Compact ultracold electron source based on a grating magneto-optical trap

Franssen, J.G.H.; Raadt, T. C. H. de; Ninhuijs, M A W van; Luiten, O.J.

doi:10.1103/physrevaccelbeams.22.023401

Cited by 32 publications

(19 citation statements)

References 36 publications

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“…To create a UNP, we implemented a compact magnetooptical trap based on a diffraction grating chip to laser cool and trap 85 Rb atoms (see Fig. 1) [25,26].…”

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Microwave cavity resonance spectroscopy of ultracold plasmas

et al. 2019

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“…To create a UNP, we implemented a compact magnetooptical trap based on a diffraction grating chip to laser cool and trap 85 Rb atoms (see Fig. 1) [25,26].…”

mentioning

confidence: 99%

“…The laser cooling beam has a nearly flattop profile with a radius r b = 12.7 mm and an intensity I 0 = 24 mW/cm 2 . This creates an overlap volume with a height h = r b cot(θ ) ∼ 1 cm, which fits in the 5 GHz cavity and allows us to trap 7 × 10 7 atoms [25,26].…”

mentioning

confidence: 99%

Microwave cavity resonance spectroscopy of ultracold plasmas

et al. 2019

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“…As a means for beam generation, photoemission affords fine control of the electron distribution both in space and time via laser shaping [31][32][33][34] . To increase spatial beam quality, in this work we employ photocathodes with high intrinsic brightness and further tune the photoemission wavelength 35,36 .…”

Section: Introductionmentioning

confidence: 99%

A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes

Li¹,

Duncan²,

Andorf³

et al. 2021

Preprint

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We report the design and performance of a time-resolved electron diffraction apparatus capable of producing intense bunches with < 200 fs rms duration, single digit micron probe sizes, and simultaneously long coherence length. To generate high brightness electron bunches, the system employs high efficiency, low emittance semiconductor photocathodes driven with a wavelength near the photoemission threshold at a repetition rate up to 250 kHz. We characterize spatial, temporal, and reciprocal space resolution of the apparatus and perform proof-of-principle measurements of ultrafast heating in single crystal Au samples.

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“…Thus very few electrons will be within one Debye screening length of any given electron [15]. This situation has been studied extensively for ultracold gas-based plasma and electron sources, which exhibit single meV electron temperatures in photoemission [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Point-to-Point Coulomb Effects in High Brightness Photoelectron Beamlines for Ultrafast Electron Diffraction

Gordon,

van der Geer,

Maxson

et al. 2021

Preprint

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In an effort to increase spatial and temporal resolution of ultrafast electron diffraction and microscopy, ultra-high brightness photocathodes are actively sought to improve electron beam quality. Beam dynamics codes often approximate the Coulomb interaction with mean-field space charge, which is a good approximation in traditional beams. However, point-to-point Coulomb effects, such as disorder induced heating and the Boersch effect, can not be neglected in cold, dense beams produced by such photocathodes. In this paper, we introduce two new numerical methods to calculate the important effects of the photocathode image charge when using a point-to-point interaction model. Equipped with an accurate model of the image charge, we calculate the effects of point-topoint interactions on two high brightness photoemission beamlines for ultrafast diffraction. The first beamline uses a 200 keV gun, whereas the second uses a 5 MeV gun, each operating in the singleshot diffraction regime with 10 5 electrons/pulse. Assuming a zero photoemission temperature, it is shown that including stochastic Coulomb effects increases the final emittance of these beamlines by over a factor of 2 and decreases the peak transverse phase space density by over a factor of 3 as compared to mean-field simulations. We then introduce a method to compute the energy released by disorder induced heating using the pair correlation function. This disorder induced heating energy was found to scale very near the theoretical result for stationary ultracold plasmas, and it accounts for over half of the emittance growth above mean-field simulations.

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Compact ultracold electron source based on a grating magneto-optical trap

Cited by 32 publications

References 36 publications

Microwave cavity resonance spectroscopy of ultracold plasmas

Microwave cavity resonance spectroscopy of ultracold plasmas

A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes

Point-to-Point Coulomb Effects in High Brightness Photoelectron Beamlines for Ultrafast Electron Diffraction

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