There are a lot of storage ring light sources operational, and
users, funding agencies and others compare these light sources.
If different light sources are compared, one important
parameter is the beam availability. A meaningfull comparison of
availabilities is only possible if the numbers are calculated
the same way.
At ARW 2013 in Melbourne a group of operations managers began to
develop ideas for a common operation metrics for storage ring light
sources. The feedback from 7 different labs went into a common
definition of the main operational parameters of light sources.
2016 a paper was published in PhysRev, introducing this common
This talk will give an update on this initiative.