Preprint Communication Version 1 Preserved in Portico This version is not peer-reviewed

Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper

Evgeny Schneidmiller
* ORCID logo ,
Matthias Dreimann
,
Marion Kuhlmann
,
Juliane Roensch-Schulenburg
ORCID logo ,
Helmut Zacharias
Version 1 : Received: 29 April 2023 / Approved: 30 April 2023 / Online: 30 April 2023 (04:45:05 CEST)

A peer-reviewed article of this Preprint also exists.

Schneidmiller, E.; Dreimann, M.; Kuhlmann, M.; Rönsch-Schulenburg, J.; Zacharias, H. Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper. Photonics 2023, 10, 653. Schneidmiller, E.; Dreimann, M.; Kuhlmann, M.; Rönsch-Schulenburg, J.; Zacharias, H. Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper. Photonics 2023, 10, 653.

Abstract

The pulse duration in short-pulse schemes for Self-Amplified Spontaneous Emission Free Electron Lasers (SASE FELs) is limited by the FEL coherence time. A recently proposed concept allows to overcome the coherence time barrier and to get much shorter pulses. When the lasing part of an electron bunch is much shorter than the coherence time, one can suppress the radiation in the long main undulator while preserving microbunching within that short lasing slice. Then a short radiation pulse is produced in a relatively short radiator. A possible suppression method, an excessive reverse undulator taper, is discussed and illustrated numerically in this paper. We also performed first experimental tests of this method at the soft X-ray FEL user facility FLASH. The measured pulse duration approaches 1 fs (FWHM) at the wavelength of 5 nm.

Keywords

Free Electron Laser; SASE FEL; X-Ray FEL; Ultrashort pulses

Subject

Physical Sciences, Optics and Photonics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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