Insight to the Duration of 120 °C Baking on the Performance of SRF Niobium Cavities

Khanal, Bashu Dev; Dhakal, Pashupati

doi:10.1109/tasc.2023.3235311

Title: Insight to the Duration of 120 °C Baking on the Performance of SRF Niobium Cavities

Journal Article · Mon Jan 09 00:00:00 EST 2023 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2023.3235311· OSTI ID:1924790

Khanal, Bashu Dev ^[1];

^[2]

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

Low-temperature baking at 100 °C - 140 °C in ultra-high vacuum for several hours is the final cavity processing technique to achieve the highest accelerating gradient cavity by eliminating the high field Q-slope, typically on cavities made of high purity fine grain niobium and subjected to electropolishing. The temperature and duration of baking control the onset of the high field Q-slope and overall quality factor over the baseline measurements. The increase in quality factor is generally related to the reduction in the temperature-dependent surface resistance, which refers to BCS surface resistance due to the reduction in the electronic mean free path and elimination of high field Q-slope is still being actively investigated. Here, we present the results of a series of measurements on 1.3 GHz TESLA shape single-cell cavities with successive low-temperature baking at 120 °C up to 96 hours. The rf loss related to the trapping of residual magnetic field refer to flux trapping sensitivity was measured with respect to the duration of 120 °C bake.

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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); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC05-06OR23177; SC0009960

OSTI ID:: 1924790

Report Number(s):: JLAB-ACC-22-3721; DOE/OR/23177-5615; TRN: US2312535

Journal Information:: IEEE Transactions on Applied Superconductivity, Vol. 33, Issue 3; ISSN 1051-8223

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
temperature measurement
radio frequency
sensitivity
magnetic field measurement
surface resistance
electrical resistance measurement
surface treatment
flux trapping sensitivity
low-temperature baking
superconducting radio frequency (SRF) cavity

Title: Insight to the Duration of 120 °C Baking on the Performance of SRF Niobium Cavities

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