Coherent control of plasma dynamics

He, Zhaohan; Hou, Bixue; Lebailly, V.; Nees, J.; Krushelnick, K.; Thomas, Alexander

doi:10.1038/ncomms8156

Cited by 72 publications

(61 citation statements)

References 37 publications

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“…As the electron injection and acceleration mechanisms in plasma waves rely on a deterministic evolution of plasma dynamics30 rather than a stochastic process, it is unlikely to induce any significant temporal jitter at the electron emission. Most importantly, τ streak is the temporal resolution depending on the specific streaking geometry.…”

Section: Discussionmentioning

confidence: 99%

“…While solid density plasmas2324 or direct laser acceleration using radially polarised light2526 have been proposed as sources for ultrafast electron diffraction, to our knowledge no time-resolved electron diffraction experiments have previously been performed using a laser-plasma source. Our measurements were made possible by the development of a laser wakefield accelerator operating at kHz repetition rate with superior stability, delivering electrons in the 100 keV range2728, with the transverse coherence required for electron diffraction29 along with dramatic beam quality improvements enabled by active feedback control30.…”

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confidence: 99%

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Capturing Structural Dynamics in Crystalline Silicon Using Chirped Electrons from a Laser Wakefield Accelerator

Beaurepaire

Nees

et al. 2016

Sci Rep

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Recent progress in laser wakefield acceleration has led to the emergence of a new generation of electron and X-ray sources that may have enormous benefits for ultrafast science. These novel sources promise to become indispensable tools for the investigation of structural dynamics on the femtosecond time scale, with spatial resolution on the atomic scale. Here, we demonstrate the use of laser-wakefield-accelerated electron bunches for time-resolved electron diffraction measurements of the structural dynamics of single-crystal silicon nano-membranes pumped by an ultrafast laser pulse. In our proof-of-concept study, we resolve the silicon lattice dynamics on a picosecond time scale by deflecting the momentum-time correlated electrons in the diffraction peaks with a static magnetic field to obtain the time-dependent diffraction efficiency. Further improvements may lead to femtosecond temporal resolution, with negligible pump-probe jitter being possible with future laser-wakefield-accelerator ultrafast-electron-diffraction schemes.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Capturing Structural Dynamics in Crystalline Silicon Using Chirped Electrons from a Laser Wakefield Accelerator

Beaurepaire

Nees

et al. 2016

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“…Overall, this brings an expectation of greater than 10 9 ph/s yield, which is not as high as 10 13 ph/s permitted by large linacs [57], yet sufficient to identify considerable masses of enriched uranium within minutes [61]. From the viewpoint of laboratory practice, computerized manipulations of the phase and shape of the sub-Joule stack components, using adaptive optics and genetic algorithms [82,83], should aid greatly in practical realization of the system. This optimization approach is especially effective at a kHz-scale repetition rate and low pulse energy.…”

Section: à3mentioning

confidence: 99%

“…Then, using a kW-scale laser amplifier [77] permits the production of Joule scale pulses (LPA stack and ILP) at a few hundred Hz, increasing the photon yield beyond 10 9 ph/s. Apart from keeping the photon yield at a competitive level, this repetition rate permits real time optimization of the experiment [82,83], not possible with one shot per hour PW facilities [73].…”

Section: Final Notes On All-optical Control Of Quasi-monochromatic Thmentioning

confidence: 99%

Optically Controlled Laser-Plasma Electron Acceleration for Compact γ-Ray Sources

Kalmykov¹,

Davoine²,

Ghebregziabher³

et al. 2018

Accelerator Physics - Radiation Safety and Applications

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Thomson scattering (TS) from electron beams produced in laser-plasma accelerators may generate femtosecond pulses of quasi-monochromatic, multi-MeV photons. Scaling laws suggest that reaching the necessary GeV electron energy, with a percent-scale energy spread and five-dimensional brightness over 10 16 A/m 2 , requires acceleration in centimeter-length, tenuous plasmas (n 0 $ 10 17 cm À3 ), with petawatt-class lasers. Ultrahigh per-pulse power mandates single-shot operation, frustrating applications dependent on dosage. To generate high-quality near-GeV beams at a manageable average power (thus affording kHz repetition rate), we propose acceleration in a cavity ofelectrondensity ,drivenwithanincoherent stack of sub-Joule laser pulses through a millimeter-length, dense plasma (n 0 $ 10 19 cm À3). Blue-shifting one stack component by a considerable fraction of the carrier frequency compensates for the frequency red shift imparted by the wake. This avoids catastrophic self-compression of the optical driver and suppresses expansion of the accelerating cavity, avoiding accumulation of a massive low-energy background. In addition, the energy gain doubles compared to the predictions of scaling laws. Head-on collision of the resulting ultrabright beams with another optical pulse produces, via TS, gigawatt γ-ray pulses having a sub-20% bandwidth, over 10 6 photons in a microsteradian observation cone, and the observation cone, and the mean energy tunable up to 16 MeV.

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“…Reducing the average laser power (and peak pulse power) is the key to effectively exercise such control. 51 Maintaining GeV-scale energy and low emittance at a 10 TW-scale laser pulse power require raising the acceleration gradient to a 10 GV/cm level. Acceleration in the blowout regime, in dense, highly dispersive plasmas (n 0 $ 10 19 cm À3 ) naturally affords this gradient, with added benefits of pulse self-guiding and electron self-injection.…”

Section: Electron Energy Combs From a Plasma Channelmentioning

confidence: 99%

Optical control of electron phase space in plasma accelerators with incoherently stacked laser pulsesa)

et al. 2015

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It is demonstrated that synthesizing an ultrahigh-bandwidth, negatively chirped laser pulse by incoherently stacking pulses of different wavelengths makes it possible to optimize the process of electron self-injection in a dense, highly dispersive plasma (n 0 $ 10 19 cm À3 ). Avoiding transformation of the driving pulse into a relativistic optical shock maintains a quasi-monoenergetic electron spectrum through electron dephasing and boosts electron energy far beyond the limits suggested by existing scaling laws. In addition, evolution of the accelerating bucket in a plasma channel is shown to produce a background-free, tunable train of femtosecond-duration, 35-100 kA, time-synchronized quasi-monoenergetic electron bunches. The combination of the negative chirp and the channel permits acceleration of electrons beyond 1 GeV in a 3 mm plasma with 1.4 J of laser pulse energy, thus offering the opportunity of high-repetition-rate operation at manageable average laser power. V C 2015 AIP Publishing LLC. [http://dx.

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Coherent control of plasma dynamics

Cited by 72 publications

References 37 publications

Capturing Structural Dynamics in Crystalline Silicon Using Chirped Electrons from a Laser Wakefield Accelerator

Capturing Structural Dynamics in Crystalline Silicon Using Chirped Electrons from a Laser Wakefield Accelerator

Optically Controlled Laser-Plasma Electron Acceleration for Compact γ-Ray Sources

Optical control of electron phase space in plasma accelerators with incoherently stacked laser pulsesa)

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