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自放大自发辐射自由电子激光脉冲的维格纳分布及其自相关提取

Wigner distribution of self-amplified spontaneous emission free-electron laser pulses and extracting its autocorrelation.

作者信息

Serkez Svitozar, Gorobtsov Oleg, Rivas Daniel E, Meyer Michael, Sobko Bohdana, Gerasimova Natalia, Kujala Naresh, Geloni Gianluca

机构信息

European XFEL, Hamburg, Germany.

Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany.

出版信息

J Synchrotron Radiat. 2021 Jan 1;28(Pt 1):3-17. doi: 10.1107/S160057752001382X.

DOI:10.1107/S160057752001382X
PMID:33399547
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7842223/
Abstract

The emerging concept of beam by design' in free-electron laser (FEL) accelerator physics aims for accurate manipulation of the electron beam to tailor spectral and temporal properties of the radiation for specific experimental purposes, such as X-ray pump/X-ray probe and multiple wavelength experiments. Beam by design' requires fast, efficient, and detailed feedback on the spectral and temporal properties of the generated X-ray radiation. Here a simple and cost-efficient method to extract information on the longitudinal Wigner distribution function of emitted FEL pulses is proposed. The method requires only an ensemble of measured FEL spectra and is rather robust with respect to accelerator fluctuations. The method is applied to both the simulated SASE spectra with known radiation properties as well as to the SASE spectra measured at the European XFEL revealing underlying non-linear chirp of the generated radiation. In the Appendices an intuitive understanding of time-frequency representations of chirped SASE radiation is provided.

摘要

自由电子激光（FEL）加速器物理中“设计光束”这一新兴概念旨在精确操控电子束，以便为特定实验目的（如X射线泵浦/X射线探测和多波长实验）调整辐射的光谱和时间特性。“设计光束”需要对所产生的X射线辐射的光谱和时间特性进行快速、高效且详细的反馈。本文提出了一种简单且经济高效的方法，用于提取有关发射的FEL脉冲纵向维格纳分布函数的信息。该方法仅需要一组测量得到的FEL光谱，并且对于加速器波动具有较强的鲁棒性。该方法既应用于具有已知辐射特性的模拟自放大自发辐射（SASE）光谱，也应用于在欧洲XFEL测得的SASE光谱，揭示了所产生辐射潜在的非线性啁啾。附录中提供了对啁啾SASE辐射的时频表示的直观理解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/4a2a353ffcd8/s-28-00003-fig18.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/efeb68e5cb8e/s-28-00003-fig1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/bcfe4de6f1d8/s-28-00003-fig17.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/4a2a353ffcd8/s-28-00003-fig18.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/efeb68e5cb8e/s-28-00003-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/6a118acd6c5b/s-28-00003-fig2.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/0a8b9e678a73/s-28-00003-fig5.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/33bc98bc94f1/s-28-00003-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/2c188f4e6843/s-28-00003-fig8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/d254a3555454/s-28-00003-fig9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/929c26bcc1c7/s-28-00003-fig10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/b13e48a780a8/s-28-00003-fig11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/c8577c0124b3/s-28-00003-fig12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/68e2e6f272a7/s-28-00003-fig13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/7b1f0ab6e708/s-28-00003-fig14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/a4dfde70f7f8/s-28-00003-fig15.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/bcfe4de6f1d8/s-28-00003-fig17.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/58fb/7842223/4a2a353ffcd8/s-28-00003-fig18.jpg

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