9 research outputs found
The LCLS-II Photoinjector Laser Infrastructure
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
original LCLS at SLAC National Accelerator Laboratory. This advanced laser
system generates high-quality laser beams to power the LCLS-II, contributing to
the instrument's unprecedented brightness, precision, and flexibility. Our
discussion extends to the various subsystems that comprise the photoinjector,
including the photocathode laser, laser heater, and beam transport systems.
Lastly, we draw attention to the ongoing research and development
infrastructure underway to enhance the functionality and efficiency of the
LCLS-II, and similar X-ray free-electron laser facilities around the world,
thereby contributing to the future of laser technology and its applications.Comment: Submitted to High Power Laser Science and Engineerin
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Femtosecond Operation of the LCLS for User Experiments
In addition to its normal operation at 250pC, the LCLS has operated with 20pC bunches delivering X-ray beams to users with energies between 800eV and 2 keV and with bunch lengths below 10 fs FWHM. A bunch arrival time monitor and timing transmission system provide users with sub 50 fs synchronization between a laser and the X-rays for pump/probe experiments. We describe the performance and operational experience of the LCLS for short bunch experiments
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Surface Characterization of the LCLS RF Gun Cathode
The first copper cathode installed in the LCLS RF gun was used during LCLS commissioning for more than a year. However, after high charge operation (> 500 pC), the cathode showed a decline of quantum efficiency within the area of drive laser illumination. They report results of SEM, XPS and XAS studies that were carried out on this cathode after it was removed from the gun. X-ray absorption and X-ray photoelectron spectroscopy reveal surface contamination by various hydrocarbon compounds. In addition they report on the performance of the second installed cathode with emphasis on the spatial distribution of electron emission