Abstract
Storage ring light sources aim for high operational reliability. Very often beam availability is used as an operation metric to measure the reliability. A survey of several light sources reveals that the calculation of availability varies significantly between facilities. This complicates useful comparisons of reliability. Furthermore the beam availability does not provide insight regarding reliability of beam characteristics such as orbit and beam size stability. The authors propose specific metrics to evaluate the reliability of storage ring light sources; these metrics allow a detailed and meaningful comparison across facilities. Such comparisons are useful to further optimize the reliability of storage ring light source facilities.
Highlights
Reliability is typically defined as the ability of a system to serve a given function over time
Common operation metrics data from other light sources could further help to assess the validity of a specific measure: it could demonstrate how similar measures at other facilities helped to improve specific failure modes; and the current failure rates can be directly compared to other facilities
State-of-the-art operation metrics must take these conditions into account: the performance requirements have to be strictly monitored and all events where the facility fails to meet requirements should be recorded, analyzed and published
Summary
Reliability is typically defined as the ability of a system to serve a given function over time. In this sense the reliability of a particle accelerator is very important for user facilities like storage ring light sources and provides an important design objective for new large scale accelerator facilities as for example the International Linear Collider [1]. Operation metrics should quantify the reliability of a particle accelerator. If the objective is to assess the improvement of a specific facility over time, the operation metric should be closely related to specific user requirements [2]. In order to compare reliability of different facilities, one needs a common standard for the calculation of operation metrics
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