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arXiv 1802.00660physics.ins-det
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中子辐照后改进的ATLAS像元畸变研究

Investigation of modified ATLAS pixel implantations after irradiation with neutrons

A. Gisen, S. Altenheiner, C. Gößling, M. Grothe, R. Klingenberg, K. Kröninger, J. Lönker, M. Weers, T. Wittig, F. Wizemann

摘要:

ATLAS实验跟踪探测器的最里面部分主要由平面n $^+$ -in-n硅像素传感器组成。在0期升级期间,可插入B层(IBL)安装在最靠近束流管的位置。其像素以具有矩形形状的n个$^+$注入的$250\,μ$ m $\,\times\,50\,μ$ m的间距布置。基于这种设计,多特蒙德开发了改进的像素设计。这些新像素设计中的六个被布置在十列的结构中,并且被放置在一个传感器上的具有标准设计的结构旁边。由于特殊的保护环设计,每个结构都可以单独供电和研究。这些传感器中的几个被凸块键合到FE-I4读出芯片。其中一个模块用反应堆中子辐照,通量高达$5 \times 10^{15} \, n_{\text{eq}}\text{cm}^{-2}$。这一贡献提出了重要的传感器特性,电荷收集确定与放射源和命中效率的测量,在实验室和测试束,这个辐照设备。结果表明,新的修改后的设计执行类似或更好的IBL标准设计的电荷收集和跟踪效率方面,在一个稍微增加的漏电流的成本。

英文摘要:

The innermost part of the tracking detector of the ATLAS experiment consists mainly of planar n$^+$-in-n silicon pixel sensors. During the phase-0 upgrade, the Insertable B-Layer (IBL) was installed closest to the beam pipe. Its pixels are arranged with a pitch of $250\,μ$m$\,\times\,50\,μ$m with a rectangular shaped n$^+$ implantation. Based on this design modified pixel designs have been developed in Dortmund. Six of these new pixel designs are arranged in structures of ten columns and were placed beside structures with the standard design on one sensor. Because of a special guard ring design, each structure can be powered and investigated separately. Several of these sensors were bump bonded to FE-I4 read-out chips. One of these modules was irradiated with reactor neutrons up to a fluence of $5 \times 10^{15} \, n_{\text{eq}}\text{cm}^{-2}$. This contribution presents important sensor characteristics, charge collection determined with radioactive sources and hit efficiency measurements, performed in laboratory and test beam, of this irradiated device. It is shown that the new modified designs perform similar or better than the IBL standard design in terms of charge collection and tracking efficiency, at the cost of a slightly increased leakage current.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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