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\subsection{SLS Operation Modes}  The SLS Swiss Light Source (SLS)~\cite{Aiba_2013}  runs basically only in one operation mode: 80\% filling (390 out of 480 buckets), 400$\,$mA top-up. We can add on demand a single bunch in the gap with a higher charge - that is the so called "camshaft mode".   Typically the single bunch is filled to 4 times the charge of the other buckets.   Switching between the modes does not effect users of the 80\% filling, since the beam current is kept constant at 400$\,$mA in both.