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A high-harmonic generation source for seeding a free-electron laser at 38 nm

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Abstract

Direct seeding with a high-harmonic generation (HHG) source can improve the spectral, temporal, and coherence properties of a free-electron laser (FEL) and shall reduce intensity and arrival-time fluctuations. In the seeding experiment sFLASH at the extreme ultraviolet FEL in Hamburg FLASH, which operates in the self-amplified spontaneous emission mode (SASE), the 21st harmonic of an 800 nm laser is refocused into a dedicated seeding undulator. For seeding, the external light field has to overcome the noise level of SASE; therefore, an efficient coupling between seed pulse and electron bunch is mandatory. Thus, an HHG beam with a proper divergence, width, beam quality, Rayleigh length, pointing stability, single-shot pulse energy, and stability in the 21st harmonic is needed. Here, we present the setup of the HHG source that seeds sFLASH at 38.1 nm, the optimization procedures, and the necessary diagnostics.

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Acknowledgments

The authors thank DESY and the FLASH team for the opportunity to perform the seeding experiment. All co-workers in the sFLASH team are gratefully acknowledged for helpful discussions and suggestions. The mechanical workshops of the University of Hamburg and DESY, as well as Oliver Becker, are acknowledged for technical support. We are financially supported by the Federal Ministry of Education and Research of Germany within FSP-301 under FKZ 05K10GU1, the German Research Foundation within GrK 1355, and SFB 925.

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Authors and Affiliations

  1. Department of Physics, University of Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany

    Theophilos Maltezopoulos, Manuel Mittenzwey, Armin Azima, Jörn Bödewadt, Marie Rehders, Christoph Lechner, Michael Schulz, Marek Wieland, Jörg Roßbach & Markus Drescher

  2. Center for Free-Electron-Laser-Science (CFEL), Luruper Chaussee 149, 22761, Hamburg, Germany

    Theophilos Maltezopoulos, Marie Rehders, Jörg Roßbach & Markus Drescher

  3. Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607, Hamburg, Germany

    Hatem Dachraoui, Michael Schulz & Tim Laarmann

  4. The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761, Hamburg, Germany

    Tim Laarmann & Markus Drescher

Authors
  1. Theophilos Maltezopoulos
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  2. Manuel Mittenzwey
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  3. Armin Azima
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  4. Jörn Bödewadt
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  5. Hatem Dachraoui
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  6. Marie Rehders
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  7. Christoph Lechner
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  8. Michael Schulz
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  9. Marek Wieland
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  10. Tim Laarmann
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  12. Markus Drescher
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Correspondence to Theophilos Maltezopoulos.

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Maltezopoulos, T., Mittenzwey, M., Azima, A. et al. A high-harmonic generation source for seeding a free-electron laser at 38 nm. Appl. Phys. B 115, 45–54 (2014). https://doi.org/10.1007/s00340-013-5571-6

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  • DOI: https://doi.org/10.1007/s00340-013-5571-6

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