Journal Article

PUBDB-2026-01341

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png U-Net-based surrogate modeling for attosecond X-ray free-electron lasers

Wei, Y. ; Yan, B. ; Xu, C.XFEL.EU*DESY* ; Yan, J. (Corresponding author)DESY* ; Deng, H. (Corresponding author)

2026
Springer Heidelberg

This record in other databases:    

Please use a persistent id in citations: doi:10.1140/epjd/s10053-026-01163-6

Report No.: arXiv:2601.10898

Abstract: Attosecond X-ray pulse generation in modern X-ray free-electron lasers relies on strongly compressed, precisely tailored electron bunches, making accurate diagnostics and control of the two-dimensional longitudinal phase space (LPS) essential. In the self-chirping scheme, collective effects in the linac generate a strong energy chirp that is converted into high peak current through pre-undulator compression, enabling isolated attosecond pulse generation. Reliable operation of this scheme depends on precise two-dimensional LPS control and fast diagnostics. In this work, we present a U-Net-based neural-network surrogate that predicts two-dimensional LPS distributions directly from accelerator settings. The model exhibits good agreement with start-to-end simulation results. These results demonstrate the potential of neural-network surrogates to facilitate fast virtual diagnostics and provide a step toward real-time tuning in attosecond XFEL operation.

Keyword(s): Accelerator Physics (physics.acc-ph) ; FOS: Physical sciences

Note: Waiting for fulltext

---

Contributing Institute(s):

1. XFEL (MXL)
2. FEL Physics (XFEL_E2_FP)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. 6G13 - Accelerator of European XFEL (POF4-6G13) (POF4-6G13)

Experiment(s):

1. Facility (machine) XFEL

Appears in the scientific report 2026

---

Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Springer ; DEAL Springer ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Wei, Y. ; Yan, B. ; Xu, C. ; Yan, J. (Corresponding author)DESY* ; Deng, H. (Corresponding author)
U-Net-based surrogate modeling for attosecond X-ray free-electron lasers
(2026)2026     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---