Electron sources for accelerators

Hernández-García, Carlos; O’Shea, P.G.; Stutzman, Marcy

doi:10.1063/1.2883909

Cited by 95 publications

(57 citation statements)

References 16 publications

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“…Careful characterization and optimization of the initial emittance is vital, and the unique shaping abilities of a CAES allow these measurements and optimization to be performed in real time. Combination of electron bunch shaping and two-colour photoionization allows for creation of the ideally distributed sub-260 ps electron pulses, which are suitable not only for UED but also for injection into particle accelerators, synchrotrons and free-electron lasers 23 .…”

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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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%

High-coherence picosecond electron bunches from cold atoms

et al. 2013

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“…Most notably, such gases are used for converting their electronic polarization to the polarization of nuclear spins [1], one of the key elements in nuclear magnetic resonance imaging [2]. Equally important, they provide a source of spin-polarized electrons [3,4] for particle-physics experiments [5], as well as for probing molecular dynamics during chemical reactions and analyzing the electronic properties of materials [6].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Magnetization of a Dense Molecular Gas with an Optical Centrifuge

2017

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Strong laser-induced magnetization of oxygen gas at room temperature and atmospheric pressure is achieved experimentally on the sub-nanosecond time scale. The method is based on controlling the electronic spin of paramagnetic molecules by means of manipulating their rotation with an optical centrifuge. Spin-rotational coupling results in high degree of spin polarization on the order of one Bohr magneton per centrifuged molecule. Owing to the non-resonant interaction with the laser pulses, the demonstrated technique is applicable to a broad class of paramagnetic rotors. Executed in a high-density gas, it may offer an efficient way of generating macroscopic magnetic fields remotely (as shown in this work), producing large amount of polarized electrons and converting electronic to nuclear spin polarization.

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“…There are many components which are responsible to produce a good polarized electron beam [157]. The polarized electron source and the electron accelerator in Thomas Jefferson National Accelerator Facility (TJNAF) will be briefly discussed in the following sections.…”

Section: Polarized Electron Beammentioning

confidence: 99%

Proton form factor ratio, μpGEP/GMP from double spin asymmetry

Liyanage¹,

Pushpakumari²

2013

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Array (BETA), elastic measurements were carried out in parallel. The elastic double spin asymmetry allows one to extract the proton electric to magnetic form factorIn addition to the coincidence data, inclusively scattered electrons from the polarized ammonia target were detected by HMS, which allows to measure the beam-target asymmetry in the elastic region with the target spin nearly perpendicular to the momentum transfer,This alternative measurement of G

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Electron sources for accelerators

Abstract: Photoemission shines as a source of the bright electron beams required for free-electron lasers and particle-physics accelerators.

Cited by 95 publications

References 16 publications

High-coherence picosecond electron bunches from cold atoms

High-coherence picosecond electron bunches from cold atoms

Ultrafast Magnetization of a Dense Molecular Gas with an Optical Centrifuge

Proton form factor ratio, μ<sub>p</sub>G<sub>E</sub><sup>P</sup>/G<sub>M</sub><sup>P</sup> from double spin asymmetry

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