Oct 8 – 10, 2018
INFN - Laboratori Nazionali di Legnaro
Europe/Rome timezone

Surface Characterization of NbTiN multilayer films for accelerator applications

Oct 9, 2018, 9:50 AM
Villi Room (INFN - Laboratori Nazionali di Legnaro)

Villi Room

INFN - Laboratori Nazionali di Legnaro

Viale dell'Università 2, Legnaro (Padova) - Italy
Other superconducting materials beyond niobium Other SC Materials beyond Niobium


Mr David Beverstock (Jefferson Lab)


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)


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)

Presentation materials