Fabrication and radio frequency test of large-area MgB2 films on niobium substrates

Magnesium diboride (MgB2) is a promising candidate material for superconducting radio frequency (RF) cavities because of its higher transition temperature and critical field compared with niobium. To meet the demand of RF test devices, the fabrication of large-area MgB2 films on metal substrates is...

Full description

Saved in:
Bibliographic Details
Published in:Superconductor science & technology 2017-02, Vol.30 (4)
Main Authors: Ni, Zhimao, Guo, Xin, Welander, Paul B, Yang, Can, Franzi, Matthew, Tantawi, Sami, Feng, Qingrong, Liu, Kexin
Format: Article
Language:English
Subjects:
cryogenic RF test
flim
HPCVD
large-area MgB
large-area MgB2 flim
MATERIALS SCIENCE
Nb substrate
surface resistance
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Magnesium diboride (MgB2) is a promising candidate material for superconducting radio frequency (RF) cavities because of its higher transition temperature and critical field compared with niobium. To meet the demand of RF test devices, the fabrication of large-area MgB2 films on metal substrates is needed. In this work, high quality MgB2 films with 50 mm diameter were fabricated on niobium by using an improved HPCVD system at Peking University, and RF tests were carried out at SLAC National Accelerator Laboratory. The transition temperature is approximately 39.6 K and the RF surface resistance is about 120 at 4 K and 11.4 GHz. The fabrication processes, surface morphology, DC superconducting properties and RF tests of these large-area MgB2 films are presented.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/aa5aa0