Skip to main content

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.


Effective November 22: Argonne requires vaccinations or employer exemptions for ATLAS user site access

Argonne National Laboratory is committed to helping protect the health and safety of those who visit our site. Argonne and the Argonne Tandem Linac Accelerator System (ATLAS) remain in a limited state of operations. However, starting November 22, 2021, Argonne National Laboratory will change its requirements for site access and all ATLAS users will only be able to enter the laboratory site if they: 

  • Provide proof of COVID-19 vaccination; or 
  • Provide proof that they have received an exemption from their employer or home institution, allowing them to remain unvaccinated. In this case, users will need to provide proof that they are enrolled in a COVID-19 screening program through their employer that tests at least weekly, or provide a negative result from a COVID-19 test conducted within the last 72 hours. 

    This change means that unvaccinated users will no longer be able to access the Argonne campus or the ATLAS facility with only a negative COVID-19 test result.

The laboratory will continue to update its site access policies based on the evolution of the COVID-19 pandemic.

If you have additional questions, please contact the ATLAS User Office at atlas-​admin@​anl.​gov.


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. 


ATLAS General Inquiries (users and visitors)

ATLAS Experiment Inquiries

ATLAS Schedule Inquiries
Link Subscribe to receive ATLAS news and updates

ATLAS Schedule & Calendar

The ATLAS calendar shows events relevant to our user community including scheduled experiments, major maintenance operations and shutdown periods.

View ATLAS Calendar

Submit a critical beam change request

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.


Exploring the Argonne Tandem Linac Accelerator System (ATLAS)

ATLAS enables pioneering research into our understanding of matter, nuclear forces and the origin of the elements.



With an unwavering focus on our mission, our researchers take an interdisciplinary approach to research, advancing their fields of study and generating new knowledge for the benefit of future generations.