The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

Lesson Module A-15: Global Online - pg 2

Why might a beamline be taken Globally Offline?
  • PSS validation or repair.
  • Concern that beam may be lost due to faulty Front End equipment generating a fault at a particular beamline.
  • At the end of the user run, the Floor Coordinators take all beamlines Globally Offline.
Who may take a beamline Global Offline and return a beamline to Global Online?
  • Per procedure, both Floor Coordinators and Main Control Room operators may take a beamline Global Offline.
  • However, only Floor Coordinators may return a beamline to Global Online status.
  • Systems Interlock personnel may sign out and use global online/offline keys to perform ACIS trip tests and/or end-to-end tests for their systems' validations.
Take this time to read through the Procedure for the Use of Beamline Global Online Keys.