Structured electron beams from nano-engineered cathodes

Lueangaramwong, Anusorn; Mihalcea, D.; Andonian, G.; Piot, P.

doi:10.1063/1.4975892

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…One promising application of the technique is the possible generation of narrowband electromagnetic radiation enhanced at the wavelength λ n ∼ ∆ζ/n (where n is an integer). Reaching ultrashort wavelength (high harmonic number n) will require the use of smaller laser pattern or nano-engineered cathodes capable of producing transversely-segmented beams 1,24,25 . In addition, attaining these finer-scale modulations will also require a thorough control of optical aberrations along the accelerator and in particular within the TLEX beamline 21,26 .…”

Section: Discussionmentioning

confidence: 99%

Tailoring of an electron-bunch current distribution via space-to-time mapping of a transversely shaped, photoemission-laser pulse

Halavanau

Gao

Conde

et al. 2019

Phys. Rev. Accel. Beams

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Temporally-shaped electron bunches at ultrafast time scales are foreseen to support an array of applications including the development of small-footprint accelerator-based coherent light sources or as probes for, e.g., ultrafast electron-diffraction. We demonstrate a method where a transverselysegmented electron bunch produced via photoemission from a transversely-patterned laser distribution is transformed into an electron bunch with modulated temporal distribution. In essence, the presented transformation enables the mapping of the transverse laser distribution on a photocathode surface to the temporal coordinate and provides a proof-of-principle experiment of the method proposed in Reference [W. S. Graves, et al. Phys. Rev. Lett. 108, 263904 (2012)] as a path toward the realization of compact coherent X-ray sources, albeit at a larger timescale. The presented experiment is validated against numerical simulations and the versatility of the concept, e.g. to tune the current-distribution parameters, is showcased. Although our work focuses on the generation of electron bunches arranged as a temporal comb it is applicable to other temporal shapes.

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Section: Discussionmentioning

confidence: 99%

Tailoring of an electron-bunch current distribution via space-to-time mapping of a transversely shaped, photoemission-laser pulse

Halavanau

Gao

Conde

et al. 2019

Phys. Rev. Accel. Beams

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“…This new distribution is then used as a starting distribution in an RF gun and the corresponding dynamics simulated with the fast PIC program Astra [9]. To date our efforts have focused on transversely imaging the cathode-array structure downstream of an accelerator beamline with 4 × 4 transfer matrix R. Given the Courant-Snyder parameters [for the horizontal plane (α x,1 , β x,1 )] associated to a single beamlet (formed from a nanohole) along with the parameters computed of the entire beam (α x , β x ) we found a general relationship that ensure single-particle imaging in the horizontal plane to be [10] single-beamlet emittance [11]. The latter set of equations respectively force (i) each beamlet to be at a waist (we assume all the beamlets have identical parameters) and (ii) the entire beam to be collimated.…”

Section: Acceleration In An Rf Gunmentioning

confidence: 97%

Numerical simulations of early-stage dynamics of electron bunches emitted from plasmonic photocathodes

Lueangaramwong

Mihalcea

Andonian

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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High-brightness electron sources are a key ingredient to the development of compact accelerator-based light sources. The electron sources are commonly based on (linear) photoemission process where a laser pulse with proper wavelength impinges on the surface of a metallic or semiconductor photocathode. Very recently, the use of plasmonic cathodescathodes with a nano-patterned surface -have demonstrated great enhancement in quantum efficiencies [1]. Alternatively, this type of photocathodes could support the formation of structured beams composed of transversely-separated beamlets. In this paper we discuss numerical simulations of the early-stage beam dynamics of the emission process from plasmonic cathodes carried out using the Warp [2] framework. The model is used to investigate the properties of beams emitted from these photocathode and subsequently combined with particle-in-cell simulations to explore the imaging of cathode pattern after acceleration in a radiofrequency gun.

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Structured electron beams from nano-engineered cathodes

Cited by 2 publications

References 10 publications

Tailoring of an electron-bunch current distribution via space-to-time mapping of a transversely shaped, photoemission-laser pulse

Tailoring of an electron-bunch current distribution via space-to-time mapping of a transversely shaped, photoemission-laser pulse

Numerical simulations of early-stage dynamics of electron bunches emitted from plasmonic photocathodes

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