• Open Access

Cavity based x-ray free electron laser demonstrator at the European X-ray Free Electron Laser facility

Patrick Rauer, Winfried Decking, Dirk Lipka, Daniel Thoden, Torsten Wohlenberg, Immo Bahns, Ulf Brueggmann, Sara Casalbuoni, Massimiliano Di Felice, Martin Dommach, Jan Grünert, Suren Karabekyan, Andreas Koch, Daniele La Civita, Benoit Rio, Liubov Samoylova, Harald Sinn, Maurizio Vannoni, Christopher Youngman, Wolfgang Hillert, and Jörg Rossbach
Phys. Rev. Accel. Beams 26, 020701 – Published 21 February 2023

Abstract

In this article, the concept of a recently funded R&D project for the installation of a proof-of-concept cavity-based x-ray free electron laser (CBXFEL) demonstrator experiment at the European XFEL facility is presented, with the first results expected in 2024. It is composed of an x-ray cavity design in backscattering geometry with a 133 m round trip length using cryogenically cooled diamond crystals. It employs the concept of retroreflection to reduce the sensitivity to vibrations. The FEL radiation is produced in four undulator segments of 20 m total length. Simulations at 16 GeV beam energy and 250 pC bunch charge show that the expected x-ray pulses in saturation surpass state-of-the-art x-ray sources considering spectral flux and three-dimensional coherence. However, the stability of the proof of concept setup is severely challenged by the finite thermal transport in the diamond crystals. Therefore, suitable measures such as cooling the crystals to 70 K are explained in this paper and additional ones will have to be developed in the course of this project.

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  • Received 26 October 2022
  • Accepted 18 January 2023

DOI:https://doi.org/10.1103/PhysRevAccelBeams.26.020701

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Accelerators & Beams

Authors & Affiliations

Patrick Rauer*, Winfried Decking, Dirk Lipka, Daniel Thoden, and Torsten Wohlenberg

  • Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany

Immo Bahns, Ulf Brueggmann, Sara Casalbuoni, Massimiliano Di Felice, Martin Dommach, Jan Grünert, Suren Karabekyan, Andreas Koch, Daniele La Civita, Benoit Rio, Liubov Samoylova, Harald Sinn, Maurizio Vannoni, and Christopher Youngman

  • European XFEL GmbH, Holzkoppel 4, 22689 Schenefeld, Germany

Wolfgang Hillert and Jörg Rossbach

  • Universität Hamburg, Mittelweg 177, 20148 Hamburg, Germany

  • *patrick.rauer@desy.de

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Issue

Vol. 26, Iss. 2 — February 2023

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