deletions | additions       diff --git a/subsectionLowbeamlif.tex b/subsectionLowbeamlif.tex  index dab1fa8..4211939 100644  --- a/subsectionLowbeamlif.tex  +++ b/subsectionLowbeamlif.tex 
...
\subsection{Low-beam-lifetime}   Facilities operating  in top-up can mode  keep the beam current constant even with a low beam lifetime. But this will This can  cause an increased frequency of injections and therefore more distortions and background radiation for the experiments. The limit for this failure a low beam lifetime  mode does depend depends  on the facility and the specific operation mode. We propose to define a minimal lifetime $\tau_{\hbox{low}}$ for each user operation mode of at  a facility and record whenever the lifetime is below that limit for more than a minute.  {\em ALBA} has a nominal beam lifetime that is given by the combination ofboth the  filling pattern and the pattern,  radio frequency (RF) voltage. voltage and transverse coupling constant.  The typical lifetime at 100$\,$mA is 22 hours.   ALBA operates with six RF cavities each fed with by  two Inductive Output Tubes (IOTs), and a typical ``low-beam-lifetime'' failure is caused by the trip of one IOT.   Since it is the trip of a sub-system, the operator will record it.  Normally the operator will recover the IOT and thus recover the nominal beam lifetime. 
...
Top-up is stopped if the lifetime drops below 10 hours.  {\em SLS} has a typical beam lifetime of about 8 hours.   Depending on the vacuum conditions  and the selected coupling this lifetime may varies in practice between 6 and 10 hours during normal operation.   A low beam lifetime leads to more frequent injections from the for  top-up. A ``low-beam-lifetime'' failure is automatically recorded when the beam lifetime stays below 4.5 hours for longer than five minutes.   The failure mode stops as soon as the lifetime is above 4.5 hoursagain  for longer than one minute. The failure mode ``low-beam-lifetime'' is not independently recorded at   neither BESSY II, Elettra, LNLS-UVX, PETRA III nor or  SPring-8 . facilities.  Table~\ref{tab:lifetime-limits} shows a comparison of what would be considered a ``low-beam-lifetime'' at the different facilities.