Processing strategies for niobium sheet used in advanced superconducting particle accelerator cavities
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Ultra-high-purity niobium sheet is used to fabricate radio frequency cavities for use in future linear accelerators. The complexity of the shapes requires the electron-beam welding of deep-drawn components, but difficulties with inconsistent formability, springback, and surface roughness have been traced to non-uniform microstructures and texture gradients that are common commercial niobium sheet. Two approaches under study to overcome these problems are the development of fine-grained favorably textured polycrystalline sheet, and the use of a properly of oriented and nearly, single-crystals sheet to form pieces of the cavity. Both approaches show promise but need further work.
author list (cited authors)
Baars, D., Bieler, T. R., Hartwig, K. T., Jiang, H., Compton, C., & Grimm, T. L.