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@inproceedings{li:ipac2021-wepab379,
author = {C. Li and O. Akcaalan and M. Frede and U. Grosse-Wortmann and I. Hartl and C. Mohr and O. Puncken and M. Seidel and H. Tuennermann and C. Vidoli and L. Winkelmann},
% author = {C. Li and O. Akcaalan and M. Frede and U. Grosse-Wortmann and I. Hartl and C. Mohr and others},
% author = {C. Li and others},
title = {{Photocathode Laser Development for Superconducting X-Ray Free Electron Lasers at DESY}},
booktitle = {Proc. IPAC'21},
pages = {3599--3601},
eid = {WEPAB379},
language = {english},
keywords = {laser, FEL, operation, cathode, electron},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-WEPAB379},
url = {https://jacow.org/ipac2021/papers/wepab379.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-WEPAB379},
abstract = {{Modern X-Ray Free-Electron Lasers (XFEL) are a key tool to enable a variety of scientific research. Those large-scale machines rely on robust and reliable deep ultraviolet (DUV) laser sources to drive electrons from their RF photocathode gun. In this paper we present a new photocathode laser prototype, which offers more flexibility in duration and shape of the 257.5 nm pulses for driving the CsTe Photocathodes of DESY’s superconducting burst-mode FELs. The laser matches the FEL pulse structure, which are 800 µs bursts at up to 4.5 MHz intraburst-rate with 10 Hz burst-repetition-rate. In a first version the system will offer variable DUV pulse durations, tunable from 1 ps to 20 ps to address different operational regimes of the XFEL. The laser system comprises a high-resolution spectral shaper with the option of generating flat-top DUV pulses for reducing electron-beam emittance at a later version. The laser is constructed in a hybrid Yb:fiber and Yb:YAG architecture. Our prototype delivers 180 uJ pulse energy at 1030 nm and 1 MHz intra-burst rate and we demonstrated conversion of 50µJ of the NIR beam to DUV, resulting 11.5µJ at 21ps (FWHM) and 6.15 µJ at 1.05 ps (FWHM) pulse duration.}},
}