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Expulsion of ambient flux has been shown to be crucial to obtain high qualityfactors in bulk niobium SRF cavities. However, there remain many questions asto what properties of the niobium material determine its flux expulsionbehavior. In this paper, we present first results from a new study of twocavities that were specially fabricated to study flux expulsion. Both cavitieswere made from large grain ingot niobium slices, one of which had its slicesrolled prior to fabrication, and none these slices were annealed prior tomeasurement. Expulsion measurements indicate that a dense network of grainboundaries is not necessary for a cavity to have near-complete flux trappingbehavior up to large thermal gradients. The results also contribute to a bodyof evidence that cold work is a strong determinant of flux expulsion behaviorin SRF-grade niobium.

The Effect of Mechanical Cold Work on the Magnetic Flux Expulsion of Niobium