Beam-Beam Flags

if(associated(t%bb).and.dobb.andand.do_beam_beam) then Input settings

1. dobb = true $\Longrightarrow$ Parameter set to true. A user who never uses beam-beam may want to set this to false. A good compiler will perhaps ignore all statements containing dobb.
2. do_beam_beam = false $\Longrightarrow$ Beam is by default turned off by this global variable.
3. t%bb%patch = false $\Longrightarrow$ If the user places the beam-beam kick as some arbitrary location close to the entrance of a node, then a patch must be used. However the flag patch of this kick must be true. ``t'' is the integration node on which thebeam-beam kick sits.