Yong Yu, Chunxu Yuan, Jumin Zhang, Dan Zhang, Hongguang Zhang, Tao Zhao, Li Zheng, Qibin Zhou, Jifang Zhou, Ning Zhou, Xiaopeng INPAC and School of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Shanghai200240 China Yalong River Hydropower Development Company Ltd. 288 Shuanglin Road Chengdu610051 China School of Physics Nankai University Tianjin300071 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China School of Physics International Research Center for Nuclei and Particles in the Cosmos Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing100191 China School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai200093 China Tsung-Dao Lee Institute Shanghai200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Physics Peking University Beijing100871 China Department of Physics University of Maryland College ParkMD20742 United States Shandong University Jinan250100 China Center of High Energy Physics Peking University Beijing100871 China

We report the Neutrino-less Double Beta Decay (NLDBD) search results from PandaX-II dual-phase liquid xenon time projection chamber. The total live time used in this analysis is 403.1 days from June 2016 to August 2018. With NLDBD-optimized event selection criteria, we obtain a fiducial mass of 219 kg of natural xenon. The accumulated xenon exposure is 242 kg·yr, or equivalently 22.2 kg·yr of 136Xe exposure. At the region around 136Xe decay Q-value of 2458 keV, the energy resolution of PandaX-II is 4.2%. We find no evidence of NLDBD in PandaX-II and establish a lower limit for decay half-life of 2.4 ×1023 yr at the 90% confidence level, which corresponds to an effective Majorana neutrino mass mββ Copyright © 2019, The Authors. All rights reserved.

关键词： Galaxies

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An Improved Evaluation of the Neutron Background in the PandaX-II Experiment

arXiv

引用

arXiv 2019年

作者： Wang, Qiuhong Abdukerim, Abdusalam Chen, Wei Chen, Xun Chen, Yunhua Cui, Xiangyi Fan, Yingjie Fang, Deqing Fu, Changbo Geng, Lisheng Giboni, Karl Giuliani, Franco Gu, Linhui Guo, Xuyuan Han, Ke He, Changda Huang, Di Huang, Yan Huang, Yanlin Huang, Zhou Ji, Peng Ji, Xiangdong Ju, Yonglin Lai, Yihui Liang, Kun Liu, Huaxuan Liu, Jianglai Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Namwongsa, Parinya Ni, Kaixiang Ning, Jinhua Ning, Xuyang Ren, Xiangxiang Shang, Changsong Si, Lin Tan, Andi Wang, Anqing Wang, Hongwei Wang, Meng Wang, Siguang Wang, Xiuli Wang, Zhou Wu, Mengmeng Wu, Shiyong Xia, Jingkai Xiao, Mengjiao Xie, Pengwei Yan, Binbin Yang, Jijun Yang, Yong Yu, Chunxu Yuan, Jumin Zhang, Dan Zhang, Hongguang Zhang, Tao Zhao, Li Zheng, Qibin Zhou, Jifang Zhou, Ning Zhou, Xiaopeng Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China INPAC School of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Shanghai200240 China Yalong River Hydropower Development Company Ltd. 288 Shuanglin Road Chengdu610051 China School of Physics Nankai University Tianjin300071 China School of Physics International Research Center for Nuclei and Particles in the Cosmos Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing100191 China School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai200093 China Tsung-Dao Lee Institute Shanghai200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Physics Peking University Beijing100871 China Department of Physics University of Maryland College ParkMD20742 United States Shandong University Jinan250100 China Center of High Energy Physics Peking University Beijing100871 China University of Chinese Academy of Sciences Beijing100049 China

In dark matter direct detection experiments, neutron is a serious source of background, which can mimic the dark matter-nucleus scattering signals. In this paper, we present an improved evaluation of the neutron background in the PandaX-II dark matter experiment by a novel approach. Instead of fully relying on the Monte Carlo simulation, the overall neutron background is determined from the neutron-induced high energy signals in the data. In addition, the probability of producing a dark-matter-like background per neutron is evaluated with a complete Monte Carlo generator, where the correlated emission of neutron(s) and γ(s) in the (α, n) reactions and spontaneous fissions is taken into consideration. With this method, the neutron backgrounds in the Run 9 (26-ton-day) and Run 10 (28-ton-day) data sets of PandaX-II are estimated to be 0.66±0.24 and 0.47±0.25 events, respectively. Copyright © 2019, The Authors. All rights reserved.

关键词： Neutron sources

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Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search

arXiv

引用

arXiv 2018年

作者： Jiang, H. Yang, L.T. Yue, Q. Kang, K.J. Cheng, J.P. Li, Y.J. Wong, H.T. Agartioglu, M. An, H.P. Chang, J.P. Chen, J.H. Chen, Y.H. Deng, Z. Du, Q. Gong, H. He, L. Hu, J.W. Hu, Q.D. Huang, H.X. Jia, L.P. Li, H.B. Li, H. Li, J.M. Li, J. Li, X. Li, X.Q. Li, Y.L. Liao, B. Lin, F.K. Lin, S.T. Liu, S.K. Liu, Y.D. Liu, Y.Y. Liu, Z.Z. Ma, H. Ma, J.L. Pan, H. Ren, J. Ruan, X.C. Sevda, B. Sharma, V. Shen, M.B. Singh, L. Singh, M.K. Sun, T.X. Tang, C.J. Tang, W.Y. Tian, Y. Wang, G.F. Wang, J.M. Wang, L. Wang, Q. Wang, Y. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, Y. Xue, T. Yang, S.W. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, X.H. Zeng, M. Zeng, Z. Zhang, F.S. Zhang, Y.H. Zhao, M.G. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Zhu, Z.H. Department of Engineering Physics Tsinghua University Beijing100084 China College of Nuclear Science and Technology Beijing Normal University Beijing100875 China Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Dokuz Eylül University Izmir35160 Turkey Department of Physics Tsinghua University Beijing100084 China NUCTECH Company Beijing100084 YaLong River Hydropower Development Company Chengdu610051 College of Physical Science and Technology Sichuan University Chengdu610064 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India Department of Physics Beijing Normal University Beijing100875 China

The CDEX-10 experiment searches for light weakly-interacting massive particles, a form of dark matter, at the China JinPing underground laboratory, where approximately 10 kg of germanium detectors are arranged in an array and immersed in liquid nitrogen. Herein, we report on the experimental apparatus, detector characterization, and spectrum analysis of one prototype detector. Owing to the higher rise-time resolution of the CDEX-10 prototype detector as compared with CDEX-1B, we identified the origin of an observed category of extremely fast events. For data analysis of the CDEX-10 prototype, we introduced and applied an improved bulk/surface event discrimination method. The results of the new method were compared to those of the CDEX-1B spectrum. Both sets of results showed good consistency in the 0–12 keVee energy range, except for the 8.0 keV K-shell X-ray peak from the external copper. Copyright © 2018, The Authors. All rights reserved.

关键词： Liquefied gases

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Limits on Light Weakly Interacting Massive Particles from the First 102.8 kg × day Data of the CDEX-10 Experiment

arXiv

引用

arXiv 2018年

作者： Jiang, H. Jia, L.P. Yue, Q. Kang, K.J. Cheng, J.P. Li, Y.J. Wong, H.T. Agartioglu, M. An, H.P. Chang, J.P. Chen, J.H. Chen, Y.H. Deng, Z. Du, Q. Gong, H. He, L. Hu, J.W. Hu, Q.D. Huang, H.X. Li, H.B. Li, H. Li, J.M. Li, J. Li, X. Li, X.Q. Li, Y.L. Liao, B. Lin, F.K. Lin, S.T. Liu, S.K. Liu, Y.D. Liu, Y.Y. Liu, Z.Z. Ma, H. Ma, J.L. Pan, H. Ren, J. Ruan, X.C. Sevda, B. Sharma, V. Shen, M.B. Singh, L. Singh, M.K. Sun, T.X. Tang, C.J. Tang, W.Y. Tian, Y. Wang, G.F. Wang, J.M. Wang, L. Wang, Q. Wang, Y. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, Y. Xue, T. Yang, L.T. Yang, S.W. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, X.H. Zeng, M. Zeng, Z. Zhang, F.S. Zhang, Y.H. Zhao, M.G. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Zhu, Z.H. Department of Engineering Physics Tsinghua University Beijing100084 China College of Nuclear Science and Technology Beijing Normal University Beijing100875 China Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Dokuz Eylül University Izmir35160 Turkey Department of Physics Tsinghua University Beijing100084 China NUCTECH Company Beijing100084 YaLong River Hydropower Development Company Chengdu610051 College of Physical Science and Technology Sichuan University Chengdu610064 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India Department of Physics Beijing Normal University Beijing100875 China

We report the first results of a light weakly interacting massive particles (WIMPs) search from the CDEX-10 experiment with a 10 kg germanium detector array immersed in liquid nitrogen at the China Jinping Underground Laboratory with a physics data size of 102.8 kg day. At an analysis threshold of 160 eVee, improved limits of 8 ×10−42 and 3 ×10−36 cm2 at a 90% confidence level on spin-independent and spin-dependent WIMP-nucleon cross sections, respectively, at a WIMP mass (mχ) of 5 GeV/c2 are achieved. The lower reach of mχ is extended to 2 GeV/c2. PACS numbers: 95.35.+d, 29.40.-n, *** Copyright © 2018, The Authors. All rights reserved.

关键词： Germanium alloys

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The Axial Nonlinear Vibration Analysis of Ball-screw about Machine Tool Feeding System

引用

International Journal of Plant engineering and Management 2016年第3期21卷 181-192页

作者： ZENG Hao-ran LIU Nian-cong YANG Jia-rui CHEN Jian-long GENG Wei-tao College of Nuclear Technology and Automation Engineering Chengdu University of Technology

The forced state of the ball-screw of machine tool feeding system is analyzed. The ball-screw is simplified as Timoshenko beam and the differential equation of motion for the ball-screw is built. To obtain the axial vibration equation,the differential equation of motion is simplified using the assumed mode method. Axial vibration equation is in form of Duffing equation and has the characteristics of nonlinearity. The numerical simulation of Duffing equation is proceeded by MATLAB / Simulink. The effect of screw length,exciting force and damping coefficient are researched,and the axial vibration phase track diagram and Poincare section are obtained. The stability and period of the axial vibration are analyzed. The limit cycle of phase track diagram is enclosed. Axial vibration has two type-center singularity distributions on both sides of the origin. The singularity attracts vibration to reach a stable state,and Poincare section shows that axial vibration appears chaotic motion and quasi periodic motion or periodic motion. Singularity position changes with the vibration system parameters,while the distribution doesn’ t change. The period of the vibration is enhanced with increasing frequency and damping coefficient. Test of the feeding system ball-screw axial vibration exists chaos movement. This paper provides a certain theoretical basis for the dynamic characteristic analysis of machine feeding system ball-screw and optimization of structural parameters.

关键词： ball screw Timoshenko beam axial vibration phase diagram Poincare section

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