{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"Research Square"}],"indexed":{"date-parts":[[2025,12,24]],"date-time":"2025-12-24T00:27:15Z","timestamp":1766536035425,"version":"3.48.0"},"posted":{"date-parts":[[2025,10,15]]},"group-title":"In Review","reference-count":0,"publisher":"Springer Science and Business Media LLC","license":[{"start":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T00:00:00Z","timestamp":1760486400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2025,9,8]]},"abstract":"<title>Abstract<\/title>\n                <p>A compact source of high-energy femtosecond photons stands as a transformative tool across diverse fields, attainable through betatron radiation generated in the laser wakefield acceleration process. The concurrent pursuit of photon energy and flux confronts a critical challenge, arising from the intrinsic discrepancy between the acceleration and radiation processes. To address this, we demonstrate a hybrid betatron scheme, driven by multi-petawatt laser pulses, using a two-stage gas medium to decouple acceleration from radiation. A low-density medium enables efficient acceleration, followed by a high-density plasma that markedly enhances betatron flux and photon energy. It yields gamma-ray pulses with a brilliance of ~5\u00d710\u00b2\u2074 photons\u2219s\u207b\u00b9\u2219mm\u207b\u00b2\u2219mrad\u207b\u00b2\u22190.1%-BW at 180 keV, applied to radiography of a complex metallic structure. Particle-in-cell simulations confirm that the dense radiator stage efficiently converts high-energy electrons into high-brightness gamma rays. These results establish a simple, scalable route to compact, ultrabright betatron gamma-ray sources, opening new opportunities in photon-driven science and technology.<\/p>","DOI":"10.21203\/rs.3.rs-7559872\/v1","type":"posted-content","created":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T05:51:27Z","timestamp":1760507487000},"source":"Crossref","is-referenced-by-count":0,"title":["Enhanced gamma-ray betatron radiation from laser accelerator and plasma radiator"],"prefix":"10.21203","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6050-2374","authenticated-orcid":false,"given":"Hyung Taek","family":"Kim","sequence":"first","affiliation":[{"name":"Gwangju Institute of Science and Technology & Institute for Basic Science"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9498-2759","authenticated-orcid":false,"given":"Mohammad","family":"Mirzaie","sequence":"additional","affiliation":[{"name":"Center for Relativistic Laser Science, Institute for Basic Science"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4363-9624","authenticated-orcid":false,"given":"Ki Hong","family":"Pae","sequence":"additional","affiliation":[{"name":"Gwangju Institute of Science and Technology & Institute for Basic Science"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4320-7584","authenticated-orcid":false,"given":"Calin","family":"Hojbota","sequence":"additional","affiliation":[{"name":"University of Texas at Austin"}]},{"given":"Slava","family":"Smartsev","sequence":"additional","affiliation":[{"name":"Weizmann Institute of Science"}]},{"given":"Sheroy","family":"Tata","sequence":"additional","affiliation":[{"name":"Weizmann Institute of Science"}]},{"given":"Kim","family":"Doyeon","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4193-7556","authenticated-orcid":false,"given":"Vishwa","family":"Pathak","sequence":"additional","affiliation":[{"name":"Vellore Institute of Technology  Vellore"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3016-8376","authenticated-orcid":false,"given":"Yong Joo","family":"Rhee","sequence":"additional","affiliation":[{"name":"Institute for Basic Science"}]},{"given":"Leejin","family":"Bae","sequence":"additional","affiliation":[{"name":"Gwangju Institute of Science and Technology & Institute for Basic Science"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5645-4894","authenticated-orcid":false,"given":"Jae Hee","family":"Sung","sequence":"additional","affiliation":[{"name":"Gwangju Institute of Science and Technology"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9220-0402","authenticated-orcid":false,"given":"Jin Woo","family":"Yoon","sequence":"additional","affiliation":[{"name":"Advanced Photonics Research Institute, GIST"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1459-6066","authenticated-orcid":false,"given":"Seong Ku","family":"Lee","sequence":"additional","affiliation":[{"name":"Gwangju Institute of Science and Technology"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4266-4062","authenticated-orcid":false,"given":"Tae Gyu","family":"Pak","sequence":"additional","affiliation":[{"name":"Institute for Basic Science"}]},{"given":"Jong Ho","family":"JEON","sequence":"additional","affiliation":[{"name":"Center for Relativistic Laser Science, Institute for Basic Science"}]},{"given":"Seong Ha","family":"Cho","sequence":"additional","affiliation":[{"name":"Center for Relativistic Laser Science, Institute for Basic Science"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8203-0702","authenticated-orcid":false,"given":"Chang Hee","family":"Nam","sequence":"additional","affiliation":[{"name":"Center for Relativistic Laser Science, Institute for Basic Science"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0488-2587","authenticated-orcid":false,"given":"Victor","family":"Malka","sequence":"additional","affiliation":[{"name":"Weizmann Institute of Science"}]}],"member":"297","container-title":[],"original-title":[],"link":[{"URL":"https:\/\/www.researchsquare.com\/article\/rs-7559872\/v1","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.researchsquare.com\/article\/rs-7559872\/v1.html","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,24]],"date-time":"2025-12-24T00:25:43Z","timestamp":1766535943000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.researchsquare.com\/article\/rs-7559872\/v1"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,10,15]]},"references-count":0,"URL":"https:\/\/doi.org\/10.21203\/rs.3.rs-7559872\/v1","relation":{},"subject":[],"published":{"date-parts":[[2025,10,15]]},"subtype":"preprint"}}