How to Realize Uniform Three-Dimensional Ellipsoidal Electron Bunches

Luiten, O.J.; Geer, S.B. van der; Loos, M. J. de; Kiewiet, F. B.; Wiel, M.J. van der

doi:10.1103/physrevlett.93.094802

Cited by 195 publications

(174 citation statements)

References 10 publications

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“…Except for the case of a uniform ellipsoidal bunch, the greatest emittance growth occurs at the beam edges 22 . The emittance measured with the pepper-pot at the source is therefore greater than the emittance one would measure if the whole atom cloud was ionized, and the emittance measured with a mechanical pepper-pot mask at some point downstream.…”

Section: Demonstration Of Low Emittance and High Transverse Coherencementioning

confidence: 99%

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High-coherence picosecond electron bunches from cold atoms

et al. 2013

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Ultrafast electron diffraction enables the study of molecular structural dynamics with atomic resolution at subpicosecond timescales, with applications in solid-state physics and rational drug design. Progress with ultrafast electron diffraction has been constrained by the limited transverse coherence of high-current electron sources. Photoionization of laser-cooled atoms can produce electrons of intrinsically high coherence, but has been too slow for ultrafast electron diffraction. Ionization with femtosecond lasers should in principle reduce the electron pulse duration, but the high bandwidth inherent to short laser pulses is expected to destroy the transverse coherence. Here we demonstrate that a two-colour process with femtosecond excitation followed by nanosecond photoionization can produce picosecond electron bunches with high transverse coherence. Ultimately, the unique combination of ultrafast ionization, high coherence and three-dimensional bunch shaping capabilities of cold atom electron sources have the potential for realising the brightness and coherence requirements for single-shot electron diffraction from crystalline biological samples.

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Section: Demonstration Of Low Emittance and High Transverse Coherencementioning

confidence: 99%

“…Ellipsoidal bunches preserve their initial linearity in phase space, meaning the Coulomb expansion can be completely reversed with linear optics and without degradation of coherence 22 . With such bunches, the brightness is then limited by the initial phase-space density of the source.…”

Section: Demonstration Of Low Emittance and High Transverse Coherencementioning

confidence: 99%

High-coherence picosecond electron bunches from cold atoms

et al. 2013

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“…Furthermore, real electron packets do not necessarily maintain their initial shapes, during expansion, with the noted exception of ellipsoidal packets. 13 For quantitative comparison of the results obtained from the mean field theory, the numerical simulation, and experiment, we choose the standard deviation as the universal metric of size. Two packets are deemed ''equivalent'' when they have the same standard deviations regardless of the shape of the distribution.…”

Section: Theorymentioning

confidence: 99%

Ultrashort electron pulses for diffraction, crystallography and microscopy: theoretical and experimental resolutions

Gahlmann

Park

Zewail

2008

Phys. Chem. Chem. Phys.

120

125

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Pulsed electron beams allow for the direct atomic-scale observation of structures with femtosecond to picosecond temporal resolution in a variety of fields ranging from materials science to chemistry and biology, and from the condensed phase to the gas phase. Motivated by recent developments in ultrafast electron diffraction and imaging techniques, we present here a comprehensive account of the fundamental processes involved in electron pulse propagation, and make comparisons with experimental results. The electron pulse, as an ensemble of charged particles, travels under the influence of the space-charge effect and the spread of the momenta among its electrons. The shape and size, as well as the trajectories of the individual electrons, may be altered. The resulting implications on the spatiotemporal resolution capabilities are discussed both for the N-electron pulse and for single-electron coherent packets introduced for microscopy without space-charge.

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“…The advantage of the ellipsoidal distribution is that also the transverse space charge field is linear for all aspect ratios of the bunch; its disadvantage is that is not easily generated by a laser pulse. (The so-called blow-out concept [7,8] is not discussed at this point for its unfavorable transverse emittance results [9,10].) Thus for the following calculations the parabolic distribution has been chosen.…”

Section: Bunch Compression Limitationsmentioning

confidence: 99%

Generation of sub-fs electron beams at few-MeV energies

Floettmann¹

2014

Nuclear Instruments and Methods in Physics Research Section A:

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Time resolved electron diffraction is an alternative approach to FEL based X-ray experiments for the study of structural dynamics of matter on the relevant timescales. The required electron beam parameters are demanding in terms of emittance and bunch length and require the operation at charges typically well below 1 pC. Moreover the energy is lowa few MeV only. The longitudinal compression of the bunches can be realized with a simple longitudinal focusing scheme in a drift. In this paper the question of what limits the bunch length in this parameter regime is addressed by means of numerical simulations. Beside emittance increasing space charge effects also rf-curvature and nonlinear compression are identified as limiting factors.

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How to Realize Uniform Three-Dimensional Ellipsoidal Electron Bunches

Cited by 195 publications

References 10 publications

High-coherence picosecond electron bunches from cold atoms

High-coherence picosecond electron bunches from cold atoms

Ultrashort electron pulses for diffraction, crystallography and microscopy: theoretical and experimental resolutions

Generation of sub-fs electron beams at few-MeV energies

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