Abstract
Modern 3rd generation synchrotron light sources aim for 100% availability. No single beam interruption is acceptable and every beam disturbance should be investigated: what caused the interruption? Can it be avoided in the future? If it cannot be avoided, how can the recovery be accelerated? An automated event recording system has been implemented at the Swiss Light Source (SLS) in order to simplify beam distortion investigations with respect to a well-defined metrics. The system identifies beam disturbances and records automatically the type and duration of the event. Relevant information of the event, like control system archive data or shift summaries, is linked to the event and presented in Web pages. Tools for the automated evaluation of alarm logs are provided that generate summaries of a beam distortion. On the basis of this information each event will be assigned to a failure cause. The means to filter the events are provided. We will describe the concept and the implementation of the system at the SLS and our experiences with it. Finally, the SLS operation event logging system will be compared with failure analysis at other light sources.
Highlights
No single beam interruption is acceptable and every beam disturbance should be investigated: what caused the interruption? Can it be avoided in the future? If it cannot be avoided, how can the recovery be accelerated? An automated event recording system has been implemented at the Swiss Light Source (SLS) in order to simplify beam distortion investigations with respect to a well-defined metrics
This hierarchy is visible to the operator when he acknowledges the alarm in the interactive user interface, but it is not visible in the flat alarm log
Several facilities do keep a manual database of beam outages and distortions
Summary
A large fraction of the work of an operations manager is dedicated to the analysis of operations data. A light source wants to know all about loss of the stored beam and about problems with a short beam lifetime. We define the two event types: a ‘‘downtime’’ event starts, when the beam current is below 50 mA and stops when 400 mA is stored. A beam loss is handled by the operator in the control room He normally does not need to fully understand what caused the beam loss, he just refills the storage ring. A beam loss where an alarm shows that a magnet power supply in the storage ring failed will be assigned to the system ‘‘magnet power supplies.’’ The magnet power supply group will use the collected data to find out which power supplies caused beam losses in the past, how often, and how long. The operations manager will use the data to keep himself up to date with the machine operation, to find out when problems reoccur, for the planning of resources, for upgrade plans, and so on
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