deletions | additions       diff --git a/sectionFACILITY_OPER.tex b/sectionFACILITY_OPER.tex  index 94cb581..b2d0d9b 100644  --- a/sectionFACILITY_OPER.tex  +++ b/sectionFACILITY_OPER.tex 
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\subsection{BESSY II}   The annual beamtime calendar at BESSY II~\cite{Bakker_1999} is organized in weeks of user  operation, machine development and beamline commissioning, and shutdown. A standard week of scheduled user beam time at BESSY II~\cite{Bakker_1999}  starts Tuesday 7:00 a.m. and ends Sunday 23:00 providing the  three basic user operation modes. Every other Sunday two eight-hour shifts are given to the PTB (4$^{th}$ mode). \begin{description}  \item[Multi The three user modes are:  \begin{itemize}  \item {\em Multi  bunch hybrid mode] mode}  comprises 299$\,$mA total current, kept constant by top-up injections. General bunch pattern is an even filling of 300--350 bunches and a gap of about 100--50 bunches (550$\,$MHz, harmonic number 400).   In addition to this multi bunch current, up to five specific bunches are serving dedicated experiments.   The size of the gap is negotiated: the long gap (200$\,$ns) supports pulse picking with a mechanical chopper, the short gap (50$\,$ns) aims at overall stability. 
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decay phase and a closure of the beam shutters.  If the top-up lifetime constraint $>$5h cannot be met (e.g. due to vacuum problems)  BESSY can set a {\em lower nominal current} of $\approx 250\,$mA to stay operational.  \item[Single \item {\em Single  bunch mode] mode}  consists of 14$\,$mA in a (purity controlled) single bunch, refilled with top-up, used for time resolved experiments (2--3 weeks/y). This mode specifically depends on the LINAC.  The microtron can inject single bunches only with low efficiency, thus a lasting LINAC failure results in a decaying beam degraded mode.  \item[Low \item {\em Low  Alpha mode] mode}  even filling of 100$\,$mA (short pulse mode) or 15$\,$mA (THz mode, non- bursting coherent synchrotron radiation) in an alternating, 12 hour period decaying beam sequence (2--3 weeks/y). \item[National \item {\em National  Bureaux of Standards (PTB)] (PTB)}  main user mode, beam conditions according to their experimental requirements. \end{description} \end{itemize}  %{\em Top-up constraints} are imposed by the radiation protection prescriptions and are implemented in the top-up interlock at BESSY II, generating a number of enforced combinations of decay mode, closure of the beam shutters, and several refilling modes.  %{\em Decay only}: Enforced by insufficient lifetime ($t<$5$\,$h) or insufficient injection efficiency (four hour average of injection efficiency Eff$_{\mathrm{avg}}<$90\% enforce   %$T=4\,\mathrm{h}*(90\%-\mathrm{Eff}_{\mathrm{avg}})/(100\%-90\%)$ injection free time). W.r.t. accounting 
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\end{ruledtabular}  \end{table}