Generation of ultra-large-bandwidth X-ray free-electron-laser pulses with a transverse-gradient undulator

Prat, Eduard; Calvi, M.; Reiche, S.

doi:10.1107/s1600577516007177

Cited by 32 publications

(28 citation statements)

References 34 publications

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“…A sophisticated undulator approach (CHIC) 72 ensures a flexible photon source for experiments, 73,110 and a novel undulator design (APPLE X) allows for easy control over polarization and photon energy 74 . The definition of the three beamlines and their experimental stations is currently in progress in consultation with the SwissFEL user community.…”

Section: Concepts Instruments and Methodsmentioning

confidence: 99%

Perspective: Opportunities for ultrafast science at SwissFEL

Beaud

Bokhoven

Chergui

et al. 2017

Structural Dynamics

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Section: Concepts Instruments and Methodsmentioning

confidence: 99%

Perspective: Opportunities for ultrafast science at SwissFEL

Beaud

Bokhoven

Chergui

et al. 2017

Structural Dynamics

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“…Since a standard HGHG configuration usually employs a normal modulator, this simple method may provide a way to operate a PEHG FEL with a standard HGHG configuration. Moreover, we believe that the natural transverse gradient of a normal planar modulator also has the potential of being applied to other purposes of TGUs, such as high-gain X-FELs in diffraction-limited storage rings , the generation of ultra-large-bandwidth X-FELs (Prat et al, 2016) and so on.…”

Section: Discussionmentioning

confidence: 99%

Phase-merging enhanced harmonic generation free-electron laser with a normal modulator

Zhao

Jia

2017

J Synchrotron Radiat

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A phase-merging enhanced harmonic generation free-electron laser (FEL) was proposed to increase the harmonic conversion efficiency of seeded FELs and promote the radiation wavelength towards the X-ray spectral region. However, this requires a specially designed transverse gradient undulator (TGU) as the modulator to couple the transverse and longitudinal phase space of the electron beam. In this paper, the generation of the phase-merging effect is explored using the natural field gradient of a normal planar undulator. In this method, a vertical dispersion on the electron beam is introduced and then the dispersed beam travels through a normal modulator in a vertical off-axis orbit where the vertical field gradient is selected properly in terms of the vertical dispersion strength and modulation amplitude. The phase-merging effect will be generated after passing through the dispersive chicane. Theoretical analysis and numerical simulations for a seeded soft X-ray FEL based on parameters of the Shanghai Soft X-ray FEL project are presented. Compared with a TGU modulator, using the natural gradient of a normal planar modulator has the distinct advantage that the gradient can be conveniently tuned in quite a large range by adjusting the beam orbit offset.

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“…The electrons in the so-called 'tilted beam' can be characterized by the transverse offset x in proportion to the longitudinal position s. The coupling between the longitudinal and transverse positions of the particles is normally unwanted in the conventional FEL facilities for the reason that only a fraction of the beam can contribute to the FEL radiation and therefore the corresponding output performance is degraded. However, the recent researches demonstrated that the tilted beam has many important applications, such as production of broad-bandwidth radiation [18,19], generation of ultrashort FEL pulse [20][21][22] and generation of twocolor pulses [23,24] and so on. Such applications can satisfy some specific experimental requirements, for instance, the pump-probe experiments and nonlinear optics experiments.…”

Section: Methodsmentioning

confidence: 99%

Generation of coherent two-color pulses at two adjacent harmonics in a seeded free-electron laser

Zhao

Jia

2018

Phys. Rev. Accel. Beams

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The growing requirements of pump-probe techniques and nonlinear optics experiments greatly promote the studies of two-color free-electron lasers (FELs). We propose a new method to generate coherent two-color pulses in a high-gain harmonic generation (HGHG) FEL. In this scheme, an initial tilted electron beam is sent though the modulator and dispersive section of an HGHG FEL to generate the bunching at harmonics of the seed laser. Then a transverse gradient undulator (TGU) is adopted as the radiator and in such radiator, only two separated fractions of the tilted beam will resonate at two adjacent harmonics of the seed laser and are enabled to emit the coherent two-color pulses simultaneously. The time separation between the two pulses are on the order of hundreds of femtoseconds, and can be precisely controlled by varying the tilted amplitude of the electron beam and/or the transverse gradient of the TGU radiator. Numerical simulations confirm the validity and feasibility of this scheme in the EUV waveband.

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Generation of ultra-large-bandwidth X-ray free-electron-laser pulses with a transverse-gradient undulator

Cited by 32 publications

References 34 publications

Perspective: Opportunities for ultrafast science at SwissFEL

Perspective: Opportunities for ultrafast science at SwissFEL

Phase-merging enhanced harmonic generation free-electron laser with a normal modulator

Generation of coherent two-color pulses at two adjacent harmonics in a seeded free-electron laser

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