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Scientists at the Fermi National Accelerator Laboratory (Fermilab) are working on research projects that aim to answer fundamental physics questions. How did the universe begin? What are dark matter and dark energy? What is the mass hierarchy of neutrinos? Are there other undiscovered particles beyond the currently known Standard Model of Particle Physics?

To address these questions, Fermilab—the premier high-energy particle physics laboratory in the United States—operates some of the world’s most advanced particle accelerators. Fermilab’s 6,800-acre facility is located in Batavia, Illinois, and its particle accelerator chain—with a total length of more than 10 miles—resides in tunnels 25 ft or more below ground.

Fig 1: Fermilab’s accelerator chain lies 25 ft below ground and includes more than 10 miles of tunnels.

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