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通过在CERN的PSS中多重散射正电子来测量ATLAS ITk像素探测器材料
Simon Florian Koch1, Brian Moser1,2, Antonín Lindner2
1Department of Physics, Oxford University, Oxford, UK.
The European physical journal. C, Particles and fields
|April 7, 2025
概括
研究人员使用低能质子测量了ATLAS ITk像素模块的材料预算. 这些关键数据有助于优化内部追踪器 (ITk) 进行高亮度LHC升级.
科学领域:
- 高能粒子物理学 高能粒子物理学
- 探测器仪器仪表仪表的检测器仪表.
背景情况:
- 大强子对撞机上的ATLAS实验需要对高亮度LHC进行升级.
- 内部追踪器 (ITk) 是一个新的追踪器,旨在满足这些需求.
- 准确的材料预算测量对于ITk性能至关重要.
研究的目的:
- 介绍ATLAS ITk像素模块材料预算的第一个直接测量.
- 为了验证ITk像素模块的设计和材料组成.
主要方法:
- 在CERN的质子同步子中使用了测试束.
- 采用了四平面望远镜的单体像素探测器.
- 在ITk像素模块中测量了低能正电子的多重散射.
主要成果:
- 从粒子轨迹中提取了扭曲角度分布.
- 确定了平方根均值 (RMS) 的散射角度.
- 转换散射角度为分数辐射长度 ().
- 测量的平均值作为.
结论:
- 的测量材料预算与基于组件预期的估计结果一致.
- 这种直接测量验证了ATLAS ITk像素模块的材料组成.
- 这些发现支持ITk为高亮度LHC的准备.
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