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2010
ACL
doi
B.Visentin, M.F.Barthe, V.Moineau, P.Desgardin
,
'Involvement of hydrogen-vacancy complexes in the baking effect of niobium cavities'
, Phys. Rev. ST Accel. Beams 13 052002 (2010) doi:
10.1103/physrevstab.13.052002
Baking is necessary to improve high accelerating gradient performances of superconducting niobium cavities. Ten years after this discovery in 1998, the understanding of this effect still resists a lot of theoretical explanations. For the first time, positron annihilation spectroscopy performed on niobium samples reveals the increase after baking of positrons trapped under the Nb surface. Presence of hydrogen-vacancy complexes and their dissociation by baking could both explain rf losses observed at high fields (Q drop) and its cure (baking effect).