SLAC, a two-mile particle accelerator jutting west from Stanford University, pushes
electrons near the speed of light. Back when it was still called the Stanford Linear Accelerator, SLAC was used for seminal particle physics discoveries decades ago.
It's now called the SLAC National Accelerator Laboratory, and its newer mission turns electrons into powerful X-ray lasers at a facility called LCLS (Linac Coherent Light Source). This tunnel links the two LCLS experimental chambers, with X-rays coasting along through the pipes after being generated upstream at a structure called the undulator. https://www.cnet.com/pictures/slac-a-2-mile-particle-accelerator-next-to-stanford/
