Collective Deceleration of Laser-Driven Electron Bunches

Chou, Shao-Wei; Xu, J. J.; Khrennikov, Konstantin; Cardenas, Daniel; Wenz, Johannes; Heigoldt, Matthias; Hofmann, Luisa; Veisz, László; Karsch, Stefan

doi:10.1103/physrevlett.117.144801

Cited by 32 publications

(31 citation statements)

References 37 publications

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“…3 and Supplementary Note 3). In all-optical versions of the scheme, in addition, the driver beam would also be produced by a laser system81012575859606162, which would allow to harness inherently fs or sub-fs level synchronization. Spatial alignment jitter is in general of lesser concern than synchronization, because it has a reduced impact on trapping positions and hence residual energy spread.…”

Section: Discussionmentioning

confidence: 99%

Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams

et al. 2017

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Plasma photocathode wakefield acceleration combines energy gains of tens of GeV m−1 with generation of ultralow emittance electron bunches, and opens a path towards 5D-brightness orders of magnitude larger than state-of-the-art. This holds great promise for compact accelerator building blocks and advanced light sources. However, an intrinsic by-product of the enormous electric field gradients inherent to plasma accelerators is substantial correlated energy spread—an obstacle for key applications such as free-electron-lasers. Here we show that by releasing an additional tailored escort electron beam at a later phase of the acceleration, when the witness bunch is relativistically stable, the plasma wave can be locally overloaded without compromising the witness bunch normalized emittance. This reverses the effective accelerating gradient, and counter-rotates the accumulated negative longitudinal phase space chirp of the witness bunch. Thereby, the energy spread is reduced by an order of magnitude, thus enabling the production of ultrahigh 6D-brightness beams.

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Section: Discussionmentioning

confidence: 99%

Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams

et al. 2017

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“…Using Eqs. (4), (16), (18) and (19), we estimate the current sensitivities of GEO 600 [13,14] and the Fermilab holometer using both of its co-located interferometers [15,16] to the linear interactions of the DM field φ with the photon and electron in (1). We present these estimates as solid lines in Fig.…”

Section: B Michelson Interferometers (Geo 600 Fermilab Holometer)mentioning

confidence: 99%

“…In this case, some of the common-mode suppression would be lifted due to the maximally different mass-energy contributions of elements from different regions of the periodic table, see Eq. (15). Using Eqs.…”

Section: E Space-based Experiments (Lisa)mentioning

confidence: 99%

“…Searches for coherently oscillating classical DM fields share similarities with searches for continuous as well as for stochastic gravitational waves, while searches for domain-wall objects share similarities with searches for gravitational-wave bursts. Based on our estimates, we emphasise that existing laser interferometers, particularly the GEO 600 Michelson interferometer [13,14], al- [13,14] and the Fermilab holometer [15,16]. Dual recycling denotes the combination of power recycling and signal recycling.…”

Section: Introductionmentioning

confidence: 98%

“…Laser interferometry has been optimised over decades to develop ultra-sensitive gravitational-wave detectors, which have recently been employed spectacularly to directly observe gravitational waves on Earth for the first time [20,21]. Additionally, smaller-scale interferometers have more recently been utilised to search for non-gravitational-wave phenomena, such as quantumgeometry effects that may arise at the Planck scale [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Novel signatures of dark matter in laser-interferometric gravitational-wave detectors

Grote

Stadnik

2019

Phys. Rev. Research

135

117

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Dark matter may induce apparent temporal variations in the physical "constants", including the electromagnetic fine-structure constant and fermion masses. In particular, a coherently oscillating classical dark-matter field may induce apparent oscillations of physical constants in time, while the passage of macroscopic dark-matter objects (such as topological defects) may induce apparent transient variations in the physical constants. In this paper, we point out several new signatures of the aforementioned types of dark matter that can arise due to the geometric asymmetry created by the beam-splitter in a two-arm laser interferometer. These new signatures include dark-matter-induced time-varying size changes of a freely-suspended beam-splitter and associated time-varying shifts of the main reflecting surface of the beam-splitter that splits and recombines the laser beam, as well as time-varying refractive-index changes in the freely-suspended beam-splitter and time-varying size changes of freely-suspended arm mirrors. We demonstrate that existing ground-based experiments already have sufficient sensitivity to probe extensive regions of unconstrained parameter space in models involving oscillating scalar dark-matter fields and domain walls composed of scalar fields. In the case of oscillating dark-matter fields, Michelson interferometers -in particular, the GEO 600 detector -are especially sensitive. The sensitivity of Fabry-Perot-Michelson interferometers, including LIGO, VIRGO and KAGRA, to oscillating dark-matter fields can be significantly increased by making the thicknesses of the freely-suspended Fabry-Perot arm mirrors different in the two arms. Not-too-distantly-separated laser interferometers can benefit from cross-correlation measurements in searches for effects of spatially coherent dark-matter fields. In addition to broadband searches for oscillating dark-matter fields, we also discuss how small-scale Michelson interferometers could be used to perform resonant narrowband searches for oscillating dark-matter fields with enhanced sensitivity to dark matter. Finally, we discuss the possibility of using future space-based detectors, such as LISA, to search for dark matter via time-varying size changes of and time-varying forces exerted on freely-floating test masses.

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Fundamentals and Applications of Hybrid LWFA-PWFA

Hidding¹,

Beaton²,

Boulton³

et al. 2019

Springer Proceedings in Physics

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Fundamental similarities and differences between laser-driven plasma wakefield acceleration (LWFA) and particle-driven plasma wakefield acceleration (PWFA) are discussed. The complementary features enable the conception and development of novel hybrid plasma accelerators, which allow previously not accessible compact solutions for high quality electron bunch generation and arising applications. Very high energy gains can be realized by electron beam drivers even in single stages because PWFA is practically dephasing-free and not diffraction-limited. These electron driver beams for PWFA in turn can be produced in compact LWFA stages. In various hybrid approaches, these PWFA systems can be spiked with ionizing laser pulses to realize tunable and high-quality electron sources via optical density downramp injection (also known as plasma torch) or plasma photocathodes (also known as Trojan Horse) and via wakefield-induced injection (also known as WII). These hybrids can act as beam energy, brightness and quality transformers, and partially have built-in stabilizing features. They thus offer compact pathways towards beams with unprecedented emittance and brightness, which may have transformative impact for light sources and photon science applications. Furthermore, they allow the study of PWFA-specific challenges in compact setups in addition to large linac-based facilities, such as fundamental beam-plasma interaction physics, to develop novel diagnostics, and to develop contributions such as ultralow emittance test beams or other building blocks and schemes which support future plasma-based collider concepts.

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Collective Deceleration of Laser-Driven Electron Bunches

Cited by 32 publications

References 37 publications

Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams

Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams

Novel signatures of dark matter in laser-interferometric gravitational-wave detectors

Fundamentals and Applications of Hybrid LWFA-PWFA

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