High-brightness X-ray free-electron laser with an optical undulator by pulse shaping

Chang, Chao; Liang, Jinyang; Hei, Dongwei; Becker, Michael F.; Tang, Kelei; Feng, Yiping; Yakimenko, V.; Pellegrini, C.; Wu, Juhao

doi:10.1364/oe.21.032013

Cited by 27 publications

(16 citation statements)

References 20 publications

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“…The high-power IR laser pulse used for ICS is equivalent to a static undulator in this x-ray performance estimate. This is physically correct if the laser field is uniform, a challenging issue for which solutions [38][39][40] …”

Section: X-ray Performancementioning

confidence: 99%

Nanomodulated electron beams via electron diffraction and emittance exchange for coherent x-ray generation

Nanni

Graves

Moncton

2018

Phys. Rev. Accel. Beams

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We present a new method for generation of relativistic electron beams with current modulation on the nanometer scale and below. The current modulation is produced by diffracting relativistic electrons in single crystal Si, accelerating the diffracted beam and imaging the crystal structure, then transferring the image into the temporal dimension via emittance exchange. The modulation period can be tuned by adjusting electron optics after diffraction. This tunable longitudinal modulation can have a period as short as a few angstroms, enabling production of coherent hard x-rays from a source based on inverse Compton scattering with total accelerator length of approximately ten meters. Electron beam simulations from cathode emission through diffraction, acceleration, and image formation with variable magnification are presented along with estimates of the coherent x-ray output properties.

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Section: X-ray Performancementioning

confidence: 99%

Nanomodulated electron beams via electron diffraction and emittance exchange for coherent x-ray generation

Nanni

Graves

Moncton

2018

Phys. Rev. Accel. Beams

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“…Its main result is expressed in Eq. (5), but before we discuss it, we would like to emphasize that at the practical level, the required pulse shaping can be done in several ways: spatial light modulators, adaptive beam shaping, or fixed masks [30].…”

Section: Laser Pulse Taperingmentioning

confidence: 99%

Optimized operation of dielectric laser accelerators: Multibunch

Hanuka

Schächter

2018

Phys. Rev. Accel. Beams

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We present a self-consistent analysis to determine the optimal charge, gradient, and efficiency for laser driven accelerators operating with a train of microbunches. Specifically, we account for the beam loading reduction on the material occurring at the dielectric-vacuum interface. In the case of a train of microbunches, such beam loading effect could be detrimental due to energy spread, however this may be compensated by a tapered laser pulse. We ultimately propose an optimization procedure with an analytical solution for group velocity which equals to half the speed of light. This optimization results in a maximum efficiency 20% lower than the single bunch case, and a total accelerated charge of 10 6 electrons in the train. The approach holds promise for improving operations of dielectric laser accelerators and may have an impact on emerging laser accelerators driven by high-power optical lasers.

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“…Very short periods can be provided by in-vacuum undulators and can be as short as 15 mm, with K  1, typically at the expense of a very small tuning range in K. Equation (1) is used to deduce a beam energy of 1.7 GeV (alternatively, we could have chosen, e.g., K  2 to obtain a beam energy comparable to that estimated in the previous approaches, but with a much higher radiation flux). It is worth mentioning that other, more recent solutions for shortening the undulator period and therefore using electron bunches with much lower energy, could be considered for a more aggressive, cost-effective FEL design, such as microwave, superconducting, and optical undulators [44][45][46][47].…”

Section: Cost-driven Approachmentioning

confidence: 99%

On the Importance of Electron Beam Brightness in High Gain Free Electron Lasers

Mitri

2015

Photonics

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Linear accelerators delivering high brightness electron beams are essential for driving short wavelength, high gain free-electron lasers (FELs). The FEL radiation output efficiency is often parametrized through the power gain length that relates FEL performance to electron beam quality at the undulator. In this review article we illustrate some approaches to the preliminary design of FEL linac-drivers, and analyze the relationship between the output FEL wavelength, exponential gain length and electron beam brightness. We extend the discussion to include FEL three-dimensional effects and electron beam projected emittances. Although mostly concentrating on FELs based upon self-amplified spontaneous emission (SASE), our findings are in some cases highly relevant to externally seeded FELs.

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High-brightness X-ray free-electron laser with an optical undulator by pulse shaping

Cited by 27 publications

References 20 publications

Nanomodulated electron beams via electron diffraction and emittance exchange for coherent x-ray generation

Nanomodulated electron beams via electron diffraction and emittance exchange for coherent x-ray generation

Optimized operation of dielectric laser accelerators: Multibunch

On the Importance of Electron Beam Brightness in High Gain Free Electron Lasers

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