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Title: Proof-of-principle demonstration of Nb3Sn superconducting radiofrequency cavities for high Q0 applications

Many future particle accelerators require hundreds of superconducting radiofrequency (SRF) cavities operating with high duty factor. The large dynamic heat load of the cavities causes the cryogenic plant to make up a significant part of the overall cost of the facility. Our contribution can be reduced by replacing standard niobium cavities with ones coated with a low-dissipation superconductor such as Nb3Sn. Here, we present results for single cell cavities coated with Nb3Sn at Cornell. Five coatings were carried out, showing that at 4.2 K, high Q0 out to medium fields was reproducible, resulting in an average quench field of 14 MV/m and an average 4.2 K Q0 at quench of 8 x 109 . In each case, the peak surface magnetic field at quench was well above Hc1, showing that it is not a limiting field in these cavities. Furthermore, the coating with the best performance had a quench field of 17 MV/m, exceeding gradient requirements for state-of-the-art high duty factor SRF accelerators. It is also shown that—taking into account the thermodynamic efficiency of the cryogenic plant—the 4.2 K Q0 values obtained meet the AC power consumption requirements of state-of-the-art high duty factor accelerators, making this a proof-of-principle demonstration formore » Nb3Sn cavities in future applications.« less
Authors:
 [1] ; ORCiD logo [1] ;  [1]
  1. Cornell Univ., Ithaca, NY (United States). Lab for Accelerator-Based Sciences and Education
Publication Date:
Report Number(s):
FERMILAB-PUB-15-680-TD
Journal ID: ISSN 0003-6951; 1624637
Grant/Contract Number:
AC02-07CH11359; ER41628; PHY-0841213; PHY-1416318
Type:
Published Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 8; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1184029
Alternate Identifier(s):
OSTI ID: 1394822