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Stanford Linear Accelerator Center (SLAC) is a national accelerator laboratory operated by Stanford University for the U.S. Department of Energy. It is located in Menlo Park, California, and is home to the world's longest linear accelerator, which is used to study the fundamental particles that make up matter and the forces that act between them. SLAC is also a major center for research in astrophysics, photon science, and other fields.