Operational Restrictions

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Each hall has certain administrative operating restrictions that limit specific operating parameters. These restrictions are spelled out in a web-accessible document know as the Operational Restrictions ( http://opweb.acc.jlab.org/internal/ops/ops_webpage/op_limits/oplimits.html). These restrictions include, but are not limited to the following:

  • Energy restrictions
  • Current limits
  • Power limitations for dumps
  • Beam raster information for targets and dumps

Any time a hall requests a setting change for one of the above parameters (not a change to the actual limit, just a setting adjustment), the Crew Chief is responsible for making sure that the request falls within the limits of the Operational Restrictions. A list at the top of the Operational Restrictions document shows who has the authority to make a change to any of the limits. Some require run coordinator approval, others hall coordinator approval, and still others can only be changed by the Accelerator Division (i.e., dump power limits).