Commissioning results of Nb₃Sn cavity vapor diffusion deposition system at JLab

Conference · Tue Sep 01 04:00:00 EDT 2015

OSTI ID:1221900

Eremeev, Grigory ^[1]; Clemens, William A. ^[1]; Macha, Kurt M. ^[1]; Park, HyeKyoung ^[1]; Williams, R. ^[1]

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1. Jefferson Lab., Newport News, VA (United States)

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 E_acc ≅ 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 E_acc ≅ 8 MV/m at both temperatures. The highest field was limited by the available RF power.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1221900
• Report Number(s): JLAB-ACC--15-2048; DOE/OR/23177--3355
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
BINARY ALLOY SYSTEMS
CEBAF ACCELERATOR
COMMISSIONING
DIFFUSION
ELECTRIC POTENTIAL
GHZ RANGE 01-100
NIOBIUM BASE ALLOYS
PERFORMANCE
PHYSICAL VAPOR DEPOSITION
QUALITY FACTOR
SUPERCONDUCTING CAVITY RESONATORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TIN ALLOYS
TRANSITION TEMPERATURE