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Argonne Tandem Linac Accelerator System

The prime national facility for nuclear structure research. The Argonne Tandem Linac Accelerator System (ATLAS) is the world’s first superconducting linear accelerator for heavy ions at energies in the vicinity of the Coulomb barrier.

COVID-19 UPDATE -- July 28, 2021

Dear ATLAS User Community,

To reduce the risk of being infected with the COVID-19 Delta variant and spreading it to others, the Centers for Disease Control and Prevention (CDC) issued guidance for fully vaccinated people to wear a face covering indoors in public if they are in an area of substantial or high transmission.

Today, the U.S. Department of Energy announced that all people, including those who are vaccinated, must wear face coverings when in DOE buildings and leased spaces in areas of substantial or high community transmission.

DuPage and Will counties, two of the three we monitor as part of Argonne’s region, are experiencing substantial community transmission. As a result, effective Thursday, July 29, 2021, 12 a.m. Central Time, face coverings are again required at all Argonne facilities, regardless of an individual’s vaccination status.

You must wear a face covering in all public and work areas within a building (e.g., shared offices and labs, hallways, elevators, restrooms). Face coverings are required in all face-to-face meetings and at security checkpoints (though security may ask you to lower your face covering to verify identity). Face coverings are also required inside government-owned vehicles when another person is in the vehicle. You may remove your face covering when alone in an enclosed space or when necessary to eat, provided you are six feet away from other people. Face coverings are required outdoors only when you are within six feet of another person.

As a reminder, if you are experiencing any COVID-19-like symptoms, do not come on site, even if you are fully vaccinated. Symptoms, and their intensity, vary greatly from person to person. Though vaccines provide strong protection against severe illness, hospitalization, and death, breakthrough cases may cause mild cases that allow for person-to-person transmission.

Our priority is to keep people safe so Argonne can continue to deliver on its scientific mission through the pandemic.

We appreciate your continued adoption of COVID-19 safety protocols, especially as we adapt them to respond to changing levels of risk.


This is the energy domain best suited to study the properties of the nucleus, the core of matter and the fuel of stars. ATLAS can provide beams of essentially all stable isotopes from protons to uranium, and a variety of light radioactive beams through our in-flight production program and heavier neutron-rich isotopes from CARIBU.

ATLAS is a U.S. Department of Energy User Facility that hosts roughly 200 to 300 users each year. It is supported by the Office of Nuclear Physics of the Department of EnergyATLAS users come from U.S. universities and national laboratories as well as from foreign institutions. The facility is also accessible to industrial users. 


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A critical change is one that requires approval by ATLAS safety committees. Click button below to start request process. You will be redirected to an online form. Your request won’t be processed until you click Submit” button in the form.


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