Date of Award

Spring 5-2022

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics

Committee Director

Gianluigi Ciovati

Committee Member

Jean Delayen

Committee Member

Yuan Zhang

Abstract

The development of metallic coatings with high purity and high thermal conductivity at cryogenic temperature could be very important for application to the superconducting radiofrequency (SRF) cavity technology. The deposition of such bulk coatings on the outer surface of a niobium cavity could result in higher heat conductance and mechanical stiffness, both of which are crucial for enhancing the cavity performance at a reduced cost.

Cold spray technology was used to deposit bulk coatings of pure copper and copper-tungsten alloys on the niobium substrate and the samples of size 2 mm × 2 mm cross section were cut and subjected to annealing at various temperatures ranging from 300 ◦C to 1000 ◦C. Thermal conductivity and residual resistivity ratio (RRR) were measured for various samples. A maximum RRR value of ∼130 and ∼40 was measured for pure Cu samples and CuW samples, respectively. Scanning electron microscopy was used to analyze the grain growth, grain distribution and presence of contaminant particulates.

DOI

10.25777/c7nq-rq26

ORCID

0000-0002-4091-6393

Included in

Physics Commons

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