Involvement of hydrogen-vacancy complexes in the baking effect of niobium cavities
B. Visentin, M. F. Barthe, V. Moineau and 1 more
Physical Review Special Topics. Accelerators and Beams · 2010
doi:10.1103/physrevstab.13.052002 (opens in a new tab)
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Abstract
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).
Abstract licence: CC BY
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