Document Type


Publication Date




Publication Title

Physical Review Accelerators and Beams






114601 (1-16)


We report on the development of machine learning models for classifying C100 superconducting radio-frequency (SRF) cavity faults in the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab. CEBAF is a continuous-wave recirculating linac utilizing 418 SRF cavities to accelerate electrons up to 12 GeV through five passes. Of these, 96 cavities (12 cryomodules) are designed with a digital low-level rf system configured such that a cavity fault triggers waveform recordings of 17 rf signals for each of the eight cavities in the cryomodule. Subject matter experts are able to analyze the collected time-series data and identify which of the eight cavities faulted first and classify the type of fault. This information is used to find trends and strategically deploy mitigations to problematic cryomodules. However, manually labeling the data is laborious and time consuming. By leveraging machine learning, near real-time—rather than postmortem—identification of the offending cavity and classification of the fault type has been implemented. We discuss performance of the machine learning models during a recent physics run. Results show the cavity identification and fault classification models have accuracies of 84.9% and 78.2%, respectively.


Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Original Publication Citation

Tennant, C., Carpenter, A., Powers, T., Shabalina Solopova, A., Vidyaratne, L., & Iftekharuddin, K. (2020). Superconducting radio-frequency cavity fault classification using machine learning at Jefferson Laboratory. Physical Review Accelerators and Beams, 23(11), 1-16, Article 114601.