2014
DOI: 10.1109/tasc.2013.2289928
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Microwave Response of Coaxial Cavities Made of Bulk Magnesium Diboride

Abstract: Abstract-We report on the microwave properties of coaxial cavities built by using bulk MgB 2 superconductor prepared by reactive liquid Mg infiltration technology. We have assembled a homogeneous cavity by using an outer MgB 2 cylinder and an inner MgB 2 rod and a hybrid cavity by using an outer copper cylinder and the same MgB 2 rod as inner conductor. By the analysis of the resonance curves, in the different resonant modes, we have determined the microwave surface resistance R s of the MgB 2 materials as a f… Show more

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Cited by 3 publications
(3 citation statements)
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“…In a previous work, we have investigated bulk MgB 2 produced by Mg-RLI technique [12]. Because of the shorter rod used in that work, the fits of the R s ðf Þ curves were done on only three points, so the results could be inaccurate; for this reason, we have investigated a longer MgB 2 rod.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…In a previous work, we have investigated bulk MgB 2 produced by Mg-RLI technique [12]. Because of the shorter rod used in that work, the fits of the R s ðf Þ curves were done on only three points, so the results could be inaccurate; for this reason, we have investigated a longer MgB 2 rod.…”
Section: Resultsmentioning
confidence: 99%
“…The frequency dependence of R s of SC can be conveniently measured by coaxial cavity resonators, with the SC sample as inner conductor, provided that the SC rod is long enough to feed the cavity in different resonant modes [8][9][10][11]. Recently, we have done a feasibility study [12] to build coaxial cavities using bulk MgB 2 produced by reactive liquid Mg infiltration technique (Mg-RLI) [13]. The study has been carried out using a MgB 2 rod about 45 mm long; so, in the range of frequencies available with our experimental apparatus, it has been possible to investigate only three resonant modes.…”
Section: Introductionmentioning
confidence: 99%
“…Indeed, MgB 2 long coherence length is suitable for supporting the fabrication of large untextured polycrystalline samples, because the flow of high critical current density, J c , across clean grain-boundaries is not prevented by weak-link effects, even when two pellets are joined [19]. This has fostered the development of processing techniques able to produce and assemble dense MgB 2 bulk samples with almost isotropic and homogeneous J c , into complex geometries [17,[20][21][22][23]. The starting elements are cheap, non-toxic and do not include rare-earths, and the small weight density of this superconductor makes it attractive for portable applications such as space ones [24].…”
Section: Introductionmentioning
confidence: 99%