Speaker
Description
We present a method for detecting and characterizing anomalies in a nominally decoupled, recirculating linac accelerator, such as the Continuous Electron Beam Accelerator Facility (CEBAF). Proposed future accelerators of this type include PERLE and LHeC. The method computes the zero-lag cross-plane covariance from samples of beam position data, and analyzes its singular value decomposition (SVD). Each singular triplet of the SVD spectrum produces paired spatial patterns and a strength that quantify where and how the two planes move together at the same instant. Projecting each array of positions at a given time onto the spatial singular vectors indicates when the coupled pattern is active. Large modes provide direct evidence of dispersion, skew optics, position feedback cross-feed, scraping, or faults that introduce coupled beam motion. The construction is formalized, differentiability is discussed, and data from observed anomalies such as magnet failures and known optic modulation are presented.
Funding Agency
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
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