arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.04640physics.ins-det
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辐照前后25 um间距像素传感器的位置分辨率

Position resolution with 25 um pitch pixel sensors before and after irradiation

I. Zoi, A. Ebrahimi, F. Feindt, E. Garutti, P. Gunnellini, A. Hinzmann, C. Niemeyer, D. Pitzl, J. Schwandt, G. Steinbrück

摘要:

像素化硅探测器是在对撞机实验中实现精确跟踪和顶点的最先进技术,旨在精确测量高速率和辐射环境中入射粒子的命中位置。对于高亮度LHC的操作来说,探测器的要求变得非常苛刻,其中多达200个相互作用将在感兴趣的过程之上的同一束交叉中重叠。此外,对于3000 fb^-1的积分亮度,在离束流3.0 cm处的注量预计可达2.3 × 10^16 cm^-2 1 MeV中子当量。在过去的几十年中,像素间距不断减少,以应付实验的需要,实现更高的位置分辨率和保持低像素占用每通道。空间分辨率随着像素尺寸的减小而提高,但随着辐射损伤而降低。因此,用于HL-LHC实验升级的原型传感器模块需要在辐照后进行测试。本文描述了CMS第2阶段升级中100 × 25 um^2像素平面原型传感器的位置分辨率测量。它回顾的位置分辨率的入射粒子的轨迹和传感器之间的相对倾斜角,由读出芯片施加的电荷阈值,和偏置电压的依赖关系。一个精确的设置与三个平行的平面的传感器已被用来调查的性能的传感器辐照通量高达F_eq = 3.6 10^15 cm-2。测量用5 GeV电子束进行。在电荷共享的最佳角度下,未辐照传感器的空间分辨率为3.2 ± 0.1 μ m。对于质子辐照传感器(F_eq = 2.1 × 10^15 cm ^-2)和中子辐照传感器(F_eq = 3.6 × 10^15 cm^-2),分辨率为5.0 +/- 0.2 um。

英文摘要:

Pixelated silicon detectors are state-of-the-art technology to achieve precise tracking and vertexing at collider experiments, designed to accurately measure the hit position of incoming particles in high rate and radiation environments. The detector requirements become extremely demanding for operation at the High-Luminosity LHC, where up to 200 interactions will overlap in the same bunch crossing on top of the process of interest. Additionally, fluences up to 2.3 10^16 cm^-2 1 MeV neutron equivalent at 3.0 cm distance from the beam are expected for an integrated luminosity of 3000 fb^-1. In the last decades, the pixel pitch has constantly been reduced to cope with the experiment's needs of achieving higher position resolution and maintaining low pixel occupancy per channel. The spatial resolution improves with a decreased pixel size but it degrades with radiation damage. Therefore, prototype sensor modules for the upgrade of the experiments at the HL-LHC need to be tested after being irradiated. This paper describes position resolution measurements on planar prototype sensors with 100x25 um^2 pixels for the CMS Phase-2 Upgrade. It reviews the dependence of the position resolution on the relative inclination angle between the incoming particle trajectory and the sensor, the charge threshold applied by the readout chip, and the bias voltage. A precision setup with three parallel planes of sensors has been used to investigate the performance of sensors irradiated to fluences up to F_eq = 3.6 10^15 cm-2. The measurements were performed with a 5 GeV electron beam. A spatial resolution of 3.2 +\- 0.1 um is found for non-irradiated sensors, at the optimal angle for charge sharing. The resolution is 5.0 +/- 0.2 um for a proton-irradiated sensor at F_eq = 2.1 10^15 cm-2 and a neutron-irradiated sensor at F_eq = 3.6 10^15 cm^-2.

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