Cold electron and ion beams generated from trapped atoms

Claessens, B.J.C.; Reijnders, M.P.; Taban, G.; Luiten, O.J.; Vredenbregt, E.J.D.

doi:10.1063/1.2771518

Cited by 48 publications

(28 citation statements)

References 26 publications

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“…Cold atom sources have generated electron bunches with high coherence, up to 10 nm at the source 11 . The bunch charge can be a few picocoulombs, sufficient for single-shot imaging of nanocrystals of biomolecules 12,13 , but the nanosecond duration of the electron bunches has been too long for observation of useful dynamics.…”

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confidence: 99%

“…With a cold atom source, electrons are typically produced by photionization of cold atoms in a two-step process, with microsecond laser excitation to an intermediate atomic state and nanosecond ionization of the excited atoms 11,13 . Timedependent extraction fields can be used to reduce the electron bunch length 14 , but picosecond switching times are not feasible.…”

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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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High-coherence picosecond electron bunches from cold atoms

et al. 2013

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“…After first preliminary experiments [8], the UCIS potential of delivering beams of LMIS brightness was recently demonstrated [9]. In this Letter we present detailed TOF energy spread measurements on rubidium ion bunches extracted from a UCIS.…”

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Low-Energy-Spread Ion Bunches from a Trapped Atomic Gas

et al. 2009

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“…This implies that the minimal transverse normalized emittance that can be achieved scales with the square root of bunch charge: ϵ ∝ ⊥ N . An interesting new development is the ultracold electron source, which is based on near-threshold photoionization of laser-cooled atomic gases [7][8][9][10][11][12][13][14][15]. The ultracold source is characterized by effective temperatures as low as ∼ T 10 K. This implies that for the same source size, and thus the same bunch charge, bunches can be produced with an emittance 1-2 orders of magnitude lower than by photoemission.…”

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confidence: 99%

An ultracold electron source as an injector for a compact SASE-FEL

Geer

Vredenbregt

Luiten

et al. 2014

J. Phys. B: At. Mol. Opt. Phys.

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Ultracold electron sources based on near-threshold photoionization of laser-cooled atomic gases can produce ultrashort electron pulses with a brightness potentially exceeding conventional pulsed electron sources. They are presently being developed for single shot ultrafast electron diffraction, where a bunch charge of 100 fC is sufficient. For application as an injector for x-ray free electron lasers (FEL) a larger bunch charge is generally required. Here we present preliminary calculations of an ultracold electron source operating at bunch charges up to 1 pC. We discuss the relevant bunch degradation processes that occur when the charge is increased. Using general particle tracer tracking simulations we show that bunches can be produced of sufficient quality for driving a 1 Å self amplified spontaneous emission free electron laser (SASE-FEL) at 1.3 GeV electron energy. In addition we speculate on the possibility of using the ultracold source for driving a 15 MeV SASE-FEL in Compton backscatter configuration into the quantum FEL regime.

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Cold electron and ion beams generated from trapped atoms

Cited by 48 publications

References 26 publications

High-coherence picosecond electron bunches from cold atoms

High-coherence picosecond electron bunches from cold atoms

Low-Energy-Spread Ion Bunches from a Trapped Atomic Gas

An ultracold electron source as an injector for a compact SASE-FEL

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