APPLICATION OF THE SPINNING TECHNIQUE TO THE PRODUCTION OF HIGH-BETA SEAMLESS SUPERCONDUCTING RESONATORS FOR PARTICLE ACCELERATORS

Superconducting resonators for high beta particle accelerators are mul ticell structures done in niobium or in niobium-sputtered copper. In b oth cases the resonator basis are traditionally fabricated by spinning or deep drawing half-cells and electron-beam welding them together at level of the equator; cells are than welded one to the other at level of the iris. Although after several years of research this manufactur e procedure has become well-established both for niobium and for coppe r cavities, full-penetrating electron-beam welds make levitating produ ction costs, and may easily jeopardize quality of results in both case s. We have developed an original technique for the preparation of seam less 1.5 GHz cavities by simply lathe-spinning a planar disk or a seam less, tube. Both niobium and copper can be easily manufactured with hi gh reproducibility and significant savings in manufacture costs.