Demonstration of two-color x-ray free-electron laser pulses with a sextupole magnet

Dijkstal, Philipp; Malyzhenkov, Alexander; Reiche, S.; Prat, Eduard

doi:10.1103/physrevaccelbeams.23.030703

Cited by 14 publications

(7 citation statements)

References 47 publications

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“…It is achieved with a method ( Fig. 1 ) that combines a “slotted” foil ( 11 , 12 ) (or, equivalently, energy modulation or laser slicing, which may be more appropriate for high-repetition-rate FELs), transverse tilting of the electron beam ( 13 – 15 ), and self-seeding ( 16 – 20 ). The latter is a two-stage process to generate coherent X-ray pulses: The first FEL stage consists of a standard self-amplified spontaneous emission (SASE) section, whose output is spectrally filtered by a monochromator.…”

Section: Generation Of Phase-locked X-ray Pulsesmentioning

confidence: 99%

A perfect X-ray beam splitter and its applications to time-domain interferometry and quantum optics exploiting free-electron lasers

Reiche

Knopp

Pedrini

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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X-ray free-electron lasers (FELs) deliver ultrabright X-ray pulses, but not the sequences of phase-coherent pulses required for time-domain interferometry and control of quantum states. For conventional split-and-delay schemes to produce such sequences, the challenge stems from extreme stability requirements when splitting Ångstrom wavelength beams, where the tiniest path-length differences introduce phase jitter. We describe an FEL mode based on selective electron-bunch degradation and transverse beam shaping in the accelerator, combined with a self-seeded photon emission scheme. Instead of splitting the photon pulses after their generation by the FEL, we split the electron bunch in the accelerator, prior to photon generation, to obtain phase-locked X-ray pulses with subfemtosecond duration. Time-domain interferometry becomes possible, enabling the concomitant program of classical and quantum optics experiments with X-rays. The scheme leads to scientific benefits of cutting-edge FELs with attosecond and/or high-repetition rate capabilities, ranging from the X-ray analog of Fourier transform infrared spectroscopy to damage-free measurements.

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Section: Generation Of Phase-locked X-ray Pulsesmentioning

confidence: 99%

A perfect X-ray beam splitter and its applications to time-domain interferometry and quantum optics exploiting free-electron lasers

Reiche

Knopp

Pedrini

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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“…Various schemes for generation of two-color beams at XFEL facilities have been proposed [20][21][22][23][24][25], for instance utilizing variable-gap undulators [21], or using a single monochromatizing crystal as demonstrated in Ref. [22].…”

Section: Introductionmentioning

confidence: 99%

“…[22]. Recently, the methods by using a double-slotted foil on a chirped beam [23] or sextupole magnet [24] have been performed. In contrast to single-photon ionization, the total cross section of TPI shows a strong dependence not only on the energies of the photons but also on their polarizations.…”

Section: Introductionmentioning

confidence: 99%

Relativistic calculations of two-color two-photon K-shell ionization

et al. 2022

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We investigate the two-color two-photon K-shell ionization of neutral atoms based on the relativistic second-order perturbation theory and independent particle approximation. Analytical expressions for the relativistic and nonrelativistic total cross sections are derived in terms of radial transition amplitudes and Stokes parameters. Particular attention is paid especially to how the two-photon ionization total cross section depends on the energy sharing and polarization of the two incident photons. We construct the nonrelativistic expressions of cross section ratios for different polarization combinations of the two incident photons. The numerical results of total cross section and cross section ratios show that the energy sharing of the two incident photons plays an essential role in two-photon K-shell ionization. Particularly, if the energies of the two incident photons are identical, the total cross section and cross section ratios will reach the minimum or maximum value. Moreover, due to the strong screening effects, we find strong deviations of the cross section ratios near the two-photon ionization threshold of the Ne atom. Graphical abstract

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“…Since the first hard X-ray free electron laser facility started its operation [6], extensive researches to provide better X-ray conditions for applications have been carried out. One of the research directions was generating two X-ray pulses having time separation or even energy separation, so called two-color X-ray [7][8][9][10][11][12][13]. Recently these researches were extended to generate multi-color X-rays.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal phase space manipulation using double emittance exchange to generate multi-color X-ray

Seok

Ha²,

Power³

et al. 2021

Preprint

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Demonstration of two-color x-ray free-electron laser pulses with a sextupole magnet

Cited by 14 publications

References 47 publications

A perfect X-ray beam splitter and its applications to time-domain interferometry and quantum optics exploiting free-electron lasers

A perfect X-ray beam splitter and its applications to time-domain interferometry and quantum optics exploiting free-electron lasers

Relativistic calculations of two-color two-photon K-shell ionization

Longitudinal phase space manipulation using double emittance exchange to generate multi-color X-ray

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