共查询到18条相似文献,搜索用时 140 毫秒
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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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《光子学报》2015,(11)
针对行波探测器阵列只合成多个光电二极管的输出功率而不能提高工作带宽的问题,提出了一种多元T型电路结构的阵列探测器.通过在各个光电二极管支路串联电容降低等效电容,减小结电容对探测器截止频率的影响,再用电感连接各个光电二极管支路构成T型滤波器电路结构,在合成多个光电二极管输出功率的同时增加了工作带宽.仿真结果表明,在光电二极管支路串联与光电二极管结电容相等大小的电容时,四元T型阵列探测器相比四元行波探测器阵列输出功率减少了一半,但工作带宽提高了一倍,而相比于传统探测器则在输出功率和工作带宽上都提高了一倍,此外八元T型阵列探测器与四元行波探测器阵列输出功率相同,工作带宽提高了一倍. 相似文献
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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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中国散裂中子源需要建设一台多功能反射谱仪中子探测器,满足在10年运行期间内,50%(@2A)以上的探测效率、好于2 mm的二维位置分辨、200 mm×200 mm的灵敏面积、3倍的n/γ分辨能力及良好的二维成像性能.基于此要求,探测器因此采用基于高气压~3He气体的多丝正比室,并以满足反射谱仪的探测效率、位置分辨、长期稳定工作和n/y分辨能力为目标进行探测器的设计.本文经过模拟和实验计算得出:以9 mm厚的铝合金入射窗、铝丝密封的高气压腔体和6 bar~3He+2.5 bar C_3H_8的工作气体的设计,可满足探测器对2 A中子10年运行期间内54%以上的探测效率要求;探测器对中子的位置分辨可达到1.4 mm左右;设计的气体净化系统,拥有2 L/min的气流速度可有效去除探测器内的负电性杂质气体,气体循环净化后可提高探测器约27%的气体增益,保证探测器长期稳定的运行;通过对~(252)Cf中子源的能谱测量和成像测量,得出探测器的n/γ分辨能力在5倍以上和均匀的成像结果.研制的探测器满足反射谱仪需求,并已在中国散裂中子源反射谱仪靶站就位联调. 相似文献
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高温超导3mm波成像技术研究 总被引:1,自引:0,他引:1
为了探讨高温超导探测器的应用前景 ,研制了 1 2元线列高温超导探测器和成像原理样机。1 2元高温超导探测器的黑体平均 D*≥ 1 .8× 1 0 9cm Hz1/ 2 W- 1,平均 R≥ 1 .9× 1 0 4 VW- 1和 3mm辐射响应平均 D* ≥ 7.5× 1 0 8cm Hz1/ 2 W- 1,平均 R≥ 1 .6× 1 0 4 VW- 1。采用能量探测器代替外差混频器件研制的成像系统对 3mm辐射成像获得成功 ,预示高温超导探测器 (Bolometer)在 3mm波可得到广泛应用。 相似文献
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一种高精度光纤测温系统工作波长的优化设计 总被引:3,自引:0,他引:3
基于基尔霍夫定律 ,利用钽酸锂热释电探测器设计了一种实用化的双波长、高精度光纤测温系统。依照测温系统中单个探测器的温度分辨力、R(T)~T曲线的线性度、R(T)~T曲线的温度灵敏度及其相对温度灵敏度与各主要技术参量之间的关系 ,对采用钽酸锂热释电探测器作光电转换器件实现的实用化实时测温系统的工作波长进行了优化设计。实验表明 ,在测温范围 4 0 0~ 130 0℃内 ,当系统工作在λ1=2 .1μm、λ2 =2 .3μm时 ,其温度灵敏度高于 1.0× 10 -4℃ -1,相对温度灵敏度不低于 0 9,测温精度不低于 0 15 %。均符合设计要求 相似文献
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Yu. V. Gusakov I. A. Zhukov V. M. Lysan V. V. Myalkovskii A. F. Novgorodov V. D. Peshekhonov 《Physics of Particles and Nuclei Letters》2006,3(3):206-210
The automated stand developed and created by the collaboration ATLAS for testing the wheel modules of the TRT ATLAS straw detectors allows a complete check of the module that defines the serviceability of all its channels and measures the gas gain inhomogeneity along its length for each straw. The results of testing the “B” type modules manufactured at the Laboratory of Particle Physics, JINR are presented. 相似文献
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A. L. Gongadze 《Physics of Particles and Nuclei》2016,47(2):270-289
The increase in luminosity and energy of the Large hadron collider (LHC) in the next upgrade (Phase-1) in 2018–2019 will lead to a significant increase in radiation load on the ATLAS detector, primarily in the areas close to the interaction point of the LHC proton beams. One of these regions is the Small Wheel of the ATLAS Muon Spectrometer. It is planned to be replaced with the New Small Wheel that will have Micromegas chambers as main coordinate detectors. The paper gives an overview of all existing types of Micromegas detectors with special focus on the Micromegas chambers for the ATLAS detector upgrade. 相似文献
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E. V. Kalinin Yu. I. Stozhkov 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(7):957-959
Variations in the solar-neutrino counting rates have been searched for through joint analysis of the independent data from Cl-Ar (Davis’ experiment) and Ga-Ge (SAGE experiment) detectors. The measurement data from these two detectors cover the period from 1970 to 2005. Quasi-two-year variations in the counting rates of the Cl-Ar and Ga-Ge detectors and a correlation between their sessions with a high counting rate and intense cosmic-ray flares on the Sun have been found. 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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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sFEB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 characteristics and principles of multilevel trigger systems of the ATLAS and CMS detectors are considered. Calorimeter algorithms for particle identification are described. The parameters of the trigger chambers used for muon track identification are presented. Methods for designing custom processors based on custom integrated circuits and programmable arrays are described. The parameters of the trigger systems of the ATLAS and CMS detectors are compared. 相似文献
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Agafonov IN Chekhova MV Iskhakov TS Penin AN Rytikov GO Shcherbina OA 《Optics letters》2011,36(8):1329-1331
We report testing of the new absolute method of photodetector calibration based on the difference-signal measurement for two-mode squeezed vacuum by comparison with the traditional absolute method based on coincidence counting. Using low-gain parametric downconversion, we have measured the quantum efficiency of a counting detector by both methods. The difference-signal method was adapted for the counting detectors by taking into account the dead-time effect. 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