Fiber Optic Quench Detection Via Optimized Rayleigh Scattering in High-field YBCO Accelerator Magnets

YBCO coated conductors are one of the primary options for generating the high magnetic fields needed for future high energy physics devices. Due to slow quench propagation, quench detection remains one of the primary limitations to YBCO magnets. Fiber optic sensing, based upon Rayleigh scattering, has the potential for spatial resolution approaching the wavelength of light, or very fast temporal resolution at low spatial resolution, and a continuum of combinations in between. This work will optimize Rayleigh scattering such that it provides the appropriate combination of spatial and temporal resolution for quench detection in YBCO magnets. The research institution has recently developed an experimentally validated 3D quench propagation code that will accurately define the acceptable range of spatial and temporal resolutions for effective quench detection in YBCO magnets. This code will evaluate present-day and potentially improved YBCO conductors. The data volume and speed requirements for quench detection via Rayleigh scattering require the development of a high performance trigger/data acquisition system, including algorithm and platform performance benchmarking. The safe operating range of spatial and temporal resolutions will be defined for present-day YBCO conductors. Begin development of a high performance trigger and data acquisition system that will be required for real-time quench detection via Raleigh scattering. Commercial Applications and Other Benefits: The behaviors quantified during this work will have great benefit in high energy physics applications. The expertise gained from this project will enable the development of very highfield solenoids, dipoles, and quadrupoles using YBCO conductor at low temperature for applications in future particle accelerators