Physical Properties of Niobium and Specifications for Fabrication of Superconducting Cavities

Antoine, C.; Foley, M.; Dhanaraj, N.

doi:10.2172/1022786

Cited by 6 publications

(7 citation statements)

References 6 publications

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“…The usual method of tuning SRF cavities is simply via elastic deformation of the cavity walls, through an external forcing (such as a piezoelectric transducer, and/or a mechanical screw) [16,31]. To stay within the (low-temperature) elastic limit of niobium, the material strain should be < ∼ few×10 −3 [32]. For typical ∼ GHz cavities, this usually translates to a tunable range of a few hundred kHZ [16] -for higher cavity modes, the absolute range may be greater.…”

Section: A Srf Cavitiesmentioning

confidence: 99%

Microwave cavity searches for low-frequency axion dark matter

Lasenby

2019

Preprint

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For low-mass (frequency GHz) axions, dark matter detection experiments searching for an axion-photon-photon coupling generally have suppressed sensitivity, if they use a static background magnetic field. This geometric suppression can be alleviated by using a high-frequency oscillating background field. Here, we present a high-level sketch of such an experiment, using superconducting cavities at ∼ GHz frequencies. We discuss the physical limits on signal power arising from cavity properties, and point out cavity geometries that could circumvent some of these limitations. We also consider how backgrounds, including vibrational noise and drive signal leakage, might impact sensitivity. While practical microwave field strengths are significantly below attainable static magnetic fields, the lack of geometric suppression, and higher quality factors, may allow superconducting cavity experiments to be competitive in some regimes.1 While the sensitivity of experiments such as ABRACADABRA is not directly related to absorbed power, the gaγγ sensitivity is still suppressed by ∼ (maL), compared to its theoretical scaling at higher frequencies [2].

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Section: A Srf Cavitiesmentioning

confidence: 99%

Microwave cavity searches for low-frequency axion dark matter

Lasenby

2019

Preprint

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“…The usual method of tuning SRF cavities is simply via elastic deformation of the cavity walls, through an external forcing (such as a piezoelectric transducer, and/or a mechanical screw) [19,34]. To stay within the (lowtemperature) elastic limit of niobium, the material strain should be ≲few × 10 −3 [35]. For typical ∼GHz cavities, this usually translates to a tunable range of a few hundred kHZ [19]-for higher cavity modes, the absolute range may be greater.…”

Section: A Srf Cavitiesmentioning

confidence: 99%

Microwave cavity searches for low-frequency axion dark matter

Lasenby

2020

Phys. Rev. D

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For low-mass (frequency ≪GHz) axions, dark matter detection experiments searching for an axionphoton-photon coupling generally have suppressed sensitivity, if they use a static background magnetic field. This geometric suppression can be alleviated by using a high-frequency oscillating background field. Here, we present a high-level sketch of such an experiment, using superconducting cavities at ∼GHz frequencies. We discuss the physical limits on signal power arising from cavity properties, and point out cavity geometries that could circumvent some of these limitations. We also consider how backgrounds, including vibrational noise and drive signal leakage, might impact sensitivity. While practical microwave field strengths are significantly below attainable static magnetic fields, the lack of geometric suppression, and higher quality factors, may allow superconducting cavity experiments to be competitive in some regimes.

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“…5. Considering the operational condition at 4.2 K, there will be about a 15% rise on Young's modulus of niobium and a 7% rise for stainless steel [21,22], with a corresponding 7.5% improvement on the modal frequency expected.…”

Section: A Modal Simulationsmentioning

confidence: 99%

“…8 compare well with the predictions by Eqs. (16) and (22). The response is mainly determined by the condition in Eq.…”

Section: Transient Simulation In Two Dimensionsmentioning

confidence: 99%

Damping of vibrations in superconducting quarter wave resonators

Yang

Zvyagintsev

Laxdal

et al. 2019

Phys. Rev. Accel. Beams

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The mechanism of the damper parameters impacting on the maximum cavity detuning at a given excitation is investigated. An analytical model of the damper has been derived to predict the nonlinear response. Numerical results from simulations in ANSYS confirmed the model over a wide range of excitation. An experimental demonstration has been conducted successfully on a test bench. Online measurements taken on the ISAC-II superconducting linac at TRIUMF further verify the analytical model.

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Physical Properties of Niobium and Specifications for Fabrication of Superconducting Cavities

Cited by 6 publications

References 6 publications

Microwave cavity searches for low-frequency axion dark matter

Microwave cavity searches for low-frequency axion dark matter

Microwave cavity searches for low-frequency axion dark matter

Damping of vibrations in superconducting quarter wave resonators

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