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rf surface resistance measurements of binary and ternary niobium compounds (1995)

Gemme, G. ; Fabbricatore, P. ; Musenich, R. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 77 (1995), S. 257-264

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The superconducting properties of binary and ternary niobium compounds for rf applications are investigated. The materials under study are niobium nitride (NbN), niobium-titanium nitride (NbTiN), and niobium tin (Nb3Sn). Preparation techniques of the compounds are discussed. NbN and NbTiN are obtained by thermal reaction of bulk Nb in nitrogen atmosphere. Nb3Sn has been obtained using a technique originally developed for high-field magnet fabrication and modified to be applied to rf cavity production. The experimental apparatus and measurement technique are described. In particular the raw experimental data have been carefully analyzed to obtain important informations on fundamental material parameters. The effect of field penetration in the superconductor and the influence on the experimental results of the normal metallic substrate on which the superconductor is grown is also considered. The measurements show that NbN and Nb3Sn are effectively potentially good materials for rf applications due to their low theoretical BCS surface resistance. So far the results obtained with NbTiN are more difficult to interpret because the quality of the material did not allow sufficiently accurate collection of data. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.359386

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RF measurements on a TE011 YBCO cavity at 8 GHz (1995)

Zhang, B. ; Fabbricatore, P. ; Gemme, G. ; [et al.]

Springer

Journal of superconductivity 8 (1995), S. 753-757

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ISSN: 1572-9605

Keywords: YBCO ; surface resistance ; penetration depth

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract In the present work a cavity fully coated with an YBCO thick film was fabricated using an improved electrophoretic deposition technology with a special attempt to avoid the possible contamination of the superconducting powder during the milling process in the suspension preparation. A microwave experimental set-up was constructed to measure the rf behavior of the cavity in a wide temperature range. The loaded quality factorQ 1 and the shift of the resonant frequency vs. the temperature at various rf magnetic fields have been measured. Furthermore, the surface resistance and the penetration depth determined from the measurements were compared with the numerical calculation in the framework of BCS theory, showing good agreement with the theoretical predictions.