Advanced Photon Source

An Office of Science National User Facility

Argonne Site Access

Argonne National Laboratory is a controlled-access facility. You will need a visitor’s pass or a user badge to enter the Argonne campus. PLEASE NOTE: A reservation at the Argonne Guest House does NOT guarantee your site access!

You must notify us of your visit in advance. When you arrive, you will be asked to present your identification documents, and then you will be given your pass or badge. You can then come and go freely during the period your pass or badge is valid. You must wear your pass or badge visibly at all times while on site. Do not wear your badge while offsite and never permit your badge to be photographed or filmed.

See Visiting the APS for travel, lodging, and amenities information.

Important: Please ensure that you have received all necessary confirmations from the User Office before you travel to Argonne.

Site Access for On-site Users

An on-site user is an individual who conducts hands-on work at the APS

  1. Register at the user registration login to receive a badge number.
  2. Notify the APS of your arrival/departure dates via My APS Portal ("check-in" tab, APS badge number required).
  3. Verify you are covered by a user agreement between your institution and APS.
  4. Obtain and bring the appropriate identification documents.
  5. Complete training listed in your profile in My APS Portal (APS badge number required).
  6. Report to the visitor center to get your user badge (if arriving before 8 a.m. or after 5 p.m., go to main gate for gate pass).
  7. Proceed to APS User Office (Building 401, reception desk) to have a new user badge activated (hours 7:30 a.m. to 5:00 p.m.).

Tips: See User Access Myths Debunked for some common errors and how to avoid them.

Site Access for Non-experimenter Visitors

A visitor is an individual who requires short-term site access and will NOT conduct hands-on work (e.g., a meeting speaker, family member, traveling companion, conference/workshop attendee, tour group member).

  1. Visitors of APS/Argonne employees must register using the Argonne Visitor Form
  2. All other visitors (e.g., collaborative access team visitors and guests) must register using the APS Visitor Form.
  3. Bring the appropriate identification documents.
  4. Report to visitor center to get your gate pass (or after hours to main gate).
Site Access for Minors

Persons under age 18 may enter the Argonne site and have access to the APS experiment hall with prior approval. Contact for futher information.

Site Access for Tours

The APS welcomes tour groups! Site access for tours is organized by Argonne's public affairs office.


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