Experimental Demonstration of a Soft X-Ray Self-Seeded Free-Electron Laser

Ratner, Daniel; Abela, R.; Amann, J.; Behrens, C.; Bohler, Dorian; Bouchard, G.; Bostedt, Christoph; Boyes, Matt; Chow, K.; Cocco, Daniele; Decker, F.‐J.; Ding, Yuantao; Eckman, C.; Emma, P.; Fairley, D.; Feng, Yiping; Field, C.; Flechsig, U.; Gaßner, Georg; Hastings, J. B.; Heimann, Philip; Huang, Zhirong; Kelez, Nicholas; Krzywiński, J.; Loos, H.; Lutman, Alberto; Marinelli, Agostino; Marcus, Gabriel; Maxwell, Timothy; Montanez, P.; Moeller, Stefan; Morton, Daniel; Nuhn, H.‐D.; Rodes, N.; Schlotter, W. F.; Serkez, Svitozar; Stevens, T.E.; Turner, James J.; Walz, D.; Welch, J.; Wu, Juhao

doi:10.1103/physrevlett.114.054801

Cited by 156 publications

(136 citation statements)

References 19 publications

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“…In addition, when used in self-seeding mode [16]-where a narrow energy distribution in the undulator is especially important-horn collimation has been shown to be of great help in approaching a Fourier-transform limited bandwidth. Thus, this method with the collimator set to a reasonably wide aperture (about ½ of the fully dispersed beam size), can be used to avoid horns in the final bunch distribution.…”

Section: Introductionmentioning

confidence: 99%

Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor

Zhou

Bane

Ding

et al. 2015

Phys. Rev. ST Accel. Beams

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A collimator located in a magnetic bunch compressor of a linear accelerator driven x-ray free electron laser has many potential applications, such as the removal of horns in the current distribution, the generation of ultrashort beams, and as a diagnostic of the beam slice emittance. Collective effects, however, are a major concern in applying the technique. Systematic measurements of emittance and analysis were performed using a collimator in the first bunch compressor of the Linac Coherent Light Source (LCLS). In the nominal, undercompressed configuration using the collimator we find that the y emittance (nonbending plane) is not increased, and the x emittance (in the bending plane) is increased by about 25%, in comparison to the injector emittance. From the analysis we conclude that the parasitic effects associated with this method are dominated by coherent synchrotron radiation (CSR), which causes a "systematic error" for measuring slice emittance at the bending plane using the collimation method. In general, we find good agreement between the measurements and simulations including CSR. However, for overcompressed beams at smaller collimator gaps, an extra emittance increase is found that does not agree with 1D simulations and is not understood.

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Section: Introductionmentioning

confidence: 99%

Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor

Zhou

Bane

Ding

et al. 2015

Phys. Rev. ST Accel. Beams

Self Cite

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“…The relatively large bandwidth of the noisy SASE spectrum can be reduced using a self-seeding scheme, where light from the first half of the undulator is used to seed the second half, after having passed through a monochromator. This approach has been successful for improving the spectral brightness of SASE pulses, both in the hard and soft x-ray spectral regions [15,16]. Double-pulse schemes have been developed for SASE FELs that provide high-intensity two-color pulses with a variable pulse delay and flexible color separation [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Echo-Enabled Harmonic Generation Studies for the FERMI Free-Electron Laser

et al. 2017

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Studying ultrafast processes on the nanoscale with element specificity requires a powerful femtosecond source of tunable extreme-ultraviolet (XUV) or x-ray radiation, such as a free-electron laser (FEL). Current efforts in FEL development are aimed at improving the wavelength tunability and multicolor operation, which will potentially lead to the development of new characterization techniques offering a higher chemical sensitivity and improved spatial resolution. One of the most promising approaches is the echo-enabled harmonic generation (EEHG), where two external seed lasers are used to precisely control the spectro-temporal properties of the FEL pulse. Here, we study the expected performance of EEHG at the FERMI FEL, using numerical simulations. We show that, by employing the existing FERMI layout with minor modifications, the EEHG scheme will be able to produce gigawatt peak-power pulses at wavelengths as short as 5 nm. We discuss some possible detrimental effects that may affect the performance of EEHG and compare the results to the existing double-stage FEL cascade, currently in operation at FERMI. Finally, our simulations show that, after substantial machine upgrades, EEHG has the potential to deliver coherent multicolor pulses reaching wavelengths as short as 3 nm, enabling x-ray pump-x-ray probe experiments in the water window.

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“…In order to obtain fully coherent x-ray light pulses, a variety of new lasing schemes have been proposed and already demonstrated. For example, direct-seeding [10], self-seeding [11][12][13][14], high-gain harmonic generation [15][16][17][18][19][20], echo-enhanced harmonic generation [21], phase-merging enhanced harmonic generation [22,23], x-ray free-electron laser oscillator [24][25][26], in particular the self-seeding method is the most widely used scheme in hard XFEL facilities.…”

Section: Introductionmentioning

confidence: 99%

Atomic inner-shell radiation seeded free-electron lasers

Zhang

Yan

et al. 2018

Phys. Rev. Accel. Beams

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In order to effectively improve the output quality of x-ray free electron laser (XFEL), we theoretically propose an XFEL scheme seeded by atomic inner-shell laser. Atomic inner-shell lasers based on neutral atoms and pumped by XFEL have been experimentally demonstrated [Rohringer et al., Nature (London) 481, 488 (2012), Yoneda et al., Nature (London) 524, 446 (2015)], which produced sub-femtosecond X-ray pulses with increased temporal coherence. It shows that, by using the inner-shell laser as a seed to modulate the electron bunch, very stable and almost fully-coherent short-wavelength XFEL pulses can be generated. The proposed scheme holds promising prospects in x-ray wavelengths, and even shorter.

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Experimental Demonstration of a Soft X-Ray Self-Seeded Free-Electron Laser

Cited by 156 publications

References 19 publications

Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor

Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor

Echo-Enabled Harmonic Generation Studies for the FERMI Free-Electron Laser

Atomic inner-shell radiation seeded free-electron lasers

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