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Title: Hybrid Physical Chemical Vapor Deposition of Magnesium Diboride Inside 3.9 GHz Mock Cavities

Magnesium diboride (MgB 2) is considered a candidate for the next generation superconducting radio frequency (SRF) cavities due to its higher critical temperature T c (40 K) and increased superheating field (H sh) compared to other conventional superconductors. These properties can lead to reduced BCS surface resistance (R BCS S) and residual resistance (R res), according to theoretical studies, and enhanced accelerating field (E acc) values. Here, we investigated the possibility of coating the inner surface of a 3.9 GHz SRF cavity with MgB 2 by using a hybrid physical-vapor deposition (HPCVD) system designed for this purpose. To simulate the actual 3.9 GHz SRF cavity, we also employed a stainless steel mock cavity for the study. The film qualities were characterized on small substrates that were placed at the selected positions within the cavity. MgB 2 films on stainless steel foils, niobium pieces, and SiC substrates showed transition temperatures in the range of 30-38 K with a c-axis-oriented crystallinity observed for films grown on SiC substrates. Dielectric resonator measurements at 18 GHz resulted in a quality factor of over 30 000 for the MgB 2 film grown on a SiC substrate. Furthermore, by employing the HPCVD technique, a uniform filmmore » was achieved across the cavity interior, demonstrating the feasibility of HPCVD for MgB 2 coatings for SRF cavities.« less
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Temple Univ., Philadelphia, PA (United States). Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; SC0011616; N0014-12-1-0777
Accepted Manuscript
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 27; Journal Issue: 4; Journal ID: ISSN 1051-8223
Institute of Electrical and Electronics Engineers (IEEE)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC); US Department of the Navy, Office of Naval Research (ONR)
Country of Publication:
United States
36 MATERIALS SCIENCE; linear particle accelerator; superconducting films; magnesium compounds; boron alloys
OSTI Identifier: