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Title: Reproducibility of High-Q SRF Cavities by High Temperature Heat Treatment

Recent work on high-temperature (> 600 °C) heat treatment of ingot Nb cavities in a customized vacuum furnace for several hours showed the possibility of achieving Q0-values of up to ~5×1010 at 2.0 K, 1.5 GHz and accelerating gradients of ~20 MV/m. This contribution presents results on further studies of the heat treatment process to produce cavities with high Q0 values for continuous-wave accelerator application. Single-cell cavities of different Nb purity have been processed through few cycles of heat-treatments and chemical etching. Measurements of Q0 as a function of temperature at low RF field and of Q0 as a function of the RF field at or below 2.0 K have been made after each treatment. Measurements by TOF-SIMS of the impurities depth profiles were made on samples heat treated with the cavities.
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  1. JLAB
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-ACC-14-1904; DOE/OR/23177-3119
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: IPAC' 14, June 15-20, 2014, Dresden, Germany
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States