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

Nanni, Emilio A.; Graves, W.; Moncton, D. E.

doi:10.1103/physrevaccelbeams.21.014401

Cited by 38 publications

(29 citation statements)

References 35 publications

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“…Another significant improvement would be the use of nano-modulated electrons that could make the radiation coherent from multiple electrons (microbunching). These nanomodulated electrons can be generated via emittance exchange techniques [49,50], laser-plasma interactions [51], or electromagnetic intensity gratings [52]. Future work could develop structures that achieve resonant PCB conditions for the interaction between the propagating electrons and the periodic structure in order to improve the emission efficiency of PCB radiation.…”

Section: Discussionmentioning

confidence: 99%

Tunable free-electron X-ray radiation from van der Waals materials

et al. 2020

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Section: Discussionmentioning

confidence: 99%

Tunable free-electron X-ray radiation from van der Waals materials

et al. 2020

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“…Unlike the photons generated in ref. 57 , our photons are at much higher photon energies (e.g., 27 keV). We estimate our source brightness to be 6.7·10 8 photons/s/mm²/mrad²/0.1% BW, assuming an emission area of 3 µm by 5 nm (equal to the cross-section of the electron beam, since our source is highly directional).…”

Section: Discussionmentioning

confidence: 93%

“…Furthermore, engineering the input electron source may scale up the intensity by several orders of magnitude. Periodic prebunching of electrons, which can be performed using diffraction-related methods of electron waveshaping 57 , leads to an enhancement of up to a factor equal to the number of electrons in the bunch 58 . For instance, a similar electron source with an average current of 100 µA composed of 1.6-pC bunches with a repetition rate of 62.5 MHz 59 can improve the radiation intensity by seven orders of magnitude.…”

Section: Discussionmentioning

confidence: 99%

Metasurface-based multi-harmonic free-electron light source

et al. 2018

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Metasurfaces are subwavelength spatial variations in geometry and material where the structures are of negligible thickness compared to the wavelength of light and are optimized for far-field applications, such as controlling the wavefronts of electromagnetic waves. Here, we investigate the potential of the metasurface near-field profile, generated by an incident few-cycle pulse laser, to facilitate the generation of high-frequency light from free electrons. In particular, the metasurface near-field contains higher-order spatial harmonics that can be leveraged to generate multiple higher-harmonic X-ray frequency peaks. We show that the X-ray spectral profile can be arbitrarily shaped by controlling the metasurface geometry, the electron energy, and the incidence angle of the laser input. Using ab initio simulations, we predict bright and monoenergetic X-rays, achieving energies of 30 keV (with harmonics spaced by 3 keV) from 5-MeV electrons using 3.4-eV plasmon polaritons on a metasurface with a period of 85 nm. As an example, we present the design of a four-color X-ray source, a potential candidate for tabletop multicolor hard X-ray spectroscopy. Our developments could help pave the way for compact multi-harmonic sources of high-energy photons, which have potential applications in industry, medicine, and the fundamental sciences.

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“…Beam Shape control and phase space manipulation are required, some examples of beams that might be wanted are: flat beams, compressed beams etc. Transverse to longitudinal phase space exchange techniques exist, such as emittance exchange (EEX) for precise beam profile control and longitudinal bunch shaping [35]. These techniques work by inserting masks in the beam path and utilizing quadrupoles for focusing / defocusing.…”

Section: Workhop-based Collaborationmentioning

confidence: 99%

Advanced Control Methods for Particle Accelerators (ACM4PA) 2019

Scheinker

Emma

Edelen

et al. 2019

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Los Alamos is currently developing novel particle accelerator controls and diagnostics algorithms to enable higher quality beams with lower beam losses than is currently possible. The purpose of this workshop was to consider tuning and optimization challenges of a wide range of particle accelerators including linear proton accelerators such as the Los Alamos Neutron Science Center (LANSCE), rings such as the Advanced Photon Source (APS) synchrotron, free electron lasers (FEL) such as the Linac Coherent Light Source (LCLS) and LCLS-II, the European X-ray Free Electron Laser (EuXFEL), the Swiss FEL, and the planned MaRIE FEL, and plasma wake-field accelerators such as FACET, FACET-II, and AWAKE at CERN. One major challenge is an the ability to quickly create very high quality, extremely intense, custom current and energy profile beams while working with limited real time non-invasive diagnostics and utilizing time-varying uncertain initial beam distributions and accelerator components. Currently, a few individual accelerator labs have been developing and applying their own diagnostics tools and custom control and ML algorithms for automated machine tuning and optimization. The goal of this workshop was to bring together a group of accelerator physicists and accelerator related control and ML experts in order to define which controls and diagnostics would be most useful for existing and future accelerators and to create a plan for developing a new family of algorithms that can be shared and maintained by the community. Organizing CommitteeAlexander Scheinker LANL

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

Cited by 38 publications

References 35 publications

Tunable free-electron X-ray radiation from van der Waals materials

Tunable free-electron X-ray radiation from van der Waals materials

Metasurface-based multi-harmonic free-electron light source

Advanced Control Methods for Particle Accelerators (ACM4PA) 2019

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