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View article: Attosecond X-Ray Core-Level Chronoscopy of Aromatic Molecules
Attosecond X-Ray Core-Level Chronoscopy of Aromatic Molecules Open
Attosecond photoemission or photoionization delays are a unique probe of the structure and the electronic dynamics of matter. However, the spectral congestion of valence photoelectron spectra sets fundamental limits to the complexity of sy…
View article: Nonlinear reversal of photo-excitation on the attosecond time scale improves ultrafast x-ray diffraction images
Nonlinear reversal of photo-excitation on the attosecond time scale improves ultrafast x-ray diffraction images Open
The advent of isolated and intense sub-femtosecond X-ray pulses enables tracking of quantummechanical motion of electrons in molecules and solids. The combination of X-ray spectroscopy and diffraction imaging is a powerful approach to visu…
View article: Experimental demonstration of attosecond hard X-ray pulses
Experimental demonstration of attosecond hard X-ray pulses Open
We present the first direct experimental confirmation of attosecond pulse generation in the hard X-ray regime with a free-electron laser. Our experiment is based on measurements of a nonlinear optical phenomenon known as amplified spontane…
View article: Nanofocused attosecond hard x-ray free-electron laser with intensity exceeding 10<sup>19</sup> W/cm<sup>2</sup>
Nanofocused attosecond hard x-ray free-electron laser with intensity exceeding 10<sup>19</sup> W/cm<sup>2</sup> Open
Attosecond hard x-ray pulses from the LCLS are focused to nanometer-sized spots using an advanced Kirkpatrick-Baez mirror system. Peak intensity at the focal point exceeds 10 19 W/cm 2 , enabling a suite of damage-free nonlinear x-ray spec…
View article: Probing Electronic Coherence between Core-Level Vacancies at Different Atomic Sites
Probing Electronic Coherence between Core-Level Vacancies at Different Atomic Sites Open
The detailed understanding of electronic coherence in quantum systems requires measurements on the attosecond timescale. Attosecond x-ray pulses enable the study of electronic coherence in core-excited molecular systems. Here we report on …
View article: “Beam à la carte”: Laser heater shaping for attosecond pulses in a multiplexed x-ray free-electron laser
“Beam à la carte”: Laser heater shaping for attosecond pulses in a multiplexed x-ray free-electron laser Open
Electron beam shaping allows the control of the temporal properties of x-ray free-electron laser pulses from femtosecond to attosecond timescales. Here, we demonstrate the use of a laser heater to shape electron bunches and enable the gene…
View article: Attosecond Coherent Electron Motion in a Photoionized Aromatic Molecule
Attosecond Coherent Electron Motion in a Photoionized Aromatic Molecule Open
In molecular systems, the ultrafast motion of electrons initiates the process of chemical change. Tracking this electronic motion across molecules requires coupling attosecond time resolution to atomic-scale spatial sensitivity. In this wo…
View article: "Beam `a la carte": laser heater shaping for attosecond pulses in a multiplexed x-ray free-electron laser
"Beam `a la carte": laser heater shaping for attosecond pulses in a multiplexed x-ray free-electron laser Open
Electron beam shaping allows the control of the temporal properties of x-ray free-electron laser pulses from femtosecond to attosecond timescales. Here we demonstrate the use of a laser heater to shape electron bunches and enable the gener…
View article: Spectrotemporal shaping of attosecond x-ray pulses with a fresh-slice free-electron laser
Spectrotemporal shaping of attosecond x-ray pulses with a fresh-slice free-electron laser Open
We propose a scheme allowing coherent shaping, i.e., controlling both the amplitude and phase, of attosecond x-ray pulses at free-electron lasers. We show that by seeding an FEL with a short coherent seed that overfills the amplification b…
View article: Attosecond X-ray Core-level Chronoscopy of Aromatic Molecules
Attosecond X-ray Core-level Chronoscopy of Aromatic Molecules Open
Attosecond photoemission or photoionization delays are a unique probe of the structure and the electronic dynamics of matter. However, spectral congestion and spatial delocalization of valence electron wave functions set fundamental limits…
View article: Experimental Demonstration of Attosecond Pump-Probe Spectroscopy with an X-ray Free-Electron Laser
Experimental Demonstration of Attosecond Pump-Probe Spectroscopy with an X-ray Free-Electron Laser Open
Pump-probe experiments with sub-femtosecond resolution are the key to understanding electronic dynamics in quantum systems. Here we demonstrate the generation and control of sub-femtosecond pulse pairs from a two-colour X-ray free-electron…
View article: The Linac Coherent Light Source II photoinjector laser infrastructure
The Linac Coherent Light Source II photoinjector laser infrastructure Open
This paper presents a comprehensive technical overview of the Linac Coherent Light Source II (LCLS-II) photoinjector laser system, its first and foremost component. The LCLS-II photoinjector laser system serves as an upgrade to the origina…
View article: Efficient prediction of attosecond two-colour pulses from an X-ray free-electron laser with machine learning
Efficient prediction of attosecond two-colour pulses from an X-ray free-electron laser with machine learning Open
X-ray free-electron lasers are sources of coherent, high-intensity X-rays with numerous applications in ultra-fast measurements and dynamic structural imaging. Due to the stochastic nature of the self-amplified spontaneous emission process…
View article: Comparison of multiobjective optimization methods for the $\\mathrm{LCLS-II}$ photoinjector
Comparison of multiobjective optimization methods for the $\\mathrm{LCLS-II}$ photoinjector Open
Particle accelerators are among some of the largest science experiments in the world and can consist of thousands of components with a wide variety of input ranges. These systems can easily become unwieldy optimization problems during desi…
View article: The LCLS-II Photoinjector Laser Infrastructure
The LCLS-II Photoinjector Laser Infrastructure Open
This paper presents a comprehensive technical overview of the Linac Coherent Light Source II (LCLS-II) photoinjector laser system, its first and foremost component. The LCLS-II photoinjector laser system serves as an upgrade to the origina…
View article: Electron beam shaping via laser heater temporal shaping
Electron beam shaping via laser heater temporal shaping Open
Active longitudinal beam optics can help FEL facilities achieve cutting edge performance by optimizing the beam to: produce multi-color pulses, suppress caustics, or support attosecond lasing. As the next generation of superconducting acce…
View article: Deep learning reconstruction of attosecond X-ray pulses from an angularly streaked 2D photoelectron momentum distribution
Deep learning reconstruction of attosecond X-ray pulses from an angularly streaked 2D photoelectron momentum distribution Open
The Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory produces intense X-ray pulses using a beam of accelerated electrons. The X-ray laser enhanced attosecond pulse generation (XLEAP) project at SLAC has enabled LC…
View article: Development of Hyperthermia Measurable Fiber Radiometric Thermometer for Monitoring Tissue Temperature during Thermo-therapy
Development of Hyperthermia Measurable Fiber Radiometric Thermometer for Monitoring Tissue Temperature during Thermo-therapy Open
Temperature monitoring is extremely im-portant during thermotherapy. Fiber-optic temperature sensors are preferred because of their flexibility and im-munity to electromagnetic interference. Although many types of fiber-optic sensors have …
View article: Detection of blackbody radiation during fiber guided laser-tissue vaporization
Detection of blackbody radiation during fiber guided laser-tissue vaporization Open
Laser-tissue vaporization through a fiber catheter is evolving into a major category of surgical operations to remove diseased tissue. Currently, during a surgery, the surgeon still relies on personal experience to optimize surgical techni…
View article: Small-strip thin gap chambers wedge-0 testbeam
Small-strip thin gap chambers wedge-0 testbeam Open
The Large Hadron Collider (LHC) at CERN will undergo an extensive luminosity upgrade with the goal of extending sensitivity to study new physics in the multi-TeV range. The current forward muon-tracking detectors of the Muon Spectrometer o…