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Niobium Cavity Material for 650 MHz LB 5-Cell Cavity Fabrication. GENERAL Fermi National Accelerator Laboratory (FNAL, Fermilab) designs and constructs superconducting particle accelerators. The speci... Niobium Cavity Material for 650 MHz LB 5-Cell Cavity Fabrication. GENERAL Fermi National Accelerator Laboratory (FNAL, Fermilab) designs and constructs superconducting particle accelerators. The specification attached to this Notice addresses Niobium-Titanium alloy for superconducting radio-frequency (SRF) cavities, which are a key component of particle accelerators. Components are fabricated from stock by machining or other metal-forming processes. Components are joined by electron-beam welding or TIG welding. Cavities are operated in a cryogenic vacuum environment, requiring pressure certifications and material traceability.