000618862 001__ 618862 000618862 005__ 20250801212035.0 000618862 0247_ $$2doi$$a10.1038/s41586-025-08772-y 000618862 0247_ $$2ISSN$$a0028-0836 000618862 0247_ $$2ISSN$$a1476-4687 000618862 0247_ $$2datacite_doi$$a10.3204/PUBDB-2024-07200 000618862 0247_ $$2altmetric$$aaltmetric:175978121 000618862 0247_ $$2pmid$$apmid:40205057 000618862 0247_ $$2WOS$$aWOS:001462551500001 000618862 0247_ $$2openalex$$aopenalex:W4409283690 000618862 037__ $$aPUBDB-2024-07200 000618862 041__ $$aEnglish 000618862 082__ $$a500 000618862 1001_ $$0P:(DE-H253)PIP1016482$$aWinkler, Paul Viktor$$b0$$eCorresponding author 000618862 245__ $$aActive Energy Compression of a Laser-Plasma Electron Beam 000618862 260__ $$aLondon [u.a.]$$bNature Publ. Group$$c2025 000618862 3367_ $$2DRIVER$$aarticle 000618862 3367_ $$2DataCite$$aOutput Types/Journal article 000618862 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1754052781_3349144 000618862 3367_ $$2BibTeX$$aARTICLE 000618862 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000618862 3367_ $$00$$2EndNote$$aJournal Article 000618862 520__ $$aRadio-frequency (RF) accelerators providing high-quality relativistic electron beams are an important resource enabling many areas of science, as well as industrial and medical applications. Two decades ago, laser-plasma accelerators1 that support orders of magnitude higher electric fields than those provided by modern RF cavities produced quasi-monoenergetic electron beams for the first time2,3,4. Since then, high-brightness electron beams at gigaelectronvolt (GeV) beam energy and competitive beam properties have been demonstrated from only centimetre-long plasmas5,6,7,8,9, a substantial advantage over the hundreds of metres required by RF-cavity-based accelerators. However, despite the considerable progress, the comparably large energy spread and the fluctuation (jitter) in beam energy still effectively prevent laser-plasma accelerators from driving real-world applications. Here we report the generation of a laser-plasma electron beam using active energy compression, resulting in a performance so far only associated with modern RF-based accelerators. Using a magnetic chicane, the electron bunch is first stretched longitudinally to imprint an energy correlation, which is then removed with an active RF cavity. The resulting energy spread and energy jitter are reduced by more than an order of magnitude to below the permille level, meeting the acceptance criteria of a modern synchrotron, thereby opening the path to a compact storage ring injector and other applications. 000618862 536__ $$0G:(DE-HGF)POF4-621$$a621 - Accelerator Research and Development (POF4-621)$$cPOF4-621$$fPOF IV$$x0 000618862 588__ $$aDataset connected to CrossRef, Journals: bib-pubdb1.desy.de 000618862 693__ $$0EXP:(DE-H253)KALDERA-20221201$$5EXP:(DE-H253)KALDERA-20221201$$eKilowatt Average Power Laser at DESY for Revolutionary Accelerators$$x0 000618862 7001_ $$0P:(DE-H253)PIP1018499$$aTrunk, Maximilian$$b1$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1023364$$aHuebner, Lars$$b2$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1006726$$aMartinez de la Ossa, Alberto$$b3$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1027758$$aJalas, Soeren$$b4 000618862 7001_ $$0P:(DE-H253)PIP1021382$$aKirchen, Manuel$$b5$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1011647$$aAgapov, Ilya$$b6 000618862 7001_ $$0P:(DE-H253)PIP1093074$$aAntipov, Sergey$$b7 000618862 7001_ $$0P:(DE-H253)PIP1002844$$aBrinkmann, Reinhard$$b8 000618862 7001_ $$0P:(DE-H253)PIP1024414$$aEichner, Timo$$b9 000618862 7001_ $$0P:(DE-H253)PIP1028679$$aFerran Pousa, Angel$$b10 000618862 7001_ $$0P:(DE-H253)PIP1028488$$aHülsenbusch, Thomas$$b11 000618862 7001_ $$0P:(DE-H253)PIP1018839$$aPalmer, Guido$$b12$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1014001$$aSchnepp, Matthias$$b13 000618862 7001_ $$0P:(DE-H253)PIP1021880$$aSchubert, Kaja$$b14$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1093740$$aThévenet, Maxence$$b15 000618862 7001_ $$0P:(DE-H253)PIP1020737$$aWalker, Paul Andreas$$b16 000618862 7001_ $$0P:(DE-H253)PIP1017053$$aWerle, Christian$$b17$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1087150$$aLeemans, Wim$$b18$$udesy 000618862 7001_ $$0P:(DE-H253)PIP1014692$$aMaier, Andreas$$b19$$eCorresponding author$$udesy 000618862 773__ $$0PERI:(DE-600)1413423-8$$a10.1038/s41586-025-08772-y$$gVol. 640, no. 8060, p. 907 - 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