Microwave critical magnetic flux densities Bcacup to 160 mT and higher than Bc1were obtained with niobium-cavities by special surface treatments. Breakdown in this flux density region occurs by a thermal breakdown mechanism in which no superconducting critical flux density is involved. Considerable increase in Bcacmay be expected with high-Tc-superconductors such as Nb3Sn. Nb3Sn-layers were produced on niobium structures by exposing them to a saturated Sn-vapour at 1000 °C. Bcac-values up to 40 mT and surface resistances smaller than 10-6Ω were measured with TE011-cavities at 9.5 GHz.
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Hillenbrand et al. (1975) studied this question.
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