deletions | additions       diff --git a/sectionPROPOSED_PRIM.tex b/sectionPROPOSED_PRIM.tex  index 8ecf039..21c6101 100644  --- a/sectionPROPOSED_PRIM.tex  +++ b/sectionPROPOSED_PRIM.tex 
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In top-up mode, with 100$\,$mA in the machine and injections every 20 minutes, a low beam current starts when the current lower than 95$\,$mA. This current will require the closure of the FEs for re-injection up to 100 mA.  {\em BESSY II:} users do not make a big difference between lost beam and closed beamshutters: they do not get, what has been promised, photons on sample.   Thus, a 'no-beam' event ("dark" time) starts either  when the beam current is below $I_{\hbox{low}}$ $I_{\hbox{low}}$,  or the moment, the BESSY topup interlock enforces a closure of the beam shutters shutters,  before the next injection shot is permitted. Whatever happens first will trigger the start of the event; it'll stop, when the nominal beam current $I_{\hbox{max}}$ is reached again.  Short interruptions of the injector systemin the order of a few minutes  are neglected, as long as the beam current is not decaying to less than $I_{\hbox{tol}}=91\%$ of $I_{\hbox{max}}$. Below that threshold we record a 'beamdrop' event.  The limits are Numbers  for the limits are in  multi-bunch mode: $ I_{\hbox{max}}= 299\,$mA, $ I_{\hbox{low}}= 200\,$mA and $ I_{\hbox{tol}}= 272\,$mA and for in  single-bunch mode: $ I_{\hbox{max}}= 13.5\,$mA, $ I_{\hbox{low}}= 8\,$mA and $ I_{\hbox{tol}}= 12\,$mA.  If BESSY II operates in decaying beam mode (low alpha, degraded SB) no low-beam-current is defined. Independent from the re-fill schedule insufficient beam current is accounted as no-  beam by $I_{\hbox{min}}$. In low α mode $I_{\hbox{min}}$ =5mA, in degraded single bunch mode $I_{\hbox{min}}$ =3mA  {\em Elettra:} uses the term 'fatal failure' for 'no-beam' events.   It starts when the beam current is zero and stops when the control over the gaps is given back to the users.  The nominal beam current is kept constant by top-up with a delta current of 1$\,$mA.