SRF2025 - 22nd International Conference on RF Superconductivity

Production of Nb3Sn film on copper substrate by the bronze route and the RF characterization of samples with the quadrupole resonator

THA01

25 Sept 2025, 08:30

20m

Ito International Research Center

Board: THA01

Invited Oral Presentation MC2: Fundamental SRF research and development Thursday Oral Session: A

Speaker

Ming Lu (Helmholtz-Zentrum Berlin für Materialien und Energie, Institute of Modern Physics, Chinese Academy of Sciences)

Description

Copper-based Nb3Sn cavity is a promising candidate for next generation accelerator applications in the field of superconducting radio frequency (SRF). It combines the excellent thermal conductivity of copper and the superior superconducting properties of Nb3Sn, and has the potential to greatly improve the performance of the SRF cavity. The electrochemical and thermal synthesis (ETS) bronze route is one of the proven methods to achieve Nb3Sn coating on copper. Its advantages are low cost, simple operation, suitable for complex cavity types and mass production. In this report, we have prepared a copper-based Nb3Sn sample specifically for Quadrupole Resonator (QPR) testing. We provide a complete set of QPR sample preparation processes from copper electropolishing, Nb sputtering, electrodeposition and heat treatment to synthesize Nb3Sn. By optimizing the entire preparation process and key parameters, a new Cu-based Nb3Sn QPR sample was successfully prepared and its RF properties have been characterized by QPR testing system at HZB.