AVS 58th Annual International Symposium and Exhibition
    Vacuum Technology Division Tuesday Sessions
       Session VT-TuP

Paper VT-TuP9
Development of Niobium Thin Films Tailored for SRF Applications

Tuesday, November 1, 2011, 6:00 pm, Room East Exhibit Hall

Session: Vacuum Technology Poster Session & Student Poster Competition
Presenter: Joshua Spradlin, Jefferson Lab
Authors: J.S. Spradlin, Jefferson Lab
A.-M. Valente-Feliciano, Jefferson Lab
Correspondent: Click to Email
Over the years, Nb/Cu technology, despite its shortcomings due to the commonly used magnetron sputtering, has positioned itself as an alternative route for the future of superconducting structures used in accelerators. Recently, significant progress has been made in the development of energetic vacuum deposition techniques, showing promise for the production of thin films tailored for SRF applications. JLab is pursuing energetic condensation deposition via techniques such as Electron Cyclotron Resonance and High Power Impulse Magnetron Sputtering (HiPIMS). As part of this project, the influence of the deposition energy on the material and RF properties of the Nb thin film is investigated with the characterization of their surface, structure, superconducting properties and RF response. It has been shown that the film RRR can be tuned from single digits to values greater than 400. This paper presents results on surface impedance measurements correlated with surface and material characterization for Nb films produced on various substrates, monocrystalline and polycrystalline as well as amorphous.