中国暗物质实验(China Dark matter EXperiment,CDEX)合作组由清华大学牵头,并联合国内多所高校及企业共同开展研究工作。北京师范大学作为成员单位于2017年加入了CDEX合作组,承担了部分研究工作。CDEX合作组致力于利用高纯锗探测技术,...中国暗物质实验(China Dark matter EXperiment,CDEX)合作组由清华大学牵头,并联合国内多所高校及企业共同开展研究工作。北京师范大学作为成员单位于2017年加入了CDEX合作组,承担了部分研究工作。CDEX合作组致力于利用高纯锗探测技术,开展暗物质直接探测等极低本底前沿物理研究。展开更多
暗物质是当今物理学最基本也是最吸引人的前沿研究课题之一,对认识宇宙起源、演变和结构以及物质的本源等基本科学问题具有十分重要的意义.暗物质的理论研究和实验探测经过几十年的积累和发展已经取得了长远的进步.实验上有多种方法可...暗物质是当今物理学最基本也是最吸引人的前沿研究课题之一,对认识宇宙起源、演变和结构以及物质的本源等基本科学问题具有十分重要的意义.暗物质的理论研究和实验探测经过几十年的积累和发展已经取得了长远的进步.实验上有多种方法可以进行暗物质粒子的探测,直接探测是一种非常重要的手段.本文评述了暗物质直接探测方法的原理和当今国际国内采用直接探测法的不同实验的研究现状,着重介绍了中国暗物质实验(China Dark matter Experiment,CDEX)合作组的研究历程、探测技术和数据分析方法、以及研究取得的重要成果和未来规划.展开更多
暗物质探测是当今物理界重大前沿基础科学之一。中国暗物质实验(China Dark matter EXperiment,CDEX)是国内首个自主的暗物质直接探测实验。该实验依托国际最深最大、宇宙线通量最低的中国锦屏地下实验室(CJPL),旨在利用吨量级高纯锗探...暗物质探测是当今物理界重大前沿基础科学之一。中国暗物质实验(China Dark matter EXperiment,CDEX)是国内首个自主的暗物质直接探测实验。该实验依托国际最深最大、宇宙线通量最低的中国锦屏地下实验室(CJPL),旨在利用吨量级高纯锗探测器直接探测暗物质以及无中微子双贝塔衰变实验。CDEX合作组按照探测器质量大小已经历两个阶段,分别为CDEX-11 kg量级和CDEX-1010 kg量级。本文详细介绍了这两个阶段实验中最新重要的暗物质研究进展,包括年度调制效应、亚GeV轻暗物质分析、暗光子分析以及轴子分析。上述结果表明CDEX对低质量暗物质探测处于国际领先水平。CDEX合作组在锦屏地下实验室二期已建成约1700 m3的大型恒温液氮系统,届时将开展国际首个利用大型液氮屏蔽系统直接制冷的高纯锗阵列探测器实验。展开更多
ZYNQ是集成了现场可编程阵列(Field-Programmable Gate Array,FPGA)和高性能双核ARM Cortex-A9处理器的全新架构的SoC(System On Chip)。核电子学领域的数据读出方式,从传统的"处理器+FPGA"的双芯片解决方案到目前的ZYNQ单芯...ZYNQ是集成了现场可编程阵列(Field-Programmable Gate Array,FPGA)和高性能双核ARM Cortex-A9处理器的全新架构的SoC(System On Chip)。核电子学领域的数据读出方式,从传统的"处理器+FPGA"的双芯片解决方案到目前的ZYNQ单芯片解决方案,不仅有效地减小读出电子学硬件的尺寸和功耗,而且极大地提高FPGA和处理器之间的有效带宽,为整个读出电子学带来了新的发展。介绍了基于ZYNQ XC7Z010单芯片读出模块的研制细节,包括新架构和传统架构的对比,新架构硬件设计细节、难点及性能,其中涉及DDR3(Double Data Rate 3)SDRAM(Synchronous Dynamic Random Access Memory)布线的关键问题、千兆以太网接口以及嵌入式Linux的移植等。最后,介绍ZYNQBee在中国暗物质实验(China Dark matter EXperiment,CDEX)高纯锗探测器数据采集板卡上的应用,测试表明:以太网口的数据读出平均带宽超过了700 Mb·s-1。展开更多
The paper is devoted to new, experimentally registered thermo physical problems of high temperature applied external and internal aerodynamics which is defined first of all by intensive interaction of the gaseous medi...The paper is devoted to new, experimentally registered thermo physical problems of high temperature applied external and internal aerodynamics which is defined first of all by intensive interaction of the gaseous media and thermal radiation. The first report section analyses basic complexities of designing high temperature air breathing engines related to origin of so-called ＂unexpected＂ heat of working process. The next parts of the report consider physical, chemical and plasma features of aerodynamics of reentry space blunt bodies and meteors with specified account of thermal radiation influence. Our solutions are based on the classical Dark Matter-Energy simulation. We present special experimental data for Dark Matter pressure registration on the earth conditions.展开更多
PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay search.The central vessel was designed to accommodate a staged target volume increase from initial...PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay search.The central vessel was designed to accommodate a staged target volume increase from initially 120 kg(stage I)to 0.5 t(stage II)and eventually to a multi-ton scale.The experiment is located in the Jinping Deep-Underground Laboratory in Sichuan,China.The detector operates in dual-phase mode,allowing detection of both prompt scintillation,and ionization charge through proportional scintillation.In this paper a detailed description of the stage I detector design and performance as well as results established during the commissioning phase are presented.展开更多
文摘中国暗物质实验(China Dark matter EXperiment,CDEX)合作组由清华大学牵头,并联合国内多所高校及企业共同开展研究工作。北京师范大学作为成员单位于2017年加入了CDEX合作组,承担了部分研究工作。CDEX合作组致力于利用高纯锗探测技术,开展暗物质直接探测等极低本底前沿物理研究。
文摘暗物质是当今物理学最基本也是最吸引人的前沿研究课题之一,对认识宇宙起源、演变和结构以及物质的本源等基本科学问题具有十分重要的意义.暗物质的理论研究和实验探测经过几十年的积累和发展已经取得了长远的进步.实验上有多种方法可以进行暗物质粒子的探测,直接探测是一种非常重要的手段.本文评述了暗物质直接探测方法的原理和当今国际国内采用直接探测法的不同实验的研究现状,着重介绍了中国暗物质实验(China Dark matter Experiment,CDEX)合作组的研究历程、探测技术和数据分析方法、以及研究取得的重要成果和未来规划.
文摘ZYNQ是集成了现场可编程阵列(Field-Programmable Gate Array,FPGA)和高性能双核ARM Cortex-A9处理器的全新架构的SoC(System On Chip)。核电子学领域的数据读出方式,从传统的"处理器+FPGA"的双芯片解决方案到目前的ZYNQ单芯片解决方案,不仅有效地减小读出电子学硬件的尺寸和功耗,而且极大地提高FPGA和处理器之间的有效带宽,为整个读出电子学带来了新的发展。介绍了基于ZYNQ XC7Z010单芯片读出模块的研制细节,包括新架构和传统架构的对比,新架构硬件设计细节、难点及性能,其中涉及DDR3(Double Data Rate 3)SDRAM(Synchronous Dynamic Random Access Memory)布线的关键问题、千兆以太网接口以及嵌入式Linux的移植等。最后,介绍ZYNQBee在中国暗物质实验(China Dark matter EXperiment,CDEX)高纯锗探测器数据采集板卡上的应用,测试表明:以太网口的数据读出平均带宽超过了700 Mb·s-1。
文摘The paper is devoted to new, experimentally registered thermo physical problems of high temperature applied external and internal aerodynamics which is defined first of all by intensive interaction of the gaseous media and thermal radiation. The first report section analyses basic complexities of designing high temperature air breathing engines related to origin of so-called ＂unexpected＂ heat of working process. The next parts of the report consider physical, chemical and plasma features of aerodynamics of reentry space blunt bodies and meteors with specified account of thermal radiation influence. Our solutions are based on the classical Dark Matter-Energy simulation. We present special experimental data for Dark Matter pressure registration on the earth conditions.
基金supported by a 985 grant from Shanghai Jiao Tong Universitythe National Basic Research Program of China (Grant No. 2010CB833005)+4 种基金the National Natural Science Foundation of China (Grant No. 11055003)the Office of Science and Technology in Shanghai Municipal Government (Grant No. 11DZ2260700)sponsored by Shandong University, Peking Universitythe University of Marylandthe University of Michigan
文摘PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay search.The central vessel was designed to accommodate a staged target volume increase from initially 120 kg(stage I)to 0.5 t(stage II)and eventually to a multi-ton scale.The experiment is located in the Jinping Deep-Underground Laboratory in Sichuan,China.The detector operates in dual-phase mode,allowing detection of both prompt scintillation,and ionization charge through proportional scintillation.In this paper a detailed description of the stage I detector design and performance as well as results established during the commissioning phase are presented.
