摘要： We present single-shot measurements of the longitudinal bunch profile from a laser-wakefield accelerator with sub-fs resolution, based on detection of coherent transition radiation in a broad spectral range. A previously developed phase retrieval algorithm enables reconstruction of the bunch profile without prior assumptions about its shape. In this study, a variable-length gas target is used to explore the dynamics of bunch evolution. Our results show that once the laser energy is depleted the time structure of the generated electron beam changes from a single bunch to a double bunch structure, well suited for driver-witness type experiments. 出版者： College Park: American Physical Society (APS) 出版日期： 2015-12-16 出處： Physical Review Special Topics - Accelerators and Beams, 2015-12, Vol.18 (12), p.121302, Article 121302 資源來源： American Physical Society Publications 版權： 2015. This work is licensed under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1098-4402 識別號： EISSN: 1098-4402 識別號： EISSN: 2469-9888 識別號： DOI: 10.1103/physrevstab.18.121302
