Residual loss due to magnetic flux trapping in niobium superconducting microwave cavities

Conference · Wed Mar 01 04:00:00 EST 2023

OSTI ID:2282045

Dhakal, P. ^[1]; Ciovati, Gianluigi ^[1]; Khanal, Bashu ^[2]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Old Dominion Univ., Norfolk, VA (United States)

One of the significant source of radio frequency loss in superconducting microwave cavities is the trapped residual magnetic field during the cooldown due to the incomplete Messier effect. The sensitivity of flux trapping depends on the distribution of impurities, network of dislocations and defects which pin vortices. Recent advancement in cavity processing techniques resulted in very high quality factors with impurity doping, however the rf loss related to the flux trapping increases. High quality factor in SRF cavities is not only limited to particle accelerators but also emerging as an application to quantum computing and quantum information science. In this presentation, we present the results of measurements of flux trapping sensitivity on several 1.3 GHz elliptical accelerating cavities with different grain size, impurity content and surface preparations.

• 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: 2282045
• Report Number(s): JLAB-ACC-23-3990; DOE/OR/23177-7372
• Country of Publication: United States
• Language: English