Involvement of hydrogen-vacancy complexes in the baking effect of niobium cavities
May 1, 2010
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Abstract: (APS)
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).- 84.40.-x
- 74.70.Ad
- 78.70.Bj
- 74.62.Dh
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