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2021
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 LCLS-II electron source, which comprises the first three meters of the electron injector, includes two normal-conducting, continuous-wave rf cavities: a one-cell, 185.7 MHz gun and a two-cell, 1.3 GHz buncher. It also includes a gun load-lock system that allows photocathodes to be changed under vacuum. The components in this beam-line section were designed and built by Lawrence Berkeley National Laboratory based on experience from their advanced photoinjector experiment program. In combination with the SLAC UV laser system, the electron source is designed to produce beam rates up to 1 MHz with average currents up to $30\text{ }\text{ }\ensuremath{\mu}\mathrm{A}$ initially. The source was installed in mid-2018, well in advance of the SRF linac, which ...
The Linac Coherent Light Source is a SASE x-ray free-electron laser (FEL) project presently under construction at SLAC [J. Arthur et al., SLAC-R-593, 2002.]. The injector section, from drive laser and rf photocathode gun through first bunch compressor chicane, was installed in the fall of 2006. The initial system commissioning with an electron beam was completed in August of 2007, with the goal of a 1.2- micron emittance in a 1-nC bunch demonstrated. The second phase of commissioning, including second bunch compressor and full linac, is planned for 2008, with FEL commissioning in 2009. We report experimental results and experience gained in the first phase of commissioning, including the photocathode drive laser, rf gun, photocathode, S-band and X-band rf systems, first bunch compressor, and the various beam diagnostics.
2004 •
The Linac Coherent Light Source at the SLAC National Accelerator Laboratory (operated by Stanford University for the US Department of Energy) is the world's first hard X-ray Free Electron Laser machine. It uses high energy electrons delivered by a linac to create ultrafast and brilliant X-ray pulses that can be used as a 'high-speed' camera to obtain images of atoms and molecules. LCLS is a pioneer machine and, as such, its design has encountered unprecedented challenges, the solutions to which will benefit future facilities of its kind across the globe. This article describes the radiation protection aspects of LCLS electron beamlines. Special emphasis is put on the successful commissioning of the LCLS electron line, where, for all examined loss sources, the measured prompt and residual dose rates are in agreement with or below the values predicted through detailed Monte Carlo simulations, used earlier to design the shielding.
2007 IEEE Particle Accelerator Conference (PAC)
Results of the SLAC LCLS gun high-power RF tests2007 •
arXiv: Accelerator Physics
Commissioning and Operation of FAST Electron Linac at Fermilab2018 •
We report results of the beam commissioning and first operation of the 1.3 GHz superconducting RF electron linear accelerator at Fermilab Accelerator Science and Technology (FAST) facility. Construction of the linac was completed and the machine was commissioned with beam in 2017. The maximum total beam energy of about 300 MeV was achieved with the record energy gain of 250 MeV in the ILC-type SRF cryomodule. The photoinjector was tuned to produce trains of 200 pC bunches with a frequency of 3 MHz at a repetition rate of 1 Hz. This report describes the aspects of machine commissioning such as tuning of the SRF cryomodule and beam optics optimization. We also present highlights of an experimental program carried out parasitically during the two-month run, including studies of wake-fields, and advanced beam phase space manipulation.
2010 •
The Linac Coherent Light Source (LCLS) X-ray free electron laser project is currently under construction at the Stanford Linear Accelerator Center (SLAC). A new injector and upgrades to the existing accelerator were installed in two phases in 2006 and 2007. We report on the commissioning of the injector, the two new bunch compressors at 250MeV and 4.3 GeV, and transverse
2023 •
2015 •
2024 •
Journal of Pediatric Urology
Bladder calculi in the augmented bladder: A follow-up study of 160 children and adolescents2015 •
2016 •
Rosa dos Ventos
Acessibilidade Virtual em Destinos Turísticos Inteligentes: Os Casos de Curitiba [Brasil] e Málaga [Espanha]2021 •
2020 ASEE Virtual Annual Conference Content Access Proceedings
The Places They Will Go: What Happens When Engineering Students Critically ReflectChemischer Informationsdienst
ChemInform Abstract: TERPENES. CCLXVII. DIETHYLAMINE ADDITION TO NATURAL SESQUITERPENIC α‐EXOMETHYLENE‐Γ‐LACTONES AND ITS USE FOR CHEMICAL TRANSFORMATIONS OF THESE COMPOUNDS1983 •
Global Biosecurity
Keeping in-school adolescents safe from COVID-19 sequelae to the suspension of school lockdown restriction2020 •
Geophysical Research Letters
Low friction along the high slip patch of the 2011 Mw 9.0 Tohoku‐Oki earthquake required from the wedge structure and extensional splay faults2013 •
2017 •
SSRN Electronic Journal
Country Stress Events: Does Governance Matter?