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LHAASO-WCDA is a large ground-based water Cherenkov detector array planned to be built at Shangri-La, Yunnan Province, China. As a major component of the LHAASO project, the main purpose of LHAASO-WCDA is to survey the northern sky for very-high-energy (above 100 GeV) gamma ray sources and measure the spectrum. To gain full knowledge of the water Cherenkov technique and to investigate the engineering issues, a 9-cell detector array has been built at the Yang-Ba-Jing site, neighboring the ARGO-YBJ experiment. With the array, charge calibration methods for both low and high ranges of the PMT readout are studied, whose result shows that a precision at several percentages can be reached, which can satisfy the requirement of the detector array. During the long term operation, the charge calibration stability and environmental affection are studied; in this paper, the results are discussed. These calibration methods are proposed to be applied in the future LHAASO-WCDA project. 相似文献
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LHAASO-WCDA is a large ground-based water Cherenkov detector array planned to be built at ShangriLa, Yunnan Province, China. As a major component of the LHAASO project, the main purpose of LHAASO-WCDA is to survey the northern sky for very-high-energy(above 100 GeV) gamma ray sources and measure the spectrum. To gain full knowledge of the water Cherenkov technique and to investigate the engineering issues, a 9-cell detector array has been built at the Yang-Ba-Jing site, neighboring the ARGO-YBJ experiment. With the array, charge calibration methods for both low and high ranges of the PMT readout are studied, whose result shows that a precision at several percentages can be reached, which can satisfy the requirement of the detector array. During the long term operation, the charge calibration stability and environmental afection are studied; in this paper, the results are discussed. These calibration methods are proposed to be applied in the future LHAASO-WCDA project. 相似文献
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An effort to search for Kolar-like events within the data set of the L3+C experiment is reported. From a total of 0.89×10^10 triggered events there are no reliable two-prong Kolar-like events observed. The corresponding event flux upper limit 7.1 × 10^-13 cm^-2. s^-1 . sr^-1 at 90% confidence level is deduced based on some reasonable assumptions. 相似文献
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地下多μ现象的观测是研究“膝”区(1015—1016eV)宇宙线成分的一种重要方法.现有的地下探测器对于成分研究不甚理想,因为它们原本主要是为其它目的而设计的.我们提出一种新的途径:用一个探测器陈列在浅层地下观测多μ事例.这一方法对成分研究具有较高的灵敏度. 相似文献
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用高温高压法合成了Sr1-xEuxTiO3(x=0.0,0.1,0.2,0.3,0.4,0.5)及Ba0.3Eu0.7TiO3化合物.结果表明,所有样品均为立方结构,样品中存在Eu(Ⅱ)和Eu(Ⅲ)的混合价.Eu3+的掺入直接影响了Sr离子与氧离子的结合,使Sr3p3/2的结合能随x的增加而增加. 相似文献
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It is prpopsed that a water Cherenkov detector array, LHAASO-WCDA, is to be built at Shangri-la, Yunnan Province, China. As one of the major components of the LHAASO project, the main purpose of it is to survey the northern sky for gamma ray sources in the energy range of 100 GeV—30 TeV. In order to design the water Cherenkov array efficiently to economize the budget, a Monte Carlo simulation is carried out. With the help of the simulation, the cost performance of different configurations of the array are obtained and compared with each other, serving as a guide for the more detailed design of the experiment in the next step. 相似文献