Speaker
Description
Determining whether an RF cavity with an undetected gradient or phase transient is the culprit behind a beam loss event has been found to be a valuable tool for CEBAF operations. Analysis of beam position with the existing switched electrode electronics BPM hardware at the dispersive area and energy variation before a beam loss event was suggested as a method to determine if the beam loss event was correlated with an energy transient. With this purpose in mind, a prototype off-line system was developed in the fall of 2022. It implemented using National Instruments hardware and LabVIEW software and relied on a software trigger and was not integrated into the EPICS control system. Beam trips with energy transients are compared to the reason for the trips found in the CEBAF down time monitoring system. The initial results indicated that 20% of the faults had energy transients that were not coincident with any cavity faults. As a result cavity interlocks were adjusted so that the cavities tripped on such events. As a solution an existing data acquisition system that was developed for monitoring legacy RF systems in CEBAF system was deployed. It was used to capture BPM wire signals at a sample rate of 20 ksps; was triggered by a fiber signal that is part of the fast shutdown system; and was integrated into the EPICS control system. In addition to being able to analyze the energy transients live in the control room as well as after the fact, these systems allowed us to understand the energy jitter properties just prior to the fault. This paper will present recent results and describe a path forward using commercial off the shelf hardware installed in multiple locations which can be easily be integrated into EPICS.
| Abstract Category | Other |
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