共查询到19条相似文献,搜索用时 140 毫秒
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通过实验测量和理论分析, 从载流子动力学角度研究了用于脉冲辐射探测的CVD金刚石薄膜探测器的适用结构、电荷收集效率和时间响应性能. 结果表明, CVD金刚石薄膜可以制成均匀型结构的探测器; 薄膜中的缺陷会降低探测器的电荷收集效率, 探测器的电荷收集效率随场强增大而增大直至饱和. 已研制的CVD金刚石探测器电荷收集时间可达719ps, 在2.5V/μm场强下达到饱和, 电荷收集效率
达60.5%; 晶格散射是影响探测器时间响应的主要因素, 选用大晶粒甚至单晶金刚石薄膜可以提高探测器时间响应. 相似文献
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一个正在建设的位于韩国Y2L地下实验室的低能暗物质探测实验中,采用了CsI(T1)晶体反符合探测器作为主动屏蔽体.本工作对CsI(T1)晶体反符合探测器的实验性能进行了研究.通过FADC系统记录的脉冲波形数据,研究了探测器的能量分辨率和波形甄别的能力;研究相同能量γ射线入射到反符合探测器不同位置的相对光输出将有助于选择探测器的工作参数;为了解晶体自身放射性对暗物质测量的影响,利用低本底HPGe探测器对CsI(T1)晶体内部的放射性进行了测量,得到晶体内部Cs同位素的放射性活度.探测器系统进行了约18d的试运行取数.实验数据表明,CsI(T1)晶体探测器的反符合效率约为31%,HPGe探测器的本底计数率水平约为133cpd.为了进行暗物质探测研究,需要采取有效的方法进一步降低探测器的本底水平. 相似文献
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通过脉冲星辐射信号特征研究和空间观测需求分析,提出了一种面向导航应用的X射线探测器测试方法.首先推导了X射线光子欠探测概率公式,分析了不同星源流量及不同探测器时间分辨率下对光子探测能力的影响.通过数值模拟方法建立了脉冲到达时间与脉冲轮廓相似度的关系.处理了我国硬X射线调制望远镜的Crab脉冲星观测数据,研究了不同能段脉冲轮廓差异.其次,系统地研究了面向导航应用的X射线探测器测试及处理方法,并利用地面测试系统完成了一款自主研发的聚焦型X射线探测器测试工作.通过数据分析得到,聚焦型探测器本底噪声为3.63×10-5ph/(cm~2·s~(-1)),工作能区为0.2~22.7keV,时间分辨率为4.17μs,空间响应约为5′,能量非线性为0.52%,能量分辨率优于200eV@5.7keV,典型探测效率为39.18%@4.51keV.聚焦型X射线探测器在弱脉冲信号及强背景噪声下,均能还原出Crab脉冲星脉冲轮廓,在2 400s内能够探测到辐射流量弱于背景噪声10倍的脉冲信号.结果表明,该款聚焦型探测器性能优秀,能够满足导航脉冲星(如PSR B1509)的空间观测需求,也验证了测试方法的可行性. 相似文献
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初步研制了一种用于300~400GHz频段的亚毫米波大功率脉冲探测器。基于强电场下的热电子效应,将n型硅探测芯片置入波导WR10的宽边,构成了探测器的过模探测模块。采用光刻和电镀工艺完成了探测芯片的加工,实现了很好的欧姆接触和尺寸精度。对集成的探测器样机进行了亚毫米波大功率脉冲测试和电压驻波比测量。结果表明:探测器样机的响应时间快达ps量级,相对灵敏度约为0.46kW-1,电压驻波比小于2.4,最大承受功率不小于数十W,与模拟结果符合得较好,满足亚毫米波大功率脉冲的直接探测需求。 相似文献
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YAN Zhen FENG Cun-Feng ZHU Cheng-Guang SUN Yan-Sheng ZHANG Nai-Jian HE Mao 《中国物理C(英文版)》2006,30(1):52-56
The development and production of 400 sets of T9 type TGC (Thin Gap Chamber) for ATLAS experiment are undertaken by Shandong University. In this paper, the process of development of T9 type TGC is introduced first and then the method of measuring the detection efficiency of the TGC is described. The testing result of detection efficiency of 288 sets of T9 type TGC built by Shandong University shows that all the detectors excellently fulfill the quality requirements of ATLAS experiment. 相似文献
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欧洲核子中心的大型强子对撞机探测器预计工作在 1 0 34 /(cm2·s)亮度 ,这将导致实验大厅的本底非常严重 .薄气隙室将作为 ATLAS实验中的前端 μ子触发器 .按照模拟计算 ,实验大厅薄气隙室周围的主要本底是中子和光子 .报告了薄气隙室探测器的 γ灵敏度的实验测量 .使用 γ能量从20ke V到1.8Me V的放射性 γ源 .目前测量的灵敏度小于 1 % ,与用 EGS4模拟计算结果相吻合. The Large Hadron Collider (LHC) at the European Laboratory for Particle Physics (CERN) is expected to operate at the luminosity of 10 34 /(cm 2 ·s), and the resulting background condition in the experimental hall would be quit severe. Thin Gap Chamber (TGC) will be used for forward muon triggering in the ATLAS experiment. According to a simulation, the main source of the background around TGC in the experimental hall is neutrons and photons. The sensitivity measurement for TGC... 相似文献
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ATLAS探测器PHASE Ⅰ升级过程中,将新建NSW探测器用于提高对Muon轨迹的探测效率,从而进一步提高一级触发效率。NSW由768个sTGC探测器模块组成,共计约33万探测通道。中国科学技术大学代表中国合作组承担了全部sTGC前端读出电子学设计和生产任务,开发了用于读出strip信号的s FEB读出板和读出pad与wire信号的pFEB读出板,制定了一套完整的FEB测试方案和测试流程。为了对生产完成的上千块FEB进行批量测试,严格按照sTGC读出系统要求,设计了能够同时测试FEB板704通道的多参数批量测试系统。利用FEB批量测试系统,完成了全部850块pFEB和sFEB板测试,并交付ATLAS合作组安装到了sTGC探测器上。 相似文献
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The laser reference line method and its comparison to a total station in an ATLAS like configuration
V. Batusov J. Budagov M. Lyablin J. -Ch. Gayde B. Di Girolamo D. Mergelkuhl M. Nessi 《Physics of Particles and Nuclei Letters》2014,11(3):299-308
A new type of measuring system, the Laser Reference Line, is proposed as a metrological tool and can be used within limited space to ensure a precise installation along an axis on the ATLAS interaction point. A simplified ATLAS like beam pipe mock-up is used for this test. The coordinates of the beam pipe are measured three times using the new method and a Total Station. The measurements agree within the measurement error of the Total Station, which indicates that the precision of the laser reference line is suitable for this specific task in the ATLAS experiment. 相似文献
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Performance of the Transition Radiation Tracker (TRT) at the ATLAS experiment with argon and krypton gas mixtures was simulated. The efficiency of transition radiation registration, which is necessary for electron identification, was estimated along with the electron identification capabilities under such conditions. 相似文献
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S. Ostapchenko 《Physics letters. [Part B]》2011,703(5):588-592
The model-dependence of the relation between the inelastic and various minimum-bias proton-proton cross sections is analyzed, paying a special attention to the sensitivity of minimum-bias triggers to diffractive collisions. Concentrating on the trigger selections of the ATLAS experiment, the measured cross sections are compared to predictions of a number of hadronic Monte Carlo models used in the cosmic ray field. It is demonstrated that the ATLAS results are able to discriminate between different models and between certain theoretical approaches for soft multi-particle production. On the other hand, the strong model-dependence of the selection efficiency of the minimum-bias triggers prevents one from inferring high mass diffraction rate from the discussed data. Moreover, the measured cross sections prove to be insensitive to the production of low mass diffractive states in proton-proton collisions. Consequently, a reliable determination of the total inelastic cross section requires forward proton tracking by a dedicated experiment. 相似文献
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The trigger system of the ATLAS experiment is designed to reduce the event rate from the LHC nominal bunch crossing at 40 MHz to about 1 kHz, at the design luminosity of 1034 cm–2 s–1. After a successful period of data taking from 2010 to early 2013, the LHC already started with much higher instantaneous luminosity. This will increase the load on High Level Trigger system, the second stage of the selection based on software algorithms. More sophisticated algorithms will be needed to achieve higher background rejection while maintaining good efficiency for interesting physics signals. The Fast TracKer (FTK) is part of the ATLAS trigger upgrade project. It is a hardware processor that will provide, at every Level-1 accepted event (100 kHz) and within 100 microseconds, full tracking information for tracks with momentum as low as 1 GeV. Providing fast, extensive access to tracking information, with resolution comparable to the offline reconstruction, FTK will help in precise detection of the primary and secondary vertices to ensure robust selections and improve the trigger performance. FTK exploits hardware technologies with massive parallelism, combining Associative Memory ASICs, FPGAs and high-speed communication links. 相似文献