2026-10-11T23:27:11Z https://www.scidb.cn/oai

10.57760/sciencedb.32231 2026-04-03T14:14:12Z

2026-04-03 Pulse-duration dependence of electron acceleration and betatron radiation in tightly focused laser wakefield acceleration doi:10.57760/sciencedb.32231 en Betatron X-ray sources generated via laser wakefield acceleration (LWFA) hold strong potential for diverse applications. Recent progress in tightly focused, high-intensity LWFA has enabled high-charge electron bunches and enhanced betatron radiation. Systematic experimental scans of the laser pulse duration FWHM, a key control parameter for both acceleration and radiation, remain challenging, motivating particle-in-cell simulations. Accordingly, we simulate tightly focused laser pulses propagating in underdense plasma and show that FWHM governs transitions between distinct interaction regimes. An optimal duration range of 20–40 fs is identified, where direct laser acceleration contributes substantially and the conversion efficiencies from laser energy to electron energy and to X-ray energy are simultaneously maximized, reaching 70% and 0.4%, respectively, at ∼ 1 PW. Betatron X-ray; laser wakefield acceleration; laser pulse duration Jianmeng Wei Jia Wang Song Li Hong Zhang Hang Guo Gaojie Zeng Kangnan Jiang Hao Wang Shixia Luan Ke Feng Wentao Wang Yuxin Leng Ruxin Li PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank