| Abstract | The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) project under construction at SLAC. The injector section, from drive-laser and RF photocathode gun through the first bunch compressor chicane, was commissioned in the spring and summer of 2007. The second phase of commissioning, including the second bunch compressor chicane and various main linac modifications, was completed in January through August of 2008. We report here on experience gained during this second phase of machine commissioning, including the injector, the first and second bunch compressor stages, the linac up to 14 GeV, and the various beam diagnostics and measurements. The final commissioning phase, including the undulator and the long transport line from the linac, is set to begin in December 2008, with first light in July 2009.
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