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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: 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: Tunable x-ray free electron laser multi-pulses with nanosecond separation
Tunable x-ray free electron laser multi-pulses with nanosecond separation Open
X-ray Free Electron Lasers provide femtosecond x-ray pulses with narrow bandwidth and unprecedented peak brightness. Special modes of operation have been developed to deliver double pulses for x-ray pump, x-ray probe experiments. However, …
View article: Two- and Multi-bucket X-ray Free-Electron Laser at LCLS
Two- and Multi-bucket X-ray Free-Electron Laser at LCLS Open
X-ray Free Electron Lasers provide femtosecond X-ray pulses with narrow bandwidth and unprecedented peak brightness. Special modes of operation have been developed to deliver double pulses for X-ray pump, X-ray probe experiments. However, …
View article: Commissioning of the SLAC Linac Coherent Light Source II electron source
Commissioning of the SLAC Linac Coherent Light Source II electron source Open
For the Linac Coherent Light Source II (LCLS-II) project at SLAC, a 1.3 GHz superconducting rf (SRF) linac is being constructed that will generate 4 GeV electron bunches at a high repetition rate to drive x-ray free electron lasers. The LC…
View article: Effect of X-ray free-electron laser-induced shockwaves on haemoglobin microcrystals delivered in a liquid jet
Effect of X-ray free-electron laser-induced shockwaves on haemoglobin microcrystals delivered in a liquid jet Open
X-ray free-electron lasers (XFELs) enable obtaining novel insights in structural biology. The recently available MHz repetition rate XFELs allow full data sets to be collected in shorter time and can also decrease sample consumption. Howev…
View article: Observation of shock-induced protein crystal damage during megahertz serial femtosecond crystallography
Observation of shock-induced protein crystal damage during megahertz serial femtosecond crystallography Open
Shock waves launched by x-ray pulses in sample-carrying liquid jets may affect protein crystallography data collected at MHz repetition rate x-ray free-electron laser (XFEL) facilities, by damaging the crystals before they are probed. We i…
View article: Initial Operation of the LCLS-II Electron Source
Initial Operation of the LCLS-II Electron Source Open
The Early Injector Commissioning program for LCLS-II aims to demonstrate CW electron beam production this year in the first two meters of the injector that includes the room-temperature 185.7 MHz single-cell gun and the 1.3 GHz two-cell bu…
View article: Two and Multiple Bunches at LCLS
Two and Multiple Bunches at LCLS Open
The LCLS X-Ray FEL at SLAC typically delivers one bunch at the time. Different schemes of two pulses have been developed: Two bucket, Twin bunch, split undulator, and fresh slice. Here we discuss a four bunch or even eight bunch setup, whe…
View article: Ultraviolet laser transverse profile shaping for improving x-ray free electron laser performance
Ultraviolet laser transverse profile shaping for improving x-ray free electron laser performance Open
The photocathode rf gun is one of the most critical components in x-ray free electron lasers. The drive laser strikes the photocathode surface, which emits electrons with properties that depend on the shape of the drive laser. Most free el…
View article: LCLS Injector Laser Shaping and Applications
LCLS Injector Laser Shaping and Applications Open
In the Linear Coherent Light Source (LCLS) at SLAC, the injector laser plays an important role as the source of the electron beam for the Free Electron Laser (FEL). The beam emittance and FEL performance are highly related to the transvers…
View article: LCLS Injector Laser Profile Shaping Using Digital Micromirror Device
LCLS Injector Laser Profile Shaping Using Digital Micromirror Device Open
In the Linear Coherent Light Source (LCLS) at SLAC, the injector laser plays an important role as the source of the electron beam for the Free Electron Laser (FEL). The emittance of the beam is highly related to the transverse profile of t…
View article: Evaluation of FEL Performance with a Longer Injector Drive Laser Pulse at the LCLS
Evaluation of FEL Performance with a Longer Injector Drive Laser Pulse at the LCLS Open
It is known that the X-ray Free Electron Laser (FEL) performance strongly depends on the beam emittance and peak current. Lengthening injector laser pulse can improve the injector emittance but the injector peak current is notably compromi…
View article: Optical Shaping of X-Ray Free-Electron Lasers
Optical Shaping of X-Ray Free-Electron Lasers Open
In this Letter we report the experimental demonstration of a new temporal shaping technique for x-ray free-electron lasers (FELs). This technique is based on the use of a spectrally shaped infrared (IR) laser and allows optical control of …
View article: Twin-bunch Two-colour FEL at LCLS
Twin-bunch Two-colour FEL at LCLS Open
Twin electron bunches have been the subject of much investigation at the Linac Coherent Light Source, due to their many applications to X-ray free-electron lasers (X-FEL). Twin bunches are trains of two electron bunches that are accelerate…