000454856 001__ 454856 000454856 005__ 20211222091524.0 000454856 0247_ $$2INSPIRETeX$$aAbramowicz:2021zja 000454856 0247_ $$2inspire$$ainspire:1844569 000454856 0247_ $$2arXiv$$aarXiv:2102.02032 000454856 0247_ $$2altmetric$$aaltmetric:99362712 000454856 037__ $$aPUBDB-2021-00781 000454856 041__ $$aEnglish 000454856 088__ $$2arXiv$$aarXiv:2102.02032 000454856 088__ $$2DESY$$aDESY-21-016 000454856 082__ $$a796 000454856 1001_ $$0P:(DE-H253)PIP1030369$$aHeinemann, Beate$$b0$$eCorresponding author$$udesy 000454856 245__ $$aConceptual Design Report for the LUXE Experiment 000454856 3367_ $$0PUB:(DE-HGF)25$$2PUB:(DE-HGF)$$aPreprint$$bpreprint$$mpreprint$$s1612776442_558 000454856 3367_ $$2ORCID$$aWORKING_PAPER 000454856 3367_ $$028$$2EndNote$$aElectronic Article 000454856 3367_ $$2DRIVER$$apreprint 000454856 3367_ $$2BibTeX$$aARTICLE 000454856 3367_ $$2DataCite$$aOutput Types/Working Paper 000454856 520__ $$aThis 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) effective field strengths to be probed at and beyond the Schwinger limit 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 300 TW. 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