deletions | additions       diff --git a/sectionPROPOSED_SCHE.tex b/sectionPROPOSED_SCHE.tex  index 4fa34bc..2f197f7 100644  --- a/sectionPROPOSED_SCHE.tex  +++ b/sectionPROPOSED_SCHE.tex 
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\section{PROPOSED SCHEDULE STATISTICS}   Some facilities are very flexible to compensate users for long beam outages.   Either some of the machine development shifts are sacrificed just after a long beam outage, or pre-scheduled blocks of shifts are used to re-schedule users, when problems with the accelerator prevented them to finish their experiments. These compensation times are currently accounted for in very different ways, depending on the facility.  We therefore propose a unified metrics for the accounting of the user operation times.   User operation should be distinguished in two categories:  \begin{itemize}  \item {\em Scheduled User Time:} time allocated for user experiments at least one month in advance.  \item {\em User Backup Time:} time that was originally not allocated for experiments, but was later provided to re-schedule users that could not finish their measurements. \end{itemize}  The sum of these is the {\em User Time}; operation failures should be recorded during all of this time.  If user time is re-scheduled to shutdown less than one month before the actual time, then this has to be recorded as a 'no-beam' event. ``no-beam'' failure.  This rule takes care that all beam outages are visible events in the statistics:   some facilities were not counting outages of several days for the beam availability,   because they re-scheduled all users to newly allocated time and declared the downtime to be a shutdown.  
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A vacuum leak occurs in the storage ring and causes a 7 day beam outage.   The management decides to declare these 7 days to be shutdown and to shorten the following shutdown in two weeks time by seven days to re-schedule all users.  According to our proposal this will be accounted for as a seven day or 168 hours ``No-beam'' ``no-beam''  event. The extra seven days are {\em User Backup Time}.   The total user time will be 4168 hours. This still allows each facility to calculate ``beam-availability'' according to their own definitions.  But at the same time it provides statistical data that can be compared to other facilities.