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Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c

Romanenko, A. ; Grassellino, A. ; Melnychuk, O. ; Sergatskov, D. A.

Journal of applied physics, 2014-05, Vol.115 (18) [Periódico revisado por pares]

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Título:
Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T c
Autor: Romanenko, A. ; Grassellino, A. ; Melnychuk, O. ; Sergatskov, D. A.
Assuntos: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ; PARTICLE ACCELERATORS
É parte de: Journal of applied physics, 2014-05, Vol.115 (18)
Notas: AC02-07CH11359
USDOE Office of Science (SC), High Energy Physics (HEP)
arXiv:1401.7747; FERMILAB-PUB-14-601-TD
Descrição: We report a strong effect of the cooling dynamics through Tc on the amount of trapped external magnetic flux in superconducting niobium cavities. The effect is similar for fine grain and single crystal niobium and all surface treatments including electropolishing with and without 120 °C baking and nitrogen doping. Direct magnetic field measurements on the cavity walls show that the effect stems from changes in the flux trapping efficiency: slow cooling leads to almost complete flux trapping and higher residual resistance, while fast cooling leads to the much more efficient flux expulsion and lower residual resistance.
Editor: United States: American Institute of Physics (AIP)
Idioma: Inglês

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