High spatial coherence and short pulse duration revealed by the Hanbury Brown and Twiss interferometry at the European XFEL.

Pub Date : 2021-08-23 eCollection Date: 2021-07-01 DOI:10.1063/4.0000127

Ruslan Khubbutdinov, Natalia Gerasimova, Giuseppe Mercurio, Dameli Assalauova, Jerome Carnis, Luca Gelisio, Loïc Le Guyader, Alexandr Ignatenko, Young Yong Kim, Benjamin E Van Kuiken, Ruslan P Kurta, Dmitry Lapkin, Martin Teichmann, Alexander Yaroslavtsev, Oleg Gorobtsov, Alexey P Menushenkov, Matthias Scholz, Andreas Scherz, Ivan A Vartanyants

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引用次数: 9

Abstract

Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft x-ray Self-Amplified Spontaneous Emission (SASE3) undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e., linear and quadratic undulator tapering at saturation, were studied in detail and compared with the linear gain regime. The statistical analysis showed an exceptionally high degree of spatial coherence up to 90% for the linear undulator tapering. Analysis of the measured data in spectral and spatial domains provided an average pulse duration of about 10 fs in our measurements. The obtained results will be valuable for the experiments requiring and exploiting short pulse duration and utilizing high coherence properties of the EuXFEL.

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高空间相干性和短脉冲持续时间揭示了汉伯里布朗和Twiss干涉测量在欧洲的XFEL。

采用二阶强度干涉法研究了欧洲x射线自由电子激光器(EuXFEL)的时空特性。在自放大自发发射(SASE)模式下，在光子能量为1.2 keV的软x射线自放大自发发射(SASE3)波束线上进行了测量。详细研究了SASE3波动器设置的两种高功率模式，即线性和二次波动器在饱和时逐渐变细，并与线性增益模式进行了比较。统计分析表明，线性波动锥的空间相干度高达90%。在光谱和空间域的测量数据的分析提供了平均脉冲持续时间约10 fs在我们的测量。所得结果对于需要利用短脉冲持续时间和利用EuXFEL的高相干特性的实验具有一定的参考价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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