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Announcement | Argonne Tandem Linac Accelerator System

Current ATLAS User Facility Access


As of Wednesday, May 3, 2023, all Argonne National Laboratory site visitors who are 18 years old or older, including users of the Argonne Tandem Linac Accelerator System (ATLAS), must show identification compliant with the REAL ID Act to enter all Argonne sites. Users will need to present identification at the Argonne Information Center during business hours (6:30 a.m. to 5 p.m.) or to a Protective Force officer at the North Gate entrance after hours. Users only need to present a REAL ID or acceptable documentation one time to be verified. Argonne will log each person’s verification and keep it on record.

This updated identification policy puts Argonne in compliance with the REAL ID Act, passed by the U.S. Congress in 2005, which establishes minimum security standards for people accessing federal facilities. Please note that, although the Department of Homeland Security extended the deadline for REAL ID compliance for boarding an aircraft to May 7, 2025, Argonne will require updated identification for users to access all sites on May 3, 2023.

Details on compliant documents are available online. Please contact the ATLAS User Office at atlas-​admin@​anl.​gov if you have questions.

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