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TH2A0 |
Short Free-electron Laser Pulses: The User Perspective |
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- C. Bostedt
PSI, Villigen PSI, Switzerland
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Free-electron laser sources can deliver x-ray pulses with unprecedented intensities. While often the performance of the x-ray laser sources and experimental needs revolve about the achievable pulse energies, the pulse length is an equally or perhaps even more important parameter. Already the first ionization measurements in atomic neon revealed that the x-ray dynamics change fundamentally when the pulse length approaches the femtosecond time scales of inner-shell decay processes [1]. Related, the pulse length was demonstrated to be an important parameter for the electronic response in diffraction experiments [2] and discussed in the broader context of damage processes in femtosecond crystallography [3] and imaging [4]. With the advent of attosecond x-ray pulses, new opportunities opened for non-linear X-ray spectroscopy [5] as well as following coherent electronic processes [6]. In my talk, I will briefly present these various short pulse applications to set the stage for the workshop discussions.
[1] Young et al., Nature 466, 7302 (2010)
[2] Ferguson et al., Sci. Adv. 2, 1500837 (2016)
[3] Nass et al., Nat. Comm. 11, 1814 (2020)
[4] Ho et al., Nat. Comm 11, 167 (2020)
[5] O¿Neil, PRL 125, 073203 (2020)
[6] Li., Science 375, 285 (2022)
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Slides TH2A0 [2.888 MB]
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TH2A1 |
Dechirper System for Fresh-slice Applications at the European XFEL |
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- W. Qin, W. Decking, M.W. Guetg, J.J. Guo, S. Liu, T. Wohlenberg, I. Zagorodnov
DESY, Hamburg, Germany
- E. Gjonaj
TEMF, TU Darmstadt, Darmstadt, Germany
- J.J. Guo
SINAP, Shanghai, People’s Republic of China
- J.J. Guo
University of Chinese Academy of Sciences, Beijing, People’s Republic of China
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Fresh-slice lasing using dechirper induced time-dependent orbit oscillation is capable of producing high intensity two-color XFEL pulses and high power short pulses at femtosecond level. At the European XFEL, a dechirper system for fresh-slice applications for both the hard x-ray beamline SASE1 and the soft x-ray SASE3 beamline is being developed. In this contribution, we present the novel design of the wakefield structure and initial commissioning efforts.
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TH2A2 |
Generation of Intense Attosecond Pulses at the European XFEL |
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- J.W. Yan, G. Geloni, C. Lechner, S. Serkez
EuXFEL, Schenefeld, Germany
- Y. Chen, P. Dijkstal, M.W. Guetg, E. Schneidmiller
DESY, Hamburg, Germany
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X-ray free-electron lasers (XFELs) have paved the way for significant advancements in attosecond science by generating intense, ultrashort pulses. We are currently developing AttoSecond Pulses with eSASE and Chirp-Taper schemes (ASPECT) project at the European XFEL, designed to exploit these capabilities. In its initial stages, ASPECT will be used to produce attosecond-long pulses at two out of the three SASE lines at the European XFEL: SASE1 and SASE3, dedicated to producing hard and soft x-rays respectively. In this presentation, we will report design studies and preliminary experimental results at the European XFEL.
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TH2A3 |
Progress on Fresh-slice Multi-stage Amplification at SwissFEL |
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- G.L. Wang, E. Prat, S. Reiche, K. Schnorr
PSI, Villigen PSI, Switzerland
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We present the progress of generating high-power and short FEL pulses using the fresh-slice multi-stage amplification scheme at Athos, the soft X-ray beamline of SwissFEL. We use a transversely tilted electron beam traveling through the unique Athos layout with magnetic chicanes between every two undulator modules. The tail of the bunch produces a short pulse in the first amplification stage. The rest of the electron beam further amplifies the short FEL pulse in up to three additional stages. Our results show the production of FEL radiation with pulse energies of several hundreds of microjoules and pulse durations of about one femtosecond. This operation mode will allow us to advance the scientific opportunities of nonlinear optics and imaging experiments.
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Slides TH2A3 [2.411 MB]
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