deletions | additions       diff --git a/sectionPROPOSED_SECO.tex b/sectionPROPOSED_SECO.tex  index a1aee0a..c19ab4a 100644  --- a/sectionPROPOSED_SECO.tex  +++ b/sectionPROPOSED_SECO.tex 
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We record a 'low-lifetime' event when the beam lifetime stays below 4.5 hours for longer than 5 minutes.   The event stops as soon as the lifetime is above 4.5 hours again for longer that  1 minute.   The limits are $\tau(normal)=8\,h$ and $\tau(low)=4.5\,h$.  Table~\ref{table:lifetime_limits} shows a comparison of the Low-lifetime limits.  \begin{table}  \centering 
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{\em ALBA:} is continuously monitoring the electron transverse beam size with a pinhole that uses the X-rays part of the synchrotron radiation produced in a bending magnet.   The image is visually controlled in real time at the control room and automatically recorded on the ALBA database. Nominal beam sizes at the monitor are $ 60\,\mu 60$\,\mu  m$ in horizontal and $ 30\,\mu 30$\,\mu  m$ in vertical. Any deviation from the usual beam size by more than 20\% in any transversal plane is registered as a beam incidence and the beamlines are informed about it.  
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{\em SLS:} runs at a low betatron coupling of about 0.1\% for user experiments.   This results in an beam height of 10 $\mu 10$\,\mu  m$ (1 sigma) and a width of 55 $\mu 55$\,\mu  m$ (1 sigma) at the source points of the dipole beamlines. Many kind of failures can create betatron coupling in the machine and therefore increase the vertical beam size.   In addition some problems, like beam instabilities, can blow up the beam horizontally as well.   We measure the beam size at a dipole beamline with a dedicated monitor (ref).   beam-blow-up events are recorded when the sigma is vertically above 15 $\mu 15$\,\mu  m$ or horizontally above 100 $\mu 100$\,\mu  m$ for more than one minute. The events stop if the size is below the given limits.  The limits are:  $\sigma(\mbox{y-normal})= 10\,\mu m$,  $\sigma(\mbox{y-high}) \ge 15\,\mu m$,  $\sigma(\mbox{x-normal})= 55\,\mu m$, and  $\sigma(\mbox{x-high}) \ge 100\,\mu m$  Most of the measured 'beam-blow-up' events so far had been induced by a deterioration of the monitor after more than a year of operation.   We will now replace the optical components which are causing the deterioration on a yearly basis. 
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Table~\ref{table:blow-up_limits} shows a comparison of the Beam-blow-up limits.  \begin{table}  \centering  \caption{Beam-blow-up limits  \label{table:blow-up_limits}}%\scriptsize limits\label{table:blow-up_limits}}  \begin{ruledtabular}  \begin{tabular}{lrp{4.5cm}}\hline  \textbf{Facility}&\textbf{size increase}&\textbf{Remark}\\\hline