Abstract
The Linac Coherent Light Source (LCLS) is the world’s first hard X-ray free-electron laser. First proposed in 1992, the LCLS concept immediately attracted the interest of accelerator physicists in the synchrotron light source community. Interest among x-ray researchers grew slowly until about 1996, when scientists at DESY produced a concept for a large x-ray laser research facility (now the European XFEL). The US Department of Energy (DOE) conducted formal assessments of the science potential of accelerator-based x-ray lasers between 1992 and 2001 when DOE officially acknowledged that such a device should be built. The DOE assessments and their conclusions demonstrate how a young researcher can have a preview, over seven years in advance, of important new science facilities and their capabilities. In 2002, SLAC National Accelerator Laboratory prepared a conceptual design of LCLS. By this time, the LCLS concept had grown from a minimum-cost test to a versatile facility supporting the research of thousands of x-ray experimenters. Groundbreaking for construction of LCLS began in 2006, and first lasing at 8 keV was observed in April 2009. This chapter describes some of the most significant physics and engineering problems and solutions: performance of the electron source, such as the potential deleterious effects of coherent synchrotron radiation instabilities, precision control of magnetic fields in the undulators.
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Acknowledgements
I consider myself extremely fortunate to have had the privilege of working on LCLS with the authors of most of the references listed here. I am grateful beyond words for the opportunity to summarize their work in this chapter. I hope I will be forgiven for any omissions or oversimplifications in this report.
I am very grateful to J. Goldstein for editing this chapter.
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Galayda, J. (2015). The Linac Coherent Light Source: Concept Development and Design Considerations. In: Jaeschke, E., Khan, S., Schneider, J., Hastings, J. (eds) Synchrotron Light Sources and Free-Electron Lasers. Springer, Cham. https://doi.org/10.1007/978-3-319-04507-8_35-1
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