THPB027

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URL	https://doi.org/10.18429/JACoW-IPAC2025-THPB027
Title	Novel photoinjector laser providing advanced pulse shaping for FLASH and EuXFEL
Authors	D. Ilia, C. Mahnke, A. Ahmed, O. Akcaalan, B. Beutner, F. Brinker, M. Cai, Y. Chen, W. Decking, Y. Jiang, J. Good, U. Grosse-Wortmann, M. Guetg, N. Kschuev, C. Li, T. Long, C. Mohr, H. Panuganti, F. Pressacco, L. Schaper, S. Schulz, H. Tavakol, S. Tomin, C. Vidoli, M. Vogt, S. Walker, L. Winkelmann, J. Wood, H. Tuennermann, I. Hartl Deutsches Elektronen-Synchrotron DESY N. Ay, A. Klemps Hamburg University of Technology W. Hillert Universität Hamburg
Abstract	We recently commissioned the Next GenerAtion Photocathode Laser system (NEPAL) in Hamburg’s XFEL facilities (FLASH and EuXFEL) and at DESY’s Photoinjector Test Facility (PITZ). The system delivers deep UV pulse trains up to 1 ms long at repetition rates as high as 4.5 MHz, with temporal and spatial shaping capabilities and individual amplitude control for bunch charge manipulation. The shaping features enable the generation of exceptionally low emittance electron beams, essential for extending the EuXFEL X-ray photon energy beyond 25 keV and for future high duty cycle upgrades. Temporal shaping is achieved through a high-resolution spatial light modulator in the near-infrared driver laser, allowing precise spectral amplitude and phase control of UV pulses. We will present advanced control schemes that pre-compensate for laser nonlinearities and initial experimental results at EuXFEL. We generated UV flat-top pulse profiles with durations ranging from 10ps to 20ps and successfully transferred them onto the electron beam. This achievement represents a significant step toward emittance optimization at EuXFEL and will expand the facility's operational energy range in the near future.
Paper	download: THPB027.pdf
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Conference	16th International Particle Accelerator Conference
Series
Location	Taipei, Taiwan
Date	01-06 Jun 2025
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	* Ming-Chyuan Lin - National Synchrotron Radiation Research Center * Yoichi Sato - KEK * Jui-Che Huang - National Synchrotron Radiation Research Center * David Button - Australian Nuclear Science and Technology Organisation * Ping-Shun Chuang - National Synchrotron Radiation Research Center
Online ISBN	978-3-95450-248-6
Online ISSN	2673-5490
Received	10 June 2025
Revised	14 June 2025
Accepted	14 June 2025
Issued	05 November 2025
DOI	10.18429/JACoW-IPAC2025-THPB027
Pages	2564-2567
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.