deletions | additions       diff --git a/sectionPROPOSED_PRIM.tex b/sectionPROPOSED_PRIM.tex  index b7b379c..30e8a1a 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 means a current lower than 98$\,$mA.  {\em BESSY2:} 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 when the beam current is below $I(low)$ $I_{\hbox{low}}$  or the moment, the BESSY topup interlock enforces a closure of the beam 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 $I(max)$ $I_{\hbox{max}}$  is reached again. Short interruptions of the injector system in the order of a few minutes are neglected, as long as the beam current is not decaying to less than $I(tol)=91\%$ $I_{\hbox{tol}}=91\%$  of $I(max)$. $I_{\hbox{max}}$.  Below that threshold we record a 'beamdrop' event.  The limits are for the multi-bunch mode:  $ I(max)= I_{\hbox{max}}=  299\,$mA, $ I(low)= I_{\hbox{low}}=  200\,$mA and $ I(tol)= I_{\hbox{tol}}=  272\,$mA and for single-bunch mode: $ I(max)= I_{\hbox{max}}=  13.5\,$mA, $ I(low)= I_{\hbox{low}}=  8\,$mA and $ I(tol)= I_{\hbox{tol}}=  12\,$mA. {\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. 
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\subsection{Primary failure mode limit comparison}  Table~\ref{tab:pf_limits} shows the current limits for the primary  failure modes in comparison. The column I(max) $I_{\hbox{max}}$  shows the maximum current in the given mode. The current I(inj) $I_{\hbox{inj}}$  is the typical value when injection would start in this mode, below I(tol) $I_{\hbox{tol}}$  it would be considered a 'low-beam-current' event. The column I(low) $I_{\hbox{low}}$  shows the condition under which a 'no-beam' event would start. Most facilities do not just have a current limit, but a combination of either  the current being below a limit or the photon shutters being closed.  \begin{table} 
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\scriptsize  \begin{ruledtabular}  \begin{tabular}{lcrrrl}  \textbf{Facility}&\textbf{Mode}&\textbf{I(max)}&\textbf{I(inj)}&\textbf{I(tol)}&\textbf{I(low)}\\ \textbf{Facility}&\textbf{Mode}&\textbf{$I_{\hbox{max}}$}&\textbf{$I_{\hbox{inj}}$}&\textbf{$I_{\hbox{tol}}$}&\textbf{$I_{\hbox{low}}$}\\  & & (mA) & (mA) & (mA) & \\\hline  ALBA & decay & 120.0 & 72.0 & 72.0 & photon shutter (PhS)\\  ALBA & top-up & 100.0 & 98.5 & 98.0 & PhS \\