Speaker
Mr
David Beverstock
(Jefferson Lab)
Description
Further enhancement of superconducting accelerating cavity performance calls upon the development of materials beyond bulk niobium (Nb). Superconducting RF (SRF) is a surface phenomenon; for most superconducting materials the RF penetration depth is in the range of hundreds of nanometers. Due to the field penetration enhancement occurring in films with a thickness smaller than their nominal penetration depth, multilayer superconductor/insulator/superconductor (SIS) structures are theorized to have potential to support surface magnetic fields beyond the reach of the current SRF cavities. A candidate superconductor for SIS structures is the ternary compound NbTiN. SIS structures based on NbTiN and AlN are currently under development at JLab. NbTiN can be deposited with nominal superconducting parameters using DC reactive magnetron sputtering. This contribution presents the characterization of surface, material and superconducting properties of NbTiN films and SIS structures.
Primary author
Mr
David Beverstock
(Jefferson Lab)
Co-authors
Dr
Anne-Marie Valente-Feliciano
(Jefferson Lab)
Dr
Charles Reece
(Jefferson Lab)
Dr
Douglas Beringer
(The College of William and Mary)
Dr
Michael Kelley
(The College of William and Mary)
