Linac Coherent Light Source: The first five years

Bostedt, Christoph; Boutet, Sébastien; Fritz, David; Huang, Zhirong; Lee, Hae Ja; Lemke, Henrik T.; Robert, Aymeric; Schlotter, W. F.; Turner, Joshua J.; Williams, Garth J.

doi:10.1103/revmodphys.88.015007

Cited by 568 publications

(376 citation statements)

References 449 publications

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“…Studies of time-resolved electron dynamics in various atomic, molecular, and condensed-matter reactions have increased over the past two decades [1][2][3][4][5][6][7] owing to experimental progress in generating ultrashort and/or intense pulses of extreme ultraviolet light [8,9], x rays [10,11], and electrons [12,13]. These advances open the possibility of obtaining a deeper understanding of physical and chemical reaction mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Shao

Starace

2018

Phys. Rev. A

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Owing to its ability to provide unique information on electron dynamics, time-resolved electron momentum spectroscopy (EMS) is used to study theoretically a laser-driven electronic motion in atoms. Specifically, a chirped laser pulse is used to adiabatically transfer the populations of lithium atoms from the ground state to the first excited state. During this process, impact ionization near the Bethe ridge by time-delayed ultrashort, high-energy electron pulses is used to image the instantaneous momentum density of this electronic population transfer. Simulations with 100 fs and 1 fs pulse durations demonstrate the capability of EMS to image the time-varying momentum density, including its change of symmetry as the population transfer progresses. Moreover, the spectra corresponding to different pulse durations reveal different kinds of electronic motion. We discuss how to properly interpret these time-resolved EMS spectra, which represent a generalization of time-independent EMS.

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Section: Introductionmentioning

confidence: 99%

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Shao

Starace

2018

Phys. Rev. A

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“…X-ray free electron lasers (XFELs) [1][2][3][4] have opened a new frontier for x-ray science [5] and an extreme regime for light-matter interactions. Unprecedented focused intensities at ultrashort wavelengths have led to the discovery of xray phemonena such as nonlinear multiphoton absorption in atoms, molecules, and clusters [6][7][8][9][10], atomic x-ray lasing [11,12], induced transparency or saturable absorption [6,9,10,[13][14][15], stimulated emission [16][17][18], and second harmonic generation [19].…”

Section: Introductionmentioning

confidence: 99%

Atomistic three-dimensional coherent x-ray imaging of nonbiological systems

Knight

Tegze

et al. 2016

Phys. Rev. A

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We computationally study the resolution limits for three-dimensional coherent x-ray diffractive imaging of heavy, nonbiological systems using Ar clusters as a prototype. We treat electronic and nuclear dynamics on an equal footing and remove the frozen-lattice approximation often used in electronic damage studies. We explore the achievable resolution as a function of pulse parameters (fluence level, pulse duration, and photon energy) and particle size. The contribution of combined lattice and electron dynamics is not negligible even for 2 fs pulses, and the Compton scattering is less deleterious than in biological systems for atomic-scale imaging. Although free-electron scattering represents a significant background, we find that recovery of the original structure is in principle possible with 3Å resolution for particles of 11 nm diameter.

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“…X-ray synchrotron radiation sources have become immensely useful tools for basic science and broad applications in biology and materials science. 1 State-of-the-art synchrotrons and free-electron lasers 2,3 based on a radiofrequency accelerator can now produce x-ray sources with unprecedented photon flux and brilliance but have hitherto been limited to huge facilities which are costly and only accessible to limited users. Over the past decade, a more compact accelerator based on the concept of laser-driven wakefield acceleration 4 has achieved significant progress in generating GeV-class electron beams (e beams), [5][6][7][8][9][10][11] which holds the great potential of becoming a better candidate to produce compact femtosecond x-and c-ray sources.…”

mentioning

confidence: 99%

Enhanced betatron radiation by steering a laser-driven plasma wakefield with a tilted shock front

Liu

Wang

et al. 2018

Applied Physics Letters

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We have experimentally realized a scheme to enhance betatron radiation by manipulating transverse oscillation of electrons in a laser-driven plasma wakefield with a tilted shock front (TSF). Very brilliant betatron x-rays have been produced with significant enhancement both in photon yield and peak energy but almost maintain the e-beam energy spread and charge. Particle-in-cell simulations indicate that the accelerated electron beam (e beam) can acquire a very large transverse oscillation amplitude with an increase in more than 10-fold, after being steered into the deflected wakefield due to the refraction of the driving laser at the TSF. Spectral broadening of betatron radiation can be suppressed owing to the small variation in the peak energy of the low-energy-spread e beam in a plasma wiggler regime. It is demonstrated that the e-beam generation, refracting, and wiggling can act as a whole to realize the concurrence of monoenergetic e beams and bright x-rays in a compact laser-wakefield accelerator.

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Linac Coherent Light Source: The first five years

Cited by 568 publications

References 449 publications

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Atomistic three-dimensional coherent x-ray imaging of nonbiological systems

Enhanced betatron radiation by steering a laser-driven plasma wakefield with a tilted shock front

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