Fermilab, Batavia
Fermilab has developed a TIG welding procedure that will attach a 9-cell 1.3GHz niobium cavity to a titanium helium vessel. These welds were designed to meet ASME Boiler & Pressure Vessel Codes, Division 1 and are full penetration welds. The cavities produced will be used in Japan’s S-1 Global cryomodule, Fermilab’s Project X cryomodules, International Linear Collider and the current Type IV Cryomodules (T4CM). Discussed in further detail will include: Setting up electron beam weld parameters for Ti transition rings for the cavities. On-going work with U.S. vendors to produce reliable helium vessels that pass mechanical inspections, vacuum requirements and X-rays. Tooling requirements for the assembly and alignment of the cavity to the helium vessel. Settings that are applied to the Glovebox environment to produce the best quality TIG welds. What test measurements are taken throughout the process to monitor the cavity for excessive cell deformation due to the heat loads from the welding, and results from HTS on the fist dressed cavity.
