Analysis of RF losses and material characterization of samples removed from a Nb3Sn-coated superconducting RF cavity

Pudasaini, Uttar; Eremeev, Grigory; Reece, Charles E.; Tuggle, James; Kelley, Michael J.

doi:10.1088/1361-6668/ab75a8

Title: Analysis of RF losses and material characterization of samples removed from a Nb₃Sn-coated superconducting RF cavity

Journal Article · Fri Feb 28 00:00:00 EST 2020 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6668/ab75a8· OSTI ID:1602434

^[1]; Eremeev, Grigory ^[2]; Reece, Charles E. ^[2]; Tuggle, James ^[3]; Kelley, Michael J. ^[4]

College of William and Mary, Williamsburg, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Nb₃Sn (T_c≈18 K and H_sh≈400 mT) is a prospective material to replace Nb (T_c≈9 K and H_sh≈200 mT) in SRF accelerator cavities for significant cost reduction and performance enhancement. Because of its material properties, Nb3Sn is best employed as a thin film (coating) inside an already built RF cavity structure. A particular test cavity noted as C3C4 was a 1.5 GHz single-cell Nb cavity, coated with Nb3Sn using Sn vapor diffusion process at Jefferson Lab. Cold measurements of the coated cavity indicated the superconducting transition temperature of about 18 K. Subsequent RF measurements indicated field-dependent surface resistance both at 4.3 K and 2.0 K. After initial cold measurements, the cavity RF loss distribution was studied with a thermometry mapping system. Loss regions were identified with thermometry and were cut out for material analysis. The presence of significantly thin patchy regions and other carbon-rich defects is associated with strong local field-dependent surface resistance. This paper summarizes RF and thermometry results correlated with material science findings.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0014475; AC05-06OR23177

OSTI ID:: 1602434

Report Number(s):: JLAB-ACC-19-3058; DOE-OR-23177-4795; TRN: US2103999

Journal Information:: Superconductor Science and Technology, Vol. 33, Issue 4; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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