Speaker
Description
Nb3Sn thin film cavities are new generation of superconducting cavities, which have the potential to replace traditional pure niobium cavities owing to their superior theoretical radio frequency (RF) performance. Higher theoretical acceleration gradient and quality factor give Nb3Sn cavities more possibilities in the future. There have been relatively high success in producing such cavities by Sn diffusion method. The production of such cavities through thin film deposition on copper cavity foresees lower cost of material and at the same time profiting from higher thermal conductance of copper.
At Daresbury Laboratory, we have commissioned a new Nb3Sn deposition facility for depositing a Nb cavity with Nb3Sn. The system is based on using planar magnetron where the optimised parameters for Nb3Sn on flat surfaces had been well stablished. The Cavity was deposited at 580 °C using two special designed 2 inch magnetrons travelling inside cavity simultaneously from each end of the cavity. The deposition was done at 50 W DC power with a bias of -75 V. We further report on the RF performance of the cavity at 4 K in liquid He, demonstrating quality factor Q0 of 3x1010 comparable to Nb cavity at 2 K and extending to accelerating gradient of up to 16 MV/m.
Funding Agency
STFC
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