Surface Resistance Characterization of Nb3Sn using the HZB Quadrupole Resonator

Abstract

Nb3Sn is a very promising candidate material for future SRF cavities. With a critical temperature more than twice as the one of bulk niobium, higher operational temperatures with still lower surface resistance are theoretically possible. The RF properties of a sample prepared by Cornell University were characterized using the HZB Quadrupole Resonator. In comparison to a coated cavity this device enables SRF measurements over an extended parameter space frequency, temperature and RF field and easy access to physical quantities such as critical field and penetration depth. In this contribution we present surface resistance and RF critical field measurements