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DOE OSTI · 3365015

Single-Shot Reconstruction of Electron Beam Longitudinal Phase Space in a Laser Wakefield Accelerator

Ma, Y. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:0000000239194856)·Streeter, M. J. V. [Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom); Queen's Univ., Belfast, Northern Ireland (United Kingdom)] (ORCID:0000000190869831)·Albert, Felicie [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]·Bourgeois, N. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)]·Cipiccia, S. [Univ. College London (United Kingdom); Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.] (ORCID:0000000234852856)·Cole, J. M. [Imperial College, London (United Kingdom)] (ORCID:0000000165580788)·Dann, S. J. D. [Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:000000026875631X)·Falk, K. [Helmholtz-Zentrum Dresden-Rossendorf (Germany); Technische Univ. Dresden (Germany); Czech Academy of Sciences (CAS), Prague (Czech Republic). Institute of Physics]·Gerstmayr, E. [Imperial College, London (United Kingdom); Queen's Univ., Belfast, Northern Ireland (United Kingdom)] (ORCID:0000000311648593)·Gallardo González, I. [Lund Univ. (Sweden)] (ORCID:0000000313900262)·Higginbotham, A. [Univ. of York (United Kingdom)]·Hussein, A. E. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000196764862)·Jaroszynski, D. A. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)] (ORCID:0000000230065492)·Joglekar, A. S. [Ergodic LLC, San Francisco, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)]·Kettle, B. [Imperial College, London (United Kingdom)] (ORCID:0000000344244448)·Krushelnick, K. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000191169511)·Lemos, N. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000267815672)·Lopes, N. C. [Imperial College, London (United Kingdom); Univ. of Lisbon (Portugal). Inst. Superior Técnico]·Lumsden, C. [Univ. of York (United Kingdom)]·Lundh, O. [Lund Univ. (Sweden)] (ORCID:0000000309078982)·Mangles, S. P. D. [Imperial College, London (United Kingdom)] (ORCID:0000000324434201)·Miller, K. G. [Univ. of California, Los Angeles, CA (United States)] (ORCID:0000000348269001)·Mori, W. [Univ. of California, Los Angeles, CA (United States)]·Najmudin, Z. [Imperial College, London (United Kingdom)] (ORCID:0000000163234005)·Qian, Q. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:000000016955769X)·Rajeev, P. P. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)] (ORCID:0000000273750000)·Seipt, D. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom); Helmholtz Inst. Jena (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)] (ORCID:0000000336950051)·Shahzad, M. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)]·Šmíd, M. [Helmholtz-Zentrum Dresden-Rossendorf (Germany)] (ORCID:0000000271627500)·Spesyvtsev, R. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)]·Symes, D. R. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)] (ORCID:0000000334439209)·Vieux, G. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)]·Willingale, L. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United States); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:0000000343040339)·Wood, J. C. [Imperial College, London (United Kingdom)] (ORCID:0000000344137044)·Thomas, A. G. R. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:0000000332068512)
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Abstract

We report on a single-shot longitudinal phase-space reconstruction diagnostic for electron beams in a laser wakefield accelerator via the experimental observation of distinct periodic modulations in the angularly resolved spectra. Such modulated angular spectra arise as a result of the direct interaction between the ultrarelativistic electron beam and the laser driver in the presence of the wakefield. A constrained theoretical model for the coupled oscillator, assisted by a genetic algorithm, can recreate the experimental electron spectra and, thus, fully reconstructs the longitudinal phase-space distribution of the electron beam with a temporal resolution of approximately 1.3 fs. In particular, it reveals the slice energy spread of the electron beam, which is important to measure for applications such as x-ray free electron lasers. In our experiment, the root-mean-square energy spread retrieved is bounded at 9.9 MeV, corresponding to a 0.9%–3.0% relative spread, despite the overall GeV energy beam having approximately 100% relative energy spread.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGYPhysics - Plasma physicsbeam diagnosticslaser wakefield accelerationlaser-plasma interactionsparticle-in-cell methodsplasma-beam interactions

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Ma, Y. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:0000000239194856), Streeter, M. J. V. [Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom); Queen's Univ., Belfast, Northern Ireland (United Kingdom)] (ORCID:0000000190869831), Albert, Felicie [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)], Bourgeois, N. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)], Cipiccia, S. [Univ. College London (United Kingdom); Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.] (ORCID:0000000234852856), Cole, J. M. [Imperial College, London (United Kingdom)] (ORCID:0000000165580788), Dann, S. J. D. [Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:000000026875631X), Falk, K. [Helmholtz-Zentrum Dresden-Rossendorf (Germany); Technische Univ. Dresden (Germany); Czech Academy of Sciences (CAS), Prague (Czech Republic). Institute of Physics], Gerstmayr, E. [Imperial College, London (United Kingdom); Queen's Univ., Belfast, Northern Ireland (United Kingdom)] (ORCID:0000000311648593), Gallardo González, I. [Lund Univ. (Sweden)] (ORCID:0000000313900262), Higginbotham, A. [Univ. of York (United Kingdom)], Hussein, A. E. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000196764862), Jaroszynski, D. A. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)] (ORCID:0000000230065492), Joglekar, A. S. [Ergodic LLC, San Francisco, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)], Kettle, B. [Imperial College, London (United Kingdom)] (ORCID:0000000344244448), Krushelnick, K. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000191169511), Lemos, N. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000267815672), Lopes, N. C. [Imperial College, London (United Kingdom); Univ. of Lisbon (Portugal). Inst. Superior Técnico], Lumsden, C. [Univ. of York (United Kingdom)], Lundh, O. [Lund Univ. (Sweden)] (ORCID:0000000309078982), Mangles, S. P. D. [Imperial College, London (United Kingdom)] (ORCID:0000000324434201), Miller, K. G. [Univ. of California, Los Angeles, CA (United States)] (ORCID:0000000348269001), Mori, W. [Univ. of California, Los Angeles, CA (United States)], Najmudin, Z. [Imperial College, London (United Kingdom)] (ORCID:0000000163234005), Qian, Q. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:000000016955769X), Rajeev, P. P. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)] (ORCID:0000000273750000), Seipt, D. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom); Helmholtz Inst. Jena (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)] (ORCID:0000000336950051), Shahzad, M. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)], Šmíd, M. [Helmholtz-Zentrum Dresden-Rossendorf (Germany)] (ORCID:0000000271627500), Spesyvtsev, R. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)], Symes, D. R. [Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)] (ORCID:0000000334439209), Vieux, G. [Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)], Willingale, L. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United States); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:0000000343040339), Wood, J. C. [Imperial College, London (United Kingdom)] (ORCID:0000000344137044), Thomas, A. G. R. [Univ. of Michigan, Ann Arbor, MI (United States); Cockcroft Inst. (United Kingdom); Lancaster Univ., Bailrigg (United Kingdom)] (ORCID:0000000332068512). 2025-09-02. Single-Shot Reconstruction of Electron Beam Longitudinal Phase Space in a Laser Wakefield Accelerator. https://doi.org/10.1103/sxqf-l6mp

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