Fabrication and Radio Frequency Properties of 3-GHz SRF Cavities Coated with MgB2

Magnesium diboride (MgB2) is considered a potential material for superconducting radio frequency cavities. MgB2 coated Cu cavity will allow for a higher operational temperature than a bulk Nb cavity because of the higher transition temperature of MgB2 and the high thermal conductivity of Cu. Using t...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2020-10, Vol.34 (1)
Main Authors: Guo, Xin, Withanage, Wenura K., Paudel, Jay R., Eremeev, Grigory, Hannon, Fay, Rimmer, Robert, Nassiri, Alireza, Xi, Xiaoxing
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
HPCVD
MgB2 film
SRF cavity
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Summary:Magnesium diboride (MgB2) is considered a potential material for superconducting radio frequency cavities. MgB2 coated Cu cavity will allow for a higher operational temperature than a bulk Nb cavity because of the higher transition temperature of MgB2 and the high thermal conductivity of Cu. Using the hybrid physical chemical vapor deposition technique, MgB2 coatings were successfully achieved on the inner wall of 3-GHz Cu cavities. The surface and superconducting properties of the coatings were characterized using small samples on Cu plugs mounted at different locations of mock cavities. RF measurement of a MgB2 coated single-cell 3-GHz test cavity was carried out and it showed superconducting transition at 36 K. Here, the quality factor of this test cavity was lower than expected due to poor connectivity and inclusion of Mg-Cu alloy in the MgB2 coating.
ISSN:1557-1939
1557-1947