β Scribed by Riccardo Musenich; Maria J. Durante; Gianluca Gemme; Renzo Parodi; Pasquale Fabbricatore; Bi Zhang
No coin nor oath required. For personal study only.
Cylindrical and hemispherical copper cavities for the rf (about 10 GHz) characterisation of superconducting material samples have been developed. The cavities, indirectly cooled, have removable top plates to host suitable samples. The whole devices work under vacuum and are cooled by conduction through the copper immersed in liquid helium. Measurements of surface resistance and frequency shift of Nb3Sn samples have been performed as function of temperature. The measurement sensitivity, related to the Q measurement sensitivity and to the copper rf surface resistance as well as to the ratio between the geometry factor of both the sample and the cavity, is discussed.
π SIMILAR VOLUMES
A systematic study is presented on the superconductivity (SC) parameters of the ultrapure niobium used for the fabrication of the nine-cell 1.3 GHz cavities for the linear collider project TESLA. Cylindrical Nb samples have been subjected to the same surface treatments that are applied to the TESLA