![SLAC on tap promo with Arianna Gleason](/sites/default/files/styles/card/public/2024-04/slac_on_tap_1_2024_graphic_portrait_1.jpg?h=b21c77cf&itok=U03DJOrv)
LCLS is the world’s first hard X-ray free-electron laser, open to experiments by scientists from across the globe.
![New undulator hall](/sites/default/files/styles/card/public/2020_0306_Empty_Undulator_Hall_Gamazo-7843.jpg?h=56d0ca2e&itok=imB3yCp_)
Photograph
SLAC staff gather in the accelerator control room to celebrate first light produced by the LCLS-II project’s pioneering superconducting accelerator.
![First light celebration](/sites/default/files/styles/card/public/2023-09/2023_0914_LCLS_II_First_Light_Celebration_Boyes-1-1180x726.jpg?h=2f3e7035&itok=GtVa1TtM)
Illustration
SLAC’s newly upgraded Linac Coherent Light Source (LCLS) X-ray free-electron laser (XFEL) successfully produced its first X-rays, creating unparalleled capabilities that will usher in...
![LCLS-II first light](/sites/default/files/styles/card/public/2023-09/lclsII_first_light_pr_la_final.jpg?h=afe87940&itok=3yli8my-)