Controlled Access is the state of the PSS when delivery of
beam and/or RF power is not permitted but the hall
is considered a controlled area. In this state, people are ``counted'' both
entering and leaving the
hall to ensure that no one is left inside when the Personnel Safety System
advances to the RF
Permit or Beam Permit states. Hall entry during the controlled access
state is permitted only to
people authorized or qualified by Jefferson Lab . Entry to and exit from the hall
is controlled from the
MCC. The Hall cannot be placed in the ``controlled access'' state without
having first been
swept.