Observation of a narrow superconducting transition at 6 GHz in crystals of Y<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></m

Rubin, D.; Green, Kevin D.; Gruschus, James M.; Kirchgessner, J.; Moffat, D.; Sears, J.; Shu, Q.S.; Schneemeyer, Lynn; Waszczak, J. V.

doi:10.1103/physrevb.38.6538

Cited by 96 publications

(13 citation statements)

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“…Another experiment also indicates that sapphire is not very dissipative at low temperatures with Q > lo8 [20]. Since the size of the sample holder can be much smaller in our case, it should not be difficult to fabricate a Josephson junction and a high-quality cavity to satisfy the overall requirement Q > lo7 when the Josephson junction is placed inside the cavity.…”

Section: Y B Xiementioning

confidence: 92%

Superconducting Josephson junction of finite capacitance in a lossless cavity: A plausible two-level system with a giant coupling constant

Xie

1998

Journal of Modern Optics

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We shall present our theoretical studies of a Josephson junction of small size in a lossless cavity. When the size of two superconductors are at order of micrometres and the Josephson coupling constant is adjusted to the correct magnitude, the Josephson junction is found to be reduced to a two-level system owing to the finite-size effect and the quenching of the low-lying singleelectronic excitations by the superconducting gap. When such a two-level system is placed in a high-quality microwave cavity, the coupling constant with a single photon g may be extremely large, for instance of the order of loR s-'. On the other hand, the damping rate of the cavity field is much less than g. Therefore, this two-level system may be used to study the quantum nature of photons and to control the dynamics of quantum fields in the framework of the Jayne-Cummings model much more easily.

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Section: Y B Xiementioning

confidence: 92%

Superconducting Josephson junction of finite capacitance in a lossless cavity: A plausible two-level system with a giant coupling constant

Xie

1998

Journal of Modern Optics

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“…A detailed description of the equipment can be seen in Ref. [9]. The sample was put on a sapphire rod located at the center of the bottom plate.…”

Section: R S At High Powermentioning

confidence: 99%

Power Dependence of the RF Surface Resistance of MgB>inf<2>/inf<Superconductor

Tajima

Findikoğlu²,

Jason³

et al.

Proceedings of the 2005 Particle Accelerator Conference

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Magnesium diboride (MgB 2 ) is a superconducting material that has a transition temperature (T c ) of ~40 K, which is ~30 K higher than niobium (Nb) that has been used for most superconducting RF cavities in the past decades. Last year, it was demonstrated that the RF surface resistance of MgB 2 can be lower than Nb at 4 K.One of the problems with other high-T c materials such as YBCO was its rapid increase in RF surface resistance with higher surface magnetic fields. Recently, we have shown that MgB 2 shows little increase in the surface resistance up to ~120 Oe, equivalent of an accelerating field of ~3 MV/m. The highest field tested was limited by available power. This result is encouraging and has made us consider fabrication of a cavity coated with MgB 2 and test it. Also, there is a potential that this material has a higher critical magnetic field that enables the cavity to run at a higher gradient than Nb cavities in addition to the possibility of operation at higher temperatures.

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“…PREVIOUS TEST CAVITIES An early superconducting 6 GHz test cavity, shown in Fig. 1(a), was built at Cornell [3]. It features loop antennae for coupling rf power to the cavity in the mode and sensing the stored energy.…”

Section: Introductionmentioning

confidence: 99%

Superconducting Test Cavity With Dielectric Concentrator for High Q, High Surface Field

Pogue

Blackburn

McIntyre

et al. 2009

IEEE Trans. Appl. Supercond.

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A superconducting test cavity and cryostat are being developed to support the testing of round wafer samples of new superconducting materials. The cavity is designed to test these samples in surface fields up to and beyond the BCS limit of Nb. The design is optimized to produce maximum surface field on the sample compared with that elsewhere in the cavity. It operates in the TE 011 mode. A dielectric hemisphere of low-loss sapphire is located just above the wafer surface and serves to concentrate the surface field. The sapphire is cooled by a column of superfluid He, with sufficient heat transport to maintain high Q throughout the rf pulse. It should be possible to test a sample to twice the BCS limit of Nb while measuring the rf surface resistance of the sample.

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Observation of a narrow superconducting transition at 6 GHz in crystals of YBa2Cu3

Cited by 96 publications

References 5 publications

Superconducting Josephson junction of finite capacitance in a lossless cavity: A plausible two-level system with a giant coupling constant

Superconducting Josephson junction of finite capacitance in a lossless cavity: A plausible two-level system with a giant coupling constant

Power Dependence of the RF Surface Resistance of MgB>inf<2>/inf<Superconductor

Superconducting Test Cavity With Dielectric Concentrator for High Q, High Surface Field

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Observation of a narrow superconducting transition at 6 GHz in crystals of YBa2Cu3

Cited by 96 publications

References 5 publications

Superconducting Josephson junction of finite capacitance in a lossless cavity: A plausible two-level system with a giant coupling constant

Superconducting Josephson junction of finite capacitance in a lossless cavity: A plausible two-level system with a giant coupling constant

Power Dependence of the RF Surface Resistance of MgB&gt;inf&lt;2&gt;/inf&lt;Superconductor

Superconducting Test Cavity With Dielectric Concentrator for High Q, High Surface Field

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Power Dependence of the RF Surface Resistance of MgB>inf<2>/inf<Superconductor