Journal Article

PUBDB-2024-00136

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A phenomenological model of the X-ray pulse statistics of a high-repetition-rate X-ray free-electron laser

Guest, T. W. (Corresponding author)XFEL.EU* ; Bean, R.XFEL.EU* ; Kammering, R.XFEL.EU*DESY* ; van Riessen, G.Extern* ; Mancuso, A.Extern*XFEL.EU* ; Abbey, B. (Corresponding author)Extern*

2023
International Union of Crystallography Chester

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Please use a persistent id in citations: doi:10.1107/S2052252523008242  doi:10.3204/PUBDB-2024-00136

Abstract: Many coherent imaging applications that utilize ultrafast X-ray free-electron laser (XFEL) radiation pulses are highly sensitive to fluctuations in the shot-to-shot statistical properties of the source. Understanding and modelling these fluctuations are key to successful experiment planning and necessary to maximize the potential of XFEL facilities. Current models of XFEL radiation and their shot-to-shot statistics are based on theoretical descriptions of the source and are limited in their ability to capture the shot-to-shot intensity fluctuations observed experimentally. The lack of accurate temporal statistics in simulations that utilize these models is a significant barrier to optimizing and interpreting data from XFEL coherent diffraction experiments. Presented here is a phenomenological model of XFEL radiation that is capable of capturing the shot-to-shot statistics observed experimentally using a simple time-dependent approximation of the pulse wavefront. The model is applied to reproduce non-stationary shot-to-shot intensity fluctuations observed at the European XFEL, whilst accurately representing the single-shot properties predicted by FEL theory. Compared with previous models, this approach provides a simple, robust and computationally inexpensive method of generating statistical representations of XFEL radiation.

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Contributing Institute(s):

1. Control-System (MCS)
2. XFEL Project Group by DESY (XFEL ; XFEL-Project)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. MHz-TOMOSCOPY - MHz rate mulTiple prOjection X-ray MicrOSCOPY (101046448) (101046448)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2023

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