A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz

A 400-MHz niobium quadrupole resonator has been manufactured to study the rf properties of superconducting bulk and thin film samples at low temperatures. We describe the apparatus, i.e. the construction of the resonator, field calculations with MAFIA, and the experimental procedure. In first valida...

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Detalles Bibliográficos
Autores principales: Mahner, E, Calatroni, S, Chiaveri, Enrico, Häbel, E, Tessier, J M
Lenguaje:eng
Publicado: 2003
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1063/1.1578157
http://cds.cern.ch/record/611593
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author Mahner, E
Calatroni, S
Chiaveri, Enrico
Häbel, E
Tessier, J M
author_facet Mahner, E
Calatroni, S
Chiaveri, Enrico
Häbel, E
Tessier, J M
author_sort Mahner, E
collection CERN
description A 400-MHz niobium quadrupole resonator has been manufactured to study the rf properties of superconducting bulk and thin film samples at low temperatures. We describe the apparatus, i.e. the construction of the resonator, field calculations with MAFIA, and the experimental procedure. In first validation tests the surface resistance Rs of a reactor-grade bulk niobium sample as a function of temperature and applied rf field has been investigated by using a calorimetric "rf-dc-compensation" method. A critical temperature Tc = 9.15 ± 0.02 K, a thermal conductivity λ (4.2 K) = 6.9 ± 0.7 W/mK, a residual resistance Rres = 19.0 ± 0.3 nΩ and a superconducting energy gap of ∆/kBTc = 1.82 ± 0.01 have been measured. At 4.2 K we achieved a calorimetric detection limit for Rs of 0.16 nΩ at a peak field of 25 mT.
id cern-611593
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
record_format invenio
spelling cern-6115932019-09-30T06:29:59Zdoi:10.1063/1.1578157http://cds.cern.ch/record/611593engMahner, ECalatroni, SChiaveri, EnricoHäbel, ETessier, J MA New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHzAccelerators and Storage RingsA 400-MHz niobium quadrupole resonator has been manufactured to study the rf properties of superconducting bulk and thin film samples at low temperatures. We describe the apparatus, i.e. the construction of the resonator, field calculations with MAFIA, and the experimental procedure. In first validation tests the surface resistance Rs of a reactor-grade bulk niobium sample as a function of temperature and applied rf field has been investigated by using a calorimetric "rf-dc-compensation" method. A critical temperature Tc = 9.15 ± 0.02 K, a thermal conductivity λ (4.2 K) = 6.9 ± 0.7 W/mK, a residual resistance Rres = 19.0 ± 0.3 nΩ and a superconducting energy gap of ∆/kBTc = 1.82 ± 0.01 have been measured. At 4.2 K we achieved a calorimetric detection limit for Rs of 0.16 nΩ at a peak field of 25 mT.CERN-AT-2003-001-VACoai:cds.cern.ch:6115932003-04-04
spellingShingle Accelerators and Storage Rings
Mahner, E
Calatroni, S
Chiaveri, Enrico
Häbel, E
Tessier, J M
A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz
title A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz
title_full A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz
title_fullStr A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz
title_full_unstemmed A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz
title_short A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz
title_sort new instrument to measure the surface resistance of superconducting samples at 400 mhz
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1063/1.1578157
http://cds.cern.ch/record/611593
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