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Title: Commissioning results of Nb3Sn cavity vapor diffusion deposition system at JLab

Nb3Sn as a BCS superconductor with a superconducting critical temperature higher than that of niobium offers potential benefit for SRF cavities via a lower-than-niobium surface resistance at the same temperature and frequency. A Nb3Sn vapor diffusion deposition system designed for coating of 1.5 and 1.3 GHz single-cell cavities was built and commissioned at JLab. As the part of the commissioning, RF performance at 2.0 K of a single-cell 1.5 GHz CEBAF-shaped cavity was measured before and after coating in the system. Before Nb3Sn coating the cavity had a Q0 of about 1010 and was limited by the high field Q-slope at Eacc ≅ 27 MV/m. Coated cavity exhibited the superconducting transition at about 17.9 K. The low-field quality factor was about 5∙109 at 4.3 K and 7∙109 at 2.0 K decreasing with field to about 1∙109 at Eacc ≅ 8 MV/m at both temperatures. The highest field was limited by the available RF power.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Jefferson Lab., Newport News, VA (United States)
Publication Date:
OSTI Identifier:
1221900
Report Number(s):
JLAB-ACC--15-2048; DOE/OR/23177--3355
TRN: US1601455
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; CEBAF ACCELERATOR; NIOBIUM BASE ALLOYS; TIN ALLOYS; BINARY ALLOY SYSTEMS; SUPERCONDUCTING CAVITY RESONATORS; TRANSITION TEMPERATURE; GHZ RANGE 01-100; COMMISSIONING; PHYSICAL VAPOR DEPOSITION; DIFFUSION; QUALITY FACTOR; PERFORMANCE; ELECTRIC POTENTIAL; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE DEPENDENCE