This Conceptual Design Report describes LUXE (Laser Und XFEL Experiment), an experimental campaign that aims to combine the high-quality and high-energy electron beam of the European XFEL with a powerful laser to explore the uncharted terrain of quantum electrodynamics characterised by both high energy and high intensity. We will reach this hitherto inaccessible regime of quantum physics by analysing high-energy electron-photon and photon-photon interactions in the extreme environment provided by an intense laser focus. The physics background and its relevance are presented in the science case which in turn leads to, and justifies, the ensuing plan for all aspects of the experiment: Our choice of experimental parameters allows (i) field strengths to be probed where the coupling to charges becomes non-perturbative and (ii) a precision to be achieved that permits a detailed comparison of the measured data with calculations. In addition, the high photon flux predicted will enable a sensitive search for new physics beyond the Standard Model. The initial phase of the experiment will employ an existing 40 TW laser, whereas the second phase will utilise an upgraded laser power of 350 TW. All expectations regarding the performance of the experimental set-up as well as the expected physics results are based on detailed numerical simulations throughout.

这份概念设计报告描述了 LUXE（激光和 XFEL 实验），这是一项实验活动，旨在将欧洲 XFEL 的高质量和高能电子束与强大的激光相结合，探索量子电动力学的未知领域能量和高强度。我们将通过分析强激光聚焦提供的极端环境中的高能电子-光子和光子-光子相互作用来达到迄今为止无法进入的量子物理学领域。物理学背景及其相关性在科学案例中呈现，这反过来又导致并证明了实验各个方面的后续计划：我们对实验参数的选择允许 (i) 在与电荷的耦合变得非微扰的情况下探测场强和 (ii) 实现的精度，允许将测量数据与计算进行详细比较。此外，预测的高光子通量将使人们能够对标准模型之外的新物理进行敏感的搜索。实验的初始阶段将使用现有的 40 TW 激光器，而第二阶段将使用升级后的 350 TW 激光功率。关于实验装置性能的所有期望以及预期的物理结果都基于详细的数值模拟。预测的高光子通量将使人们能够对标准模型之外的新物理进行敏感搜索。实验的初始阶段将使用现有的 40 TW 激光器，而第二阶段将使用升级后的 350 TW 激光功率。关于实验装置性能的所有期望以及预期的物理结果都基于详细的数值模拟。预测的高光子通量将使人们能够对标准模型之外的新物理进行敏感搜索。实验的初始阶段将使用现有的 40 TW 激光器，而第二阶段将使用升级后的 350 TW 激光功率。关于实验装置性能的所有期望以及预期的物理结果都基于详细的数值模拟。