RECENT RESULTS FROM Nb3Sn COATED SINGLE-CELL CAVITIES COMBINED WITH SAMPLE STUDIES AT JEFFERSON LAB

Conference · Sat Jun 01 00:00:00 EDT 2019

DOI:https://doi.org/10.18429/JACoW-IPAC2019-WEPRB110· OSTI ID:1975206

Eremeev, G. V. ^[1]; Pudasaini, U. ^[2]; Reece, C. E. ^[1]; Ciovati, G. ^[1]; Parajuli, I. ^[3]; Kelley, M. J. ^[4]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. College of William and Mary, Williamsburg, VA (United States)
3. Old Dominion Univ., Norfolk, VA (United States)
4. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)

The critical temperature (~ 18 K) and superheating field (~ 425 mT) of Nb3Sn are almost twice that of niobium, thereby promising the higher quality factor and accelerating gradient at any given temperature compared to traditional SRF cavities made of niobium. It can enable higher temperature for cavity operation (4 K Vs. 2 K), resulting in significant reduction in both capital and operating cost for the cryoplant. Several single-cell cavities along with witness samples were coated with Nb3Sn to explore, understand and improve the coating process for betterment of cavity performance. RF measurements of coated cavities combined with material characterization of witness samples were employed to update the coating process. Following some modifications to the existing coating process, we were able to produce Nb3Sn cavity with quality factor ? 2.1010 for accelerating gradient up to 15 MV/m at 4 K, without any significant Q-slope. In this article, we will discuss recent results from several Nb3Sn coated single-cell cavities combined with material studies of witness samples.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1975206
• Report Number(s): JLAB-ACC-19-2944; DOE/OR/23177-4685
• Country of Publication: United States
• Language: English