A Common Operation Metrics for Third Generation Light Sources

High reliability is a very important goal for 3 rd generation light sources. Very often the beam availability is used as the operation metrics to measure the reliability of the accelerator. A surveyof several light sourcesrevealedthat the calculation of this statistics varies significantly between the facilities. This prevents a useful comparison of their reliabilities. The authors propose a specific metrics for the reliability of 3 rd generation light sources; a metrics that will allow a detailed and meaningful comparison of these particle accelerators.