Qualla: Thomas Jefferson National Accelerator Facility

Thomas Jefferson National Accelerator Facility: Introduction

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit doe-oakridge, Public domain. Somewhere beneath the suburban lawns and strip malls of Newport News, Virginia, electrons race through a seven-eighths-mile loop at nearly the speed of light, slamming into targets so physicists can study what protons and neutrons are actually made of. The Thomas Jefferson National Accelerator Facility - Jefferson Lab, or just JLab to the people who work there - does not look like much from above. No dramatic cooling towers, no gleaming domes. The accelerator sits 25 feet underground, inside tunnels with walls two feet thick, shaped like a racetrack and cooled by the world's largest liquid helium refrigerator. More than 2,000 scientists from around the globe have conducted research here since it opened in the 1990s. They come to ask one of the oldest questions in physics: what holds matter together?

Image: doe-oakridge | Public domain

Thomas Jefferson National Accelerator Facility: A Linear Accelerator, Folded Like Origami

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit doe-oakridge, Public domain. CEBAF - the Continuous Electron Beam Accelerator Facility, the name that predates the Jefferson Lab branding - is an engineering marvel disguised as a racetrack. Two superconducting linear accelerators, each 1,400 meters long, sit parallel to each other, connected at both ends by...

Image: doe-oakridge | Public domain

Thomas Jefferson National Accelerator Facility: Colder Than Outer Space

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit doe-oakridge, Public domain. The accelerator's secret is superconducting radio frequency technology. Niobium cavities are cooled by liquid helium to approximately 4 Kelvin - about minus 452 degrees Fahrenheit, colder than the void between stars. At this temperature, electrical resistance vanishes entirely, a...

Image: doe-oakridge | Public domain

Thomas Jefferson National Accelerator Facility: Four Halls, Four Windows into the Nucleus

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit SshepherdTRIUMF, CC BY-SA 4.0. The electron beam terminates in four experimental halls, designated A through D, each equipped with specialized spectrometers and particle detectors. When an electron strikes a nucleus in the target, the collision scatters particles into the hall, where detector arrays track thei...

Image: SshepherdTRIUMF | CC BY-SA 4.0

Thomas Jefferson National Accelerator Facility: The $338 Million Upgrade

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit SshepherdTRIUMF, CC BY-SA 4.0. The original CEBAF achieved its design energy of 4 GeV in 1995, reached 6 GeV by 2000, and completed 178 experiments before shutting down in May 2012 for a transformative upgrade. The $338 million project doubled the beam energy to 12 GeV, added Hall D on the opposite end of the ...

Image: SshepherdTRIUMF | CC BY-SA 4.0

Thomas Jefferson National Accelerator Facility: Big Science in a Small City

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit doe-oakridge, Public domain. Jefferson Lab was established in 1984 as CEBAF, funded by the Department of Energy and built by the Southeastern Universities Research Association. Construction of the accelerator began on February 13, 1987, and the first beam reached the experimental area on July 1, 1994. The fa...

Image: doe-oakridge | Public domain